6,143 results match your criteria Geochemical Transactions [Journal]


A nanocrystalline monoclinic CaCO precursor of metastable aragonite.

Sci Adv 2018 Dec 12;4(12):eaau6178. Epub 2018 Dec 12.

Institute of Geology, University of Innsbruck, Innrain 52, Innsbruck 6020, Austria.

Despite its thermodynamical metastability at near-surface conditions, aragonite is widespread in marine and terrestrial sediments. It abundantly forms in living organisms, and its abiotic formation is favored in waters of a Mg/Ca ratio > 1.5. Read More

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December 2018

Extreme Geochemical Conditions and Dispersal Limitation Retard Primary Succession of Microbial Communities in Gold Tailings.

Front Microbiol 2018 28;9:2785. Epub 2018 Nov 28.

School of Earth and Environmental Sciences, The University of Queensland, St Lucia, QLD, Australia.

Microbial community succession in tailings materials is poorly understood at present, and likely to be substantially different from similar processes in natural primary successional environments due to the unusual geochemical properties of tailings and the isolated design of tailings storage facilities. This is the first study to evaluate processes of primary succession in microbial communities colonizing unamended tailings, and compare the relative importance of stochastic (predominantly dust-borne dispersal) and deterministic (strong selection pressures from extreme geochemical properties) processes in governing community assembly rates and trajectories to those observed in natural environments. Dispersal-based recruitment required > 6 months to shift microbial community composition in unamended, field-weathered gold tailings; and in the absence of targeted inoculants, recruitment was dominated by salt- and alkali-tolerant species. Read More

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November 2018

The Origin of Carbonate Veins Within the Sedimentary Cover and Igneous Rocks of the Cocos Ridge: Results From IODP Hole U1414A.

Geochem Geophys Geosyst 2018 Oct 11;19(10):3721-3738. Epub 2018 Oct 11.

Ocean and Earth Science, National Oceanography Centre Southampton University of Southampton Southampton England, UK.

Carbonate veins in the igneous basement and in the lithified sedimentary cover of the Cocos Ridge at International Ocean Discovery Program (IODP) Hole 344-U1414A reveal the hydrologic system and fluid-rock interactions. IODP Hole 344-U1414A was drilled on the northern flank of the Cocos Ridge and is situated 1 km seaward from the Middle America Trench offshore Costa Rica. Isotopic and elemental compositions were analyzed to constrain the fluid source of the carbonate veins and to reveal the thermal history of Hole 344-U1414A. Read More

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October 2018
1 Read

The Broad Habitat Spectrum of the CL500-11 Lineage (Phylum Chloroflexi), a Dominant Bacterioplankton in Oxygenated Hypolimnia of Deep Freshwater Lakes.

Front Microbiol 2018 27;9:2891. Epub 2018 Nov 27.

Center for Ecological Research, Kyoto University, Otsu, Japan.

CL500-11 (phylum ) is one of the most ubiquitous and abundant bacterioplankton lineages in deep freshwater lakes inhabiting the oxygenated hypolimnion. While metagenomics predicted possible eco-physiological characteristics of this uncultured lineage, no consensus on their ecology has so far been reached, partly because their niche is not clearly understood due to a limited number of quantitative field observations. This study investigated the abundance and distribution of CL500-11 in seven deep perialpine lakes using catalyzed reporter deposition-fluorescence hybridization (CARD-FISH). Read More

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November 2018

Characteristics of sediment affecting monomethylmercury accumulation in benthic fish of the Mekong Delta.

Environ Toxicol Chem 2018 Dec 7. Epub 2018 Dec 7.

School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science & Technology (GIST), Gwangju 61005, Republic of Korea.

The Mekong River Delta is a flat, low-lying area formed by a dense network of main tributaries of the Tien River and the Hau River, providing a nourishing habitat for aquatic organisms. A sediment survey of the total mercury (Hg), monomethylmercury (MMHg), and geochemical variables was carried out from the coast to 131 km upriver to establish an overview of the environmental factors affecting the bioaccumulation of Hg and MMHg in delta fish. The survey results revealed that the total Hg (12-90 ng g ) and MMHg (0. Read More

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December 2018

Density functional theory calculations and thermodynamic analysis of bridgmanite surface structure.

Phys Chem Chem Phys 2018 Dec 7. Epub 2018 Dec 7.

Faculty of Physical Sciences, University of Iceland, 107 Reykjavík, Iceland and Dept. of Energy Conversion and Storage, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.

Bridgmanite, a high temperature and pressure form of MgSiO3, is believed to be Earth's most abundant mineral and responsible for the observed seismic anisotropy in the mantle. Little is known about surfaces of bridgmanite but knowledge of the most stable surface terminations is important for understanding various geochemical processes as well as likely slip planes. A density functional theory based thermodynamic approach is used here to establish the range of stability of bridgmanite as well as possible termination structures of the (001), (010), (100) and (011) surfaces as a function of the chemical potential of oxygen and magnesium. Read More

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December 2018

Influence of CO Degassing on the Microbial Community in a Dry Mofette Field in Hartoušov, Czech Republic (Western Eger Rift).

Front Microbiol 2018 21;9:2787. Epub 2018 Nov 21.

GFZ German Research Centre for Geosciences, Section Geomicrobiology, Potsdam, Germany.

The Cheb Basin (CZ) is a shallow Neogene intracontinental basin filled with fluvial and lacustrine sediments that is located in the western part of the Eger Rift. The basin is situated in a seismically active area and is characterized by diffuse degassing of mantle-derived CO in mofette fields. The Hartoušov mofette field shows a daily CO flux of 23-97 tons of CO released over an area of 0. Read More

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November 2018

Depth and Dissolved Organic Carbon Shape Microbial Communities in Surface Influenced but Not Ancient Saline Terrestrial Aquifers.

Front Microbiol 2018 27;9:2880. Epub 2018 Nov 27.

Centre for Ecology and Evolution in Microbial Model Systems, Linnaeus University, Kalmar, Sweden.

The continental deep biosphere is suggested to contain a substantial fraction of the earth's total biomass and microorganisms inhabiting this environment likely have a substantial impact on biogeochemical cycles. However, the deep microbial community is still largely unknown and can be influenced by parameters such as temperature, pressure, water residence times, and chemistry of the waters. In this study, 21 boreholes representing a range of deep continental groundwaters from the Äspö Hard Rock Laboratory were subjected to high-throughput 16S rRNA gene sequencing to characterize how the different water types influence the microbial communities. Read More

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November 2018

In-situ incubation of a coral patch for community-scale assessment of metabolic and chemical processes on a reef slope.

PeerJ 2018 3;6:e5966. Epub 2018 Dec 3.

Department of Ocean Sciences, NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University, Den Hoorn, Noord-Holland, The Netherlands.

Anthropogenic pressures threaten the health of coral reefs globally. Some of these pressures directly affect coral functioning, while others are indirect, for example by promoting the capacity of bioeroders to dissolve coral aragonite. To assess the coral reef status, it is necessary to validate community-scale measurements of metabolic and geochemical processes in the field, by determining fluxes from enclosed coral reef patches. Read More

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December 2018

Dietary versatility of Early Pleistocene hominins.

Proc Natl Acad Sci U S A 2018 Dec 10. Epub 2018 Dec 10.

Senckenberg Biodiversity and Climate Research Centre, 60325 Frankfurt, Germany.

New geochemical data from the Malawi Rift (Chiwondo Beds, Karonga Basin) fill a major spatial gap in our knowledge of hominin adaptations on a continental scale. Oxygen (δO), carbon (δC), and clumped (Δ) isotope data on paleosols, hominins, and selected fauna elucidate an unexpected diversity in the Pleistocene hominin diet in the various habitats of the East African Rift System (EARS). Food sources of early and thriving in relatively cool and wet wooded savanna ecosystems along the western shore of paleolake Malawi contained a large fraction of C plant material. Read More

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December 2018

Vanadium and chromium-contaminated soil remediation using VFAs derived from food waste as soil washing agents: A case study.

J Environ Manage 2018 Dec 6;232:895-901. Epub 2018 Dec 6.

School of Environment, Tsinghua University, Beijing 10084, China.

Food waste (FW) is environmentally unfriendly and decays easily under ambient conditions. Vanadium (V) and chromium (Cr) contamination in soils has become an increasing concern due to risks to human health and environmental conservation. Volatile fatty acids (VFAs) derived from FW was applied as soil washing agent to treat V and Cr-contaminated soil collected from a former V smelter site in this work. Read More

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December 2018

Nonnegative tensor factorization for contaminant source identification.

J Contam Hydrol 2018 Dec 4. Epub 2018 Dec 4.

Computational Earth Science Group, Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, USA.

Unsupervised Machine Learning (ML) is becoming increasingly popular for solving various types of data analytics problems including feature extraction, blind source separation, exploratory analyses, model diagnostics, etc. Here, we have developed a new unsupervised ML method based on Nonnegative Tensor Factorization (NTF) for identification of the original groundwater types (including contaminant sources) present in geochemical mixtures observed in an aquifer. Frequently, groundwater types with different geochemical signatures are related to different background and/or contamination sources. Read More

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December 2018

Effects of effluent organic matters on endocrine disrupting chemical removal by ultrafiltration and ozonation in synthetic secondary effluent.

J Environ Sci (China) 2019 Feb 29;76:57-64. Epub 2018 Mar 29.

Civil Engineering Department, North China Institute of Aerospace Engineering, Langfang 065000, China.

Endocrine disrupting chemicals (EDCs) in the secondary effluent discharged from wastewater treatment plants are of great concern when water reuse is intended. Ozonation and ultrafiltration (UF) are powerful technologies reported to eliminate EDCs. Due to the importance of effluent organic matters (EfOMs) in secondary effluent, the effects of three kinds of EfOM on the treatment of five EDCs using ozonation and UF were investigated. Read More

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February 2019
1 Read

Geochemical and Isotope Study of Trichloroethene Degradation in a Zero-Valent Iron Permeable Reactive Barrier: A Twenty-Two-Year Performance Evaluation.

Environ Sci Technol 2018 Dec 9. Epub 2018 Dec 9.

This study provides a twenty-two-year record of in situ degradation of chlorinated organic compounds by a granular iron permeable reactive barrier (PRB). Groundwater concentrations of trichloroethene (TCE) entering the PRB were as high as 10,670 µg/L. Treatment efficiency ranged from 81 to >99% and TCE concentrations from <1 µg/L to 165 µg/L were detected within and hydraulically down-gradient of the PRB. Read More

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December 2018

Patatin-like lipolytic acyl hydrolases and galactolipid metabolism in marine diatoms of the genus Pseudo-nitzschia.

Biochim Biophys Acta Mol Cell Biol Lipids 2018 Dec 3. Epub 2018 Dec 3.

CNR-Istituto di Chimica Biomolecolare, Via Campi Flegrei 34, 80078, Pozzuoli, Naples, Italy. Electronic address:

Diatoms are eukaryotic microalgae that play a pivotal role in biological and geochemical marine cycles. These microorganisms are at the basis of the trophic chain and their lipids are essential components (e.g. Read More

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December 2018
2 Reads

Distribution characteristics, sources and ecological risk of antimony in the surface sediments of Changjiang Estuary and the adjacent sea, East China.

Mar Pollut Bull 2018 Dec 29;137:474-480. Epub 2018 Oct 29.

National Engineering and Technology Research Center for Development & Utilization of Phosphorous Resources, Wuhan Institute of Technology, Wuhai, Hubei 430073, China.

The distribution characteristics, sources and ecological risk of antimony (Sb) in the surface sediments of Changjiang Estuary and the adjacent sea were studied. Sb concentrations ranged from 0.320 to 0. Read More

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December 2018
2 Reads

Use of Tisbe biminiensis nauplii in ecotoxicological tests and geochemical analyses to assess the sediment quality of a tropical urban estuary in northeastern Brazil.

Mar Pollut Bull 2018 Dec 5;137:45-55. Epub 2018 Oct 5.

Laboratório de Hidrodinâmica Costeira, Departamento de Oceanografi, Universidade Federal de Pernambuco, Av. Arquitetura, s/n, Cidade Universitária, Recife, Pernambuco, 50740-550, Brazil.

An approach pooling geochemical analyses and ecotoxicological tests has been applied to assess the sediment quality of the Capibaribe River Estuary, Brazil. Toxicity tests were performed to compare a well-established, labor-intensive protocol using ovigerous females to a new, easier and faster protocol using nauplii of the epibenthic marine copepod Tisbe biminiensis. The endpoints of the nauplii toxicity test were comparable to those of the female test. Read More

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December 2018

First report of geochemical fractionation distribution, bioavailability and risk assessment of potentially toxic inorganic elements in sediments of coral reef Islands of the Persian Gulf, Iran.

Mar Pollut Bull 2018 Dec 12;137:185-197. Epub 2018 Oct 12.

Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy.

Metal contamination is a serious environmental concern in the Middle East. Herein, geochemical fractionation distribution and potential sources of thirteen metals (Fe, Al, Mn, Zn, Cu, Co, Cr, Ni, V, As, Hg, Pb and Cd) were investigated in sediments from ten coral reef Islands in the Persian Gulf, Iran. To properly assess availability and mobility of elements, enrichment factor (EF), pollution load index (PLI), pollution index (PI), contamination index (CI), sediment pollution index (SPI) and ecological risk assessment were provided. Read More

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December 2018

Microbial diversity and biosignatures of amorphous silica deposits in orthoquartzite caves.

Sci Rep 2018 Dec 4;8(1):17569. Epub 2018 Dec 4.

Department of Biological Geological and Environmental Sciences, University of Bologna, 40126, Bologna, Italy.

Chemical mobility of crystalline and amorphous SiO plays a fundamental role in several geochemical and biological processes, with silicate minerals being the most abundant components of the Earth's crust. Although the oldest evidences of life on Earth are fossilized in microcrystalline silica deposits, little is known about the functional role that bacteria can exert on silica mobility at non-thermal and neutral pH conditions. Here, a microbial influence on silica mobilization event occurring in the Earth's largest orthoquartzite cave is described. Read More

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December 2018
1 Read

Influence of wood ash pre-treatment on leaching behaviour, liming and fertilising potential.

Waste Manag 2019 Jan 13;83:113-122. Epub 2018 Nov 13.

Technical University of Denmark, Department of Environmental Engineering, Building 113, Miljoevej, 2800 Kgs. Lyngby, Denmark.

In Denmark, increasing amounts of woody biomass are being used for the production of renewable energy, resulting in more wood ashes being generated. While these materials have been mainly landfilled, wood ashes may also be utilised for fertilizing and liming purposes on top of soils. Pre-treatments involving hardening or granulation may be carried out prior to soil application. Read More

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January 2019
3 Reads

How significant is atmospheric metal contamination from mining activity adjacent to the Tasmanian Wilderness World Heritage Area? A spatial analysis of metal concentrations using air trajectories models.

Sci Total Environ 2018 Nov 17;656:250-260. Epub 2018 Nov 17.

Archaeology and Natural History, School of Culture, History and Language, Australian National University, Coombs Bld. 9, 2601 Acton, Canberra - ACT, Australia.

This study investigated metal contamination from historical mining in lakes in the Tasmanian Wilderness World Heritage Area (TWWHA) and surrounding region. The largest increase in sedimentation and metal contamination occurred ca. 1930 when open-cut mining commenced and new mining technology was introduced into the region. Read More

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November 2018
1 Read

Lung Cancer Risk by Geologic Coal Deposits: A Case-Control Study of Female Never-smokers from Xuanwei and Fuyuan, China.

Int J Cancer 2018 Dec 3. Epub 2018 Dec 3.

Occupational and Environmental Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Rockville, MD, USA.

Coal types vary around the world because of geochemical differences in their source deposits; however, the influence of coal emissions from different deposits on human health remains unexplored. To address this issue, we conducted the first study of the relationship between coal use from various deposits and lung cancer risk in Xuanwei and Fuyuan, counties in China where lung cancer rates are among the highest in the world among female never-smokers due to use of bituminous ("smoky") coal for heating and cooking. We conducted a population-based case-control study of 1031 lung cancer cases and 493 controls among never-smoking women in Xuanwei and Fuyuan. Read More

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December 2018
1 Read

Petrological and geochemical (major-, trace-, and rare earth element) data of the Triassic El Tranquilo Group, Deseado Massif, Patagonia, Argentina.

Authors:
Uwe Jenchen

Data Brief 2018 Dec 16;21:1970-2014. Epub 2018 Nov 16.

Uwe Jenchen, Universidad Autónoma de Nuevo León, Facultad de Ciencias de la Tierra, Carretera a Cerro Prieto, km. 8, C.P. 67700 Linares, Nuevo León, México.

From samples of the Middle to Late Triassic El Tranquilo Group (El Tranquilo anticline, Deseado Massif, Patagonia) petrographic (qualitative and modal) analyses and geochemical analyses (major, trace elements, and rare earth elements (REEs)) of 80 samples were carried out. The data presented here contain a broad overview of photomicrography, recalculated modal point-count data, geochemical raw data, and simple statistics of selected geochemical parameters. The data presented in this article are interpreted and discussed in the research article entitled "Petrography and geochemistry of the Triassic El Tranquilo Group, Deseado Massif, Patagonia, Argentina: Implications for provenance and tectonic setting" (Jenchen, 2018). Read More

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December 2018

Oxygenated Mesoproterozoic lake revealed through magnetic mineralogy.

Proc Natl Acad Sci U S A 2018 Dec 3. Epub 2018 Dec 3.

Department of Geological Sciences, Stanford University, Stanford, CA 94305.

Terrestrial environments have been suggested as an oxic haven for eukaryotic life and diversification during portions of the Proterozoic Eon when the ocean was dominantly anoxic. However, iron speciation and Fe/Al data from the ca. 1. Read More

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December 2018
7 Reads

Geostatistical multimodel approach for the assessment of the spatial distribution of natural background concentrations in large-scale groundwater bodies.

Water Res 2018 Sep 29;149:522-532. Epub 2018 Sep 29.

Politecnico di Milano, Dipartimento di Ingegneria Civile e Ambientale, Piazza L. Da Vinci 32, 20133, Milano, Italy; University of Arizona, Department of Hydrology and Atmospheric Sciences, 85721, Tucson, AZ, USA.

Quantification of the (spatially distributed) natural contributions to the chemical signature of groundwater resources is an emerging issue in the context of competitive groundwater uses as well as water regulation and management frameworks. Here, we illustrate a geostatistically-based approach for the characterization of spatially variable Natural Background Levels (NBLs) of target chemical species in large-scale groundwater bodies yielding evaluations of local probabilities of exceedance of a given threshold concentration. The approach is exemplified by considering three selected groundwater bodies and focusing on the evaluation of NBLs of ammonium and arsenic, as detected from extensive time series of concentrations collected at monitoring boreholes. Read More

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September 2018

Regional fresh snowfall microbiology and chemistry are driven by geography in storm-tracked events, Colorado, USA.

PeerJ 2018 21;6:e5961. Epub 2018 Nov 21.

Civil and Environmental Engineering, Colorado School of Mines, Golden, CO, USA.

Snowfall is a global phenomenon highly integrated with hydrology and ecology. Forays into studying bioaerosols and their dependence on aeolian movement are largely constrained to either precipitation-independent analyses or in silico models. Though snowpack and glacial microbiological studies have been conducted, little is known about the biological component of meteoric snow. Read More

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November 2018
1 Read

Members of and Influence System Biogeochemistry During Early Production of Hydraulically Fractured Natural Gas Wells in the Appalachian Basin.

Front Microbiol 2018 15;9:2646. Epub 2018 Nov 15.

Department of Civil, Environmental, and Geodetic Engineering, The Ohio State University, Columbus, OH, United States.

Hydraulic fracturing is the prevailing method for enhancing recovery of hydrocarbon resources from unconventional shale formations, yet little is understood regarding the microbial impact on biogeochemical cycling in natural-gas wells. Although the metabolisms of certain fermentative bacteria and methanogenic archaea that dominate in later produced fluids have been well studied, few details have been reported on microorganisms prevelant during the early flowback period, when oxygen and other surface-derived oxyanions and nutrients become depleted. Here, we report the isolation, genomic and phenotypic characterization of and bacterial species from natural-gas wells in the Utica-Point Pleasant and Marcellus Formations coupled to supporting geochemical and metagenomic analyses of produced fluid samples. Read More

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November 2018

Production of extracellular reactive oxygen species by phytoplankton: past and future directions.

J Plankton Res 2018 Nov 26;40(6):655-666. Epub 2018 Sep 26.

Department of Marine Sciences, Skidaway Institute of Oceanography, University of Georgia, Savannah, GA, USA.

In aquatic environments, phytoplankton represent a major source of reactive oxygen species (ROS) such as superoxide and hydrogen peroxide. Many phytoplankton taxa also produce extracellular ROS under optimal growth conditions in culture. However, the physiological purpose of extracellular ROS production by phytoplankton and its wider significance to ecosystem-scale trophic interactions and biogeochemistry remain unclear. Read More

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November 2018

High temperature/pressure MAS-NMR for the study of dynamic processes in mixed phase systems.

Magn Reson Imaging 2018 Oct 25. Epub 2018 Oct 25.

Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99354, United States. Electronic address:

A new MAS-NMR rotor (the WHiMS rotor) has been developed which can reach pressures of 400 bar at 20 °C or 225 bar at 250 °C. These rotors are ideal for mixed phase systems such as a reaction using a solid catalyst with a liquid/supercritical solvent topped with high pressure gas in the head space. After solid and liquid portions of the sample are loaded, the rotor is capped with an o-ring equipped polymer bushing that snaps into a mating groove in the rotor. Read More

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October 2018

Salino-alkaline lime of anthropogenic origin a reservoir of diverse microbial communities.

Sci Total Environ 2018 Nov 22;655:842-854. Epub 2018 Nov 22.

Department of Environmental Microbiology and Biotechnology, Faculty of Biology and Environmental Protection, Nicolaus Copernicus University in Toruń, Lwowska 1, 87-100 Toruń, Poland.

This paper presents study on the microbiome of a unique extreme environment - saline and alkaline lime, a by-product of soda ash and table salt production in Janikowo, central Poland. High-throughput 16S rDNA amplicon sequencing was used to reveal the structure of bacterial and archaeal communities in the lime samples, taken from repository ponds differing in salinity (2.3-25. Read More

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November 2018
4 Reads

The large-scale distribution of Cu and Zn in sub- and topsoil: Separating topsoil bioaccumulation and natural matrix effects from diffuse and regional contamination.

Sci Total Environ 2018 Nov 17;655:730-740. Epub 2018 Nov 17.

Faculty of Life Science, University of Vienna, Althanstr. 14, A-1090, Vienna, Austria.

A realistic estimate of diffuse contamination requires to recognize and assess the dominant natural and anthropogenic element sources. For eight large-scale geochemical surveys, the relations between geogenic, anthropogenic and biogenic Cu and Zn sources are estimated by comparing the cumulative distribution functions (CDF) of the elements in top- and subsoil using cumulative probability (CP) diagrams. Strong local contamination distorts the high-concentration end of the distribution function considerably in topsoil. Read More

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November 2018
6 Reads

The natural activation ability of subsurface media to promote in-situ chemical oxidation of 1,4-dioxane.

Water Res 2018 Nov 14;149:386-393. Epub 2018 Nov 14.

Hydrology and Atmospheric Sciences Department, School of Earth and Environmental Sciences, University of Arizona, 429 Shantz Building, Tucson, AZ, 85721, United States; Soil, Water and Environmental Science Department, School of Earth and Environmental Sciences, University of Arizona, 429 Shantz Building, Tucson, AZ, 85721, United States. Electronic address:

The ability of soils and sediments to promote in-situ activation of persulfate and persulfate combined with hydrogen peroxide was investigated for treatment of 1,4-dioxane (dioxane). Experiments were conducted with both batch-reactor and column systems to examine reaction rates and activation mechanisms. Four soils and aquifer sediments were used. Read More

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November 2018
1 Read

Diversity and predictive metabolic pathways of the prokaryotic microbial community along a groundwater salinity gradient of the Pearl River Delta, China.

Sci Rep 2018 Nov 23;8(1):17317. Epub 2018 Nov 23.

Department of Ecology, Jinan University, Guangzhou, 510632, Guangdong, China.

Almost half of the groundwater in the Pearl River Delta (PRD) contains salt water originally derived from paleo-seawater due to the Holocene transgression, which then generates intense physicochemical gradients in the mixing zone between freshwater and saltwater. Although some studies have been conducted on the hydrological and geochemical characteristics of groundwater in the PRD to monitor the intrusion of seawater, little attention has been paid to the microbial community of this particular region. In this study, we implemented a high-throughput sequencing analysis to characterize the microbial communities along a salinity gradient in the PRD aquifer, China. Read More

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November 2018
7 Reads

Extreme enrichment of arsenic and rare earth elements in acid mine drainage: Case study of Wiśniówka mining area (south-central Poland).

Environ Pollut 2019 Jan 29;244:898-906. Epub 2018 Oct 29.

Geochemistry and the Environment Div., Institute of Chemistry, Jan Kochanowski University, 15G Świętokrzyska St, 25-406, Kielce, Poland.

The Wiśniówka rock strip mining area (south-central Poland) with quartzite quarries, acid water bodies and tailings piles is one of the most unique acid mine drainage (AMD) sites throughout the world. This is due to the occurrence of enormous amounts of pyrite unknown in sedimentary formations worldwide. Of the two mineralization zones, one that is the most abundant in arsenical pyrite occurs in the lowermost Upper Cambrian formation of the Podwiśniówka quarry. Read More

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January 2019

A novel approach of combining isotopic and geochemical signatures to differentiate the sources of sediments and particulate nutrients from different land uses.

Sci Total Environ 2018 Nov 7;655:129-140. Epub 2018 Nov 7.

School of Environment and Science, Griffith University, Brisbane, Queensland 4111, Australia.

Determining the source of sediments and associated nutrients from terrestrial to aquatic environments is critical for managing the detrimental impacts of soil erosion and loss of nutrients from terrestrial into aquatic environment. However, tracing the source of particulate nutrients from different land uses has not been adequately carried out due to methodological difficulties in separating sources, particularly in the Great Barrier Reef (GBR) catchment. The objective of this study was to develop a method to differentiate the sources of particulate nutrients from soils collected from different land uses (combination of beef and dairy grazing, sugarcane, forest and banana) using both geochemical and isotopic signatures. Read More

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November 2018
2 Reads

The timing and widespread effects of the largest Holocene volcanic eruption in Antarctica.

Sci Rep 2018 Nov 22;8(1):17279. Epub 2018 Nov 22.

Department of Geography, Universitat de Barcelona, 08001, Barcelona, Spain.

The caldera collapse of Deception Island Volcano, Antarctica, was comparable in scale to some of the largest eruptions on Earth over the last several millennia. Despite its magnitude and potential for far-reaching environmental effects, the age of this event has never been established, with estimates ranging from the late Pleistocene to 3370 years before present. Here we analyse nearby lake sediments in which we identify a singular event produced by Deception Island's caldera collapse that occurred 3980 ± 125 calibrated years before present. Read More

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November 2018
16 Reads

Delineation of contaminant sources and denitrification using isotopes of nitrate near a wastewater treatment plant in peri-urban settings.

Sci Total Environ 2019 Feb 11;651(Pt 2):2701-2711. Epub 2018 Oct 11.

School of Engineering, RMIT University, 376-392 Swanston Street, Melbourne, Victoria 3001, Australia. Electronic address:

Distinguishing sources of groundwater contamination in regions with multiple potential sources can be challenging using conventional markers. In this study, isotopes of nitrate (δN and δO) were examined in conjunction with other hydrochemical parameters to better distinguish sources of groundwater contamination, where intensive agriculture occurs adjacent to a wastewater treatment plant (WWTP). High nitrate concentrations were found in groundwater both within the WWTP site and surrounding market garden farms (maximum of 99 mg/L and 78 mg/L nitrate as N, respectively). Read More

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February 2019

First report on global fallout U and uranium atom ratios in soils from Hunan Province, China.

J Environ Radioact 2018 Nov 18;197:1-8. Epub 2018 Nov 18.

Beijing Engineering Research Center of Radiographic Techniques and Equipment, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China. Electronic address:

More nuclear power plants continue to be built in China. Due to its long half-life, radiotoxicity and potential application as an environmental tracer, U is one of the most important artificial radionuclides deserving more study since activity data are important for risk assessment. However, the ultra-trace activity of U and its dilution by natural uranium isotopes make it difficult to distinguish its sources and there are only limited global fallout U data for present in Chinese environmental samples. Read More

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November 2018
3 Reads

Metatranscriptomes Reveal That All Three Domains of Life Are Active but Are Dominated by Bacteria in the Fennoscandian Crystalline Granitic Continental Deep Biosphere.

MBio 2018 Nov 20;9(6). Epub 2018 Nov 20.

Centre for Ecology and Evolution in Microbial Model Systems (EEMiS), Linnaeus University, Kalmar, Sweden.

The continental subsurface is suggested to contain a significant part of the earth's total biomass. However, due to the difficulty of sampling, the deep subsurface is still one of the least understood ecosystems. Therefore, microorganisms inhabiting this environment might profoundly influence the global nutrient and energy cycles. Read More

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November 2018

Hydrogeological responses in tropical mountainous springs.

Isotopes Environ Health Stud 2018 Nov 20:1-16. Epub 2018 Nov 20.

a Stable Isotope Research Group, Chemistry School , Universidad Nacional , Heredia , Costa Rica.

This study presents a hydrogeochemical analysis of spring responses (2013-2017) in the tropical mountainous region of the Central Valley of Costa Rica. The isotopic distribution of δO and δH in rainfall resulted in a highly significant meteoric water line: δH = 7.93·δO + 10. Read More

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November 2018
1 Read

Discrimination of rare earth element geochemistry and co-occurrence in sediment from Poyang Lake, the largest freshwater lake in China.

Chemosphere 2018 Nov 11;217:851-857. Epub 2018 Nov 11.

University of Chinese Academy of Sciences, Beijing, 100049, China; State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China.

Geochemical distribution of trace elements in sediments could reflect the impact of anthropogenic activities on environmental changes in aquatic ecosystems. In this study, rare earth elements (REEs) were used as geochemical tracers to study the environmental processes in a complex and dynamic aquatic environment. Both surface and core sediment samples were collected from Poyang Lake, the largest freshwater lake located in the middle-low region of the Yangtze River. Read More

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November 2018
2 Reads

Denitrifying anaerobic methane oxidation: a previously overlooked methane sink in intertidal zone.

Environ Sci Technol 2018 Nov 20. Epub 2018 Nov 20.

The intertidal zone is an open ecosystem rich in organic matter and plays an important role in global geochemical cycle. It was previously considered that methane was mainly removed by sulfate-dependent anaerobic methane oxidation (sulfate-AOM) process in marine ecosystems while other anaerobic methane oxidation processes were ignored. Recent researches have demonstrated that denitrifying anaerobic methane oxidation (DAMO), consisting of nitrite-dependent anaerobic methane oxidation (Nitrite-AOM) and nitrate-dependent anaerobic methane oxidation (Nitrate-AOM), can also oxidize methane. Read More

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November 2018

Mineralogical and geochemical characterization of mining wastes: remining potential and environmental implications, Muteh Gold Deposit, Iran.

Environ Monit Assess 2018 Nov 19;190(12):734. Epub 2018 Nov 19.

School of Geology, College of Science, University of Tehran, Tehran, Iran.

Muteh Gold Deposit is the biggest active gold district in Iran consisting of two mines, Senjedeh and Chah-Khatoun, and seven mineral occurrences. Senjedeh has been mined about 20 years ago and was recently closed because of the depletion of the reserves. Chah-Khatoun went into operation few years ago. Read More

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November 2018

Detecting and explaining why aquifers occasionally become degraded near hydraulically fractured shale gas wells.

Proc Natl Acad Sci U S A 2018 Dec 19;115(49):12349-12358. Epub 2018 Nov 19.

Department of Geosciences, Pennsylvania State University, University Park, PA 16802;

Extensive development of shale gas has generated some concerns about environmental impacts such as the migration of natural gas into water resources. We studied high gas concentrations in waters at a site near Marcellus Shale gas wells to determine the geological explanations and geochemical implications. The local geology may explain why methane has discharged for 7 years into groundwater, a stream, and the atmosphere. Read More

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December 2018
6 Reads

Characterization of naturally aged cement-solidified MSWI fly ash.

Waste Manag 2018 Oct 7;80:101-111. Epub 2018 Sep 7.

Key Laboratory for Solid Waste Management and Environment Safety, School of Environment, Tsinghua University, Beijing, PR China. Electronic address:

Solidification/stabilization (S/S) is the most common treatment for municipal solid waste incineration fly ash (MSWI-FA), and is widely applied in developed countries but has a history barely longer than 10 years in China. However, our understanding of the physicochemical characteristics of the solidified FA body after long-term natural aging is comparatively poor. Focusing on cement-solidified FA that was naturally aged for 6 years (hereafter referred to as FA-6), the physicochemical characteristics including elemental composition, mineral composition, microstructure, thermogravimetry, distribution of heavy metals in mineral phases, and leaching characteristics of inorganic salts (Na, K, Ca), anions (Cl and SO) and heavy metals (Cd, Cr, Cu, Pb, Zn) were investigated in this study. Read More

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October 2018

Acid mine drainage affects the diversity and metal resistance gene profile of sediment bacterial community along a river.

Chemosphere 2018 Nov 1;217:790-799. Epub 2018 Nov 1.

School of Environment and Sustainability, University of Saskatchewan, Saskatoon, SK S7N 5C3, Canada; Toxicology Centre, University of Saskatchewan, Saskatoon, SK S7N 5B3, Canada.

Acid mine drainage (AMD) is one of the most hazardous byproducts of some types of mining. However, research on how AMD affects the bacterial community structure of downstream riverine ecosystems and the distribution of metal resistance genes (MRGs) along pollution gradient is limited. Comprehensive geochemical and high-throughput next-generation sequencing analyses can be integrated to characterize spatial distributions and MRG profiles of sediment bacteria communities along the AMD-contaminated Hengshi River. Read More

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November 2018
3 Reads

Sunlight induced aggregation of dissolved organic matter: Role of proteins in linking organic carbon and nitrogen cycling in seawater.

Sci Total Environ 2018 Nov 10;654:872-877. Epub 2018 Nov 10.

Department of Marine Science, Texas A&M University at Galveston, Galveston, TX 77553, USA.

Organic matter export from the euphotic zone is a key component of oceanic carbon (C) and nitrogen (N) cycles. Although interactions between these two cycles are important, studies on geochemical processes to directly connect them are limited. Here we show that sunlight can induce chemical aggregation of dissolved organic matter (DOM) into high N containing photo-aggregates. Read More

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November 2018
4.099 Impact Factor

Microbial Diversity in Actively Forming Iron Oxides from Weathered Banded Iron Formation Systems.

Microbes Environ 2018 Nov 16. Epub 2018 Nov 16.

School of Earth and Environmental Sciences, The University of Queensland.

The surface crust that caps highly weathered banded iron formations (BIFs) supports a unique ecosystem that is a post-mining restoration priority in iron ore areas. Geochemical evidence indicates that biological processes drive the dissolution of iron oxide minerals and contribute to the ongoing evolution of this duricrust. However, limited information is available on present-day biogeochemical processes in these systems, particularly those that contribute to the precipitation of iron oxides and, thus, the cementation and stabilization of duricrusts. Read More

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November 2018
4 Reads

Aqueous- and solid-phase molybdenum geochemistry of oil sands fluid petroleum coke deposits, Alberta, Canada.

Chemosphere 2018 Nov 12;217:715-723. Epub 2018 Nov 12.

Department of Geological Sciences, University of Saskatchewan, Saskatoon, SK, S7N 5E2, Canada. Electronic address:

Fluid petroleum coke generated at oil sands operations in the Athabasca Oil Sands Region of northern Alberta, Canada, contains elevated concentrations of molybdenum (Mo) and other metals including nickel (Ni) and vanadium (V). Solid-phase Mo concentrations in fluid petroleum coke are typically 10 to 100 times lower than V and Ni, yet dissolved Mo concentrations in associated pore waters are often comparable with these metals. We collected pore water and solids from fluid petroleum coke deposits in the AOSR to examine geochemical controls on Mo mobility. Read More

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November 2018
3 Reads

Controls governing the spatial distribution of sediment arsenic concentrations and solid-phase speciation in a lake impacted by legacy mining pollution.

Sci Total Environ 2018 Nov 6;654:563-575. Epub 2018 Nov 6.

Department of Biology, University of Ottawa, Ottawa, ON K1N 6N5, Canada.

Forty-seven sediment cores were collected as part of a spatial survey of Long Lake, Yellowknife, NWT, Canada to elucidate the physical and geochemical controls on the distribution of arsenic (As) in sediments impacted by the aerial deposition of arsenic trioxide (AsO) from ore roasting at legacy gold mines. High-resolution profiles of dissolved As in bottom water and porewater were also collected to determine As remobilization and diffusion rates across the sediment-water interface. Arsenic concentrations in Long Lake sediments ranged from 2. Read More

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November 2018
3 Reads