31,719 results match your criteria Environmental Science and Technology [Journal]


Conserved microbial toxicity responses for acute and chronic silver nanoparticle treatments in wetland mesocosms.

Environ Sci Technol 2019 Feb 18. Epub 2019 Feb 18.

Most studies of bacterial exposure to environmental contaminants focuse on acute treatments; yet, the impacts of single, high-dose exposures on microbial communities may not readily be extended to the more likely scenario of chronic, low-dose contaminant exposures. Here, in a year-long, wetland mesocosm experiment, we compared microbial community responses to pulse (single 450 mg dose of silver) and chronic (weekly 8.7 mg doses of silver for one year) silver nanoparticle (Ag0NP) treatments, as well as a chronic treatment of "aged" sulfidized silver nanoparticles (Ag2S NPs). Read More

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http://dx.doi.org/10.1021/acs.est.8b06654DOI Listing
February 2019

Phenology of Phytoplankton Blooms in a Trophic Lake Observed from Long-Term MODIS Data.

Environ Sci Technol 2019 Feb 18. Epub 2019 Feb 18.

Phytoplankton phenology critically affects elements biogeochemical cycles, ecosystem structure, and productivity. However, our understanding about the phenological process and driving mechanism is still very limited due to the shortage of long-term observation data. We used all available daily MODIS-Aqua data from 2003 to 2017 to determine bloom start dates (BSDs) in a typical trophic lake (Lake Taihu) and investigate how phytoplankton BSDs respond to climate change and environmental factors. Read More

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http://dx.doi.org/10.1021/acs.est.8b06887DOI Listing
February 2019

Microbial Chromate Reduction Coupled to Anaerobic Oxidation of Elemental Sulfur or Zerovalent Iron.

Environ Sci Technol 2019 Feb 18. Epub 2019 Feb 18.

Chromate (Cr(VI)), as one of ubiquitous contaminants in groundwater, has posed a major threat to public health and ecological environment. Although various electron donors (e.g. Read More

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http://dx.doi.org/10.1021/acs.est.8b05053DOI Listing
February 2019
1 Read

Breakdown products from perfluorinated alkyl substances (PFAS) degradation in a plasma-based water treatment process.

Environ Sci Technol 2019 Feb 15. Epub 2019 Feb 15.

Byproducts produced when treating perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) in water using a plasma treatment process intentionally operated to treat these compounds slowly to allow for byproduct accumulation were quantified. Several linear chain perfluoroalkyl carboxylic acids (PFCAs) (C4 to C7) were identified as byproducts of both PFOA and PFOS treatment. PFOA, perfluorohexane sulfonate (PFHxS) and perfluorobutane sulfonate (PFBS) were also found to be byproducts from PFOS degradation. Read More

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http://pubs.acs.org/doi/10.1021/acs.est.8b07031
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http://dx.doi.org/10.1021/acs.est.8b07031DOI Listing
February 2019
7 Reads

Making acute tests more ecologically relevant: cadmium bioaccumulation and toxicity in an estuarine clam under various salinities modeled in a toxicokinetic-toxicodynamic framework.

Environ Sci Technol 2019 Feb 15. Epub 2019 Feb 15.

Salinity has considerable effects on the toxicity of metals in estuarine waters. The effects of salinity are manifold, making it difficult to summarize for risk assessments. In this study, we separated and quantified the multiple effects of salinity on cadmium (Cd) in a toxicokinetic-toxicodynamic framework. Read More

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http://dx.doi.org/10.1021/acs.est.8b07095DOI Listing
February 2019

Carbon Fiber-Based Flow-Through Electrode System (FES) for Water Disinfection via Direct Oxidation Mechanism with a Sequential Reduction-Oxidation Process.

Environ Sci Technol 2019 Feb 15. Epub 2019 Feb 15.

Flow-through configuration for electrochemical disinfection is considered as a promising approach to minimize the formation of toxic byproducts and energy consumption via the enhanced convective mass transport as compared with conventional flow-by one. Under this hydrodynamic condition, it is essential to ascertain the effect of sequential electro-redox processes with the cathode/anode then anode/cathode arrangements on disinfection performance. Here, carbon fiber felt (CFF) was utilized to construct two flow-through electrode systems (FESs) with sequential reduction-oxidation (cathode-anode) or oxidation-reduction (anode-cathode) processes to systematically compare their disinfection performance towards a model Escherichia coli (E. Read More

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http://dx.doi.org/10.1021/acs.est.8b07297DOI Listing
February 2019

The fate of Zn in agricultural soils: A stable isotope approach to anthropogenic impact, soil formation and soil-plant cycling.

Environ Sci Technol 2019 Feb 15. Epub 2019 Feb 15.

The supplementation of Zn to farm animal feed and the excretion via manure leads to an unintended Zn input to agricultural systems, which might compromise the long-term soil fertility. The Zn fluxes at three grassland sites in Switzerland were determined by a detailed analysis of relevant inputs (atmospheric deposition, manure, weathering) and outputs (seepage water, biomass harvest) during one hydrological year. The most important Zn input occurred through animal manure (1,076 to 1,857 g ha-1 yr-1) and Zn mass balances revealed net Zn accumulations (456 to 1,478 g ha-1 yr-1). Read More

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http://dx.doi.org/10.1021/acs.est.8b03675DOI Listing
February 2019

Mineral Surfaces As Agents of Environmental Proteolysis: Mechanisms and Controls.

Environ Sci Technol 2019 Feb 15. Epub 2019 Feb 15.

We investigated the extent to which contact with mineral surfaces affected the molecular integrity of a model protein, with an emphasis on identifying the mechanisms (hydrolysis, oxidation) and conditions leading to protein alteration. To this end, we studied the ability of four mineral surface archetypes (negatively charged, positively charged, neutral, redox-active) to abiotically fragment a well-characterized protein (GB1) as a function of pH and contact time. GB1 was exposed to the soil minerals montmorillonite, goethite, kaolinite, and birnessite at pH 5 and pH 7 for 1, 8, 24, and 168 hours and the supernatant was screened for peptide fragments using Tandem Mass Spectrometry. Read More

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http://pubs.acs.org/doi/10.1021/acs.est.8b05583
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http://dx.doi.org/10.1021/acs.est.8b05583DOI Listing
February 2019
2 Reads

Evaluation of a Pilot Anaerobic Secondary Effluent for Potable Reuse: Impact of Different Disinfection Schemes on Organic Fouling of RO Membranes and DBP Formation.

Environ Sci Technol 2019 Feb 14. Epub 2019 Feb 14.

Anaerobic biological secondary treatment has the potential to substantially reduce the energy cost and footprint of wastewater treatment. However, for utilities seeking to meet future water demand through potable reuse, the compatibility of anaerobically-treated secondary effluent with potable reuse trains has not been evaluated. This study characterized the effects of different combinations of chloramines, ozone and biological activated carbon (BAC), applied as pretreatments to mitigate organic chemical fouling of reverse osmosis (RO) membranes and the production of 43 disinfection byproducts (DBPs). Read More

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http://dx.doi.org/10.1021/acs.est.8b05473DOI Listing
February 2019

Hydrodynamic versus surface interaction impacts of roughness in closing the gap between favorable and unfavorable colloid transport conditions.

Environ Sci Technol 2019 Feb 14. Epub 2019 Feb 14.

Recent experiments revealed that roughness decreases the gap in colloid attachment between favorable (repulsion absent) and unfavorable (repulsion present) conditions through a combination of hydrodynamic slip and surface interactions with asperities. Hydrodynamic slip was calibrated to experimentally-observed tangential colloid velocities, demonstrating that slip length was equal to maximum asperity relief, thereby providing a functional relationship between slip and roughness metrics. Incorporation of the slip length in mechanistic particle trajectory simulations yielded the observed modest decrease in attachment over rough surfaces under favorable conditions, with the observed decreased attachment being due to reduced colloid delivery rather than decreased attraction. Read More

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http://dx.doi.org/10.1021/acs.est.8b06162DOI Listing
February 2019
1 Read

Legacy and currently used organic contaminants in human hair and hand wipes of female e-waste dismantling workers and workplace dust in South China.

Environ Sci Technol 2019 Feb 14. Epub 2019 Feb 14.

Legacy organic contaminants, such as polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs), and several currently used organic contaminants, such as novel brominated retardants (NBFRs), organophosphate flame retardants (OPFRs), and Dechlorane Plus (DPs), were measured in the segmented hair and hand wipes of e-waste dismantling workers and in the dust from their working place in an e-waste recycling site in South China to assess the accumulation and sources of organic contaminants in the hair shaft. The median concentrations of DPs, PBDEs, NBFRs, PCBs and OPFRs in hair samples were 23.5, 154, 156, 349 and 371 ng/g, respectively. Read More

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http://pubs.acs.org/doi/10.1021/acs.est.8b05503
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http://dx.doi.org/10.1021/acs.est.8b05503DOI Listing
February 2019
1 Read

Polyvinylchloride Microplastics Affect Methane Production from the Anaerobic Digestion of Waste Activated Sludge through Leaching Toxic Bisphenol-A.

Environ Sci Technol 2019 Feb 13. Epub 2019 Feb 13.

The retention of polyvinylchloride (PVC) microplastics in sewage sludge during wastewater treatment raises concerns recently. However, the effects of PVC microplastics on methane production from anaerobic digestion of waste activated sludge (WAS) have never been documented. In this work, the effects of PVC microplastics (1 mm, 10-60 particles/g TS) on anaerobic methane production from WAS were investigated. Read More

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http://dx.doi.org/10.1021/acs.est.8b07069DOI Listing
February 2019
1 Read

Spatially explicit large-scale environmental risk assessment of pharmaceuticals in surface water in China.

Environ Sci Technol 2019 Feb 13. Epub 2019 Feb 13.

With improving health care and an aging population, the consumption of human pharmaceuticals in China has been increasing dramatically. Environmental risks posed by many active pharmaceutical ingredients (APIs) are still unknown. This study used a spatially-explicit dilution-factor methodology to model predicted environmental concentrations (PECs) of 11 human-use APIs in surface water for a preliminary environmental risk assessment (ERA). Read More

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http://dx.doi.org/10.1021/acs.est.8b07054DOI Listing
February 2019

Flow-electrode CDI Removes the Uncharged Ca-UO2-CO3 Ternary Complex from Brackish Potable Groundwater: Complex Dissociation, Transport and Sorption.

Environ Sci Technol 2019 Feb 13. Epub 2019 Feb 13.

Unacceptably high uranium concentrations in decentralized and remote potable groundwater resources, especially those of high hardness (e.g. high Ca2+, Mg2+ and CO32- concentrations), are a common worldwide problem. Read More

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http://dx.doi.org/10.1021/acs.est.8b07157DOI Listing
February 2019

Electrochemical analysis of changes in iron oxide reducibility during abiotic ferrihydrite transformation into goethite and magnetite.

Environ Sci Technol 2019 Feb 13. Epub 2019 Feb 13.

Electron transfer to ferric iron in (oxyhydr-)oxides (hereafter iron oxides) is a critical step in many processes that are central to the biogeochemical cycling of elements and to contaminant dynamics. Understanding these processes requires analytical approaches that allow for characterizing the reactivity of iron oxides towards reduction under thermodynamically controlled conditions. Here, we used mediated electrochemical reduction (MER) to follow changes in iron oxide reduction extents and rates during abiotic ferrous iron-induced transformation of six-line ferrihydrite. Read More

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http://dx.doi.org/10.1021/acs.est.8b07190DOI Listing
February 2019

Evaluating the Performance of Micro-Encapsulated CO2 Sorbents during CO2 Absorption and Regeneration Cycling.

Environ Sci Technol 2019 Feb 13. Epub 2019 Feb 13.

We encapsulated six solvents with novel physical and chemical properties for CO2 sorption within gas-permeable polymer shells, creating Micro-Encapsulated CO2 Sorbents (MECS), to improve the CO2 absorption kinetics and handling of the solvents for post-combustion CO2 capture from flue gas. The solvents were sodium carbonate (Na2CO3) solution, uncatalyzed and with two different promoters, two ionic liquid (IL) solvents, and one CO2-binding organic liquid (CO2BOL). We subjected each of the six MECS to multiple CO2 absorption and regeneration cycles and measured the working CO2 absorption capacity as a function of time to identify promising candidate MECS for large-scale carbon capture. Read More

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http://dx.doi.org/10.1021/acs.est.8b06442DOI Listing
February 2019

The Impact of Natural Variation of OH Radical Demand of Drinking Water Sources on the Optimum Operation of the UV/H2O2 Process.

Environ Sci Technol 2019 Feb 13. Epub 2019 Feb 13.

Hydroxyl radical (•OH) water demand is a key parameter which impacts the design and operation of UV/H2O2 process in water remediation projects. Long-term monitoring of the •OH water demand in water sources used for drinking water production indicated significant seasonal variations of this parameter (1.59×104 to 4. Read More

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http://dx.doi.org/10.1021/acs.est.8b05686DOI Listing
February 2019

Triplet-State Photochemistry of Dissolved Organic Matter: Triplet-State Energy Distribution and Surface Electric Charge Conditions.

Environ Sci Technol 2019 Feb 18. Epub 2019 Feb 18.

Department of Environmental Science & Engineering , Fudan University , Shanghai 200433 , P. R. China.

Excited triplet states of chromophoric dissolved organic matter (CDOM*) are highly reactive species in sunlit surface waters and play a critical role in reactive oxygen species (ROS) formation and pollutant attenuation. In the present study, a series of chemical probes, including sorbic acid, sorbic alcohol, sorbic amine, trimethylphenol, and furfuryl alcohol, were employed to quantitatively determine CDOM* and O in various organic matters. Using a high concentration of sorbic alcohol as high-energy triplet states quencher, CDOM* can be first distinguished as high-energy triplet states (>250 kJ mol) and low-energy triplet states (<250 kJ mol). Read More

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http://dx.doi.org/10.1021/acs.est.8b06574DOI Listing
February 2019

Spatial and temporal variability in attenuation of polar organic micropollutants in an urban lowland stream.

Environ Sci Technol 2019 Feb 13. Epub 2019 Feb 13.

Contamination of rivers by trace organic compounds (TrOCs) poses a risk for aquatic ecosystems and drinking water quality. Spatially- and temporally-varying environmental conditions are expected to play a major role in controlling in-stream attenuation of TrOCs. This variability is rarely captured by in situ studies of TrOC attenuation. Read More

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http://dx.doi.org/10.1021/acs.est.8b05488DOI Listing
February 2019

Resolution of the ongoing challenge of estimating nonpoint source neonicotinoid pollution in the Yangtze River Basin using a modified mass balance approach.

Environ Sci Technol 2019 Feb 13. Epub 2019 Feb 13.

Neonicotinoid insecticides have been widely consumed worldwide, particularly in China. There is a growing interest in the environmental research community about the occurrence, fates, sources, and risks of neonicotinoids. Nine neonicotinoids in river/lake water were measured at 12 sites along the Yangtze River Basin during the dry and wet seasons in 2016, and nonpoint sources were also identified based on a modified mass balance method. Read More

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http://dx.doi.org/10.1021/acs.est.8b06096DOI Listing
February 2019

Characterization of polycyclic aromatic compounds in commercial pavement sealcoat products for enhanced source apportionment.

Environ Sci Technol 2019 Feb 12. Epub 2019 Feb 12.

Coal tar-based sealcoat (CTSC) products are an urban source of polycyclic aromatic compounds (PACs) to the environment. However, efforts to assess the environmental fate and impacts of CTSC-derived PACs are hindered by the ubiquity of (routinely monitored) PACs released from other environmental sources. To advance source identification of CTSC-derived PACs, we use comprehensive two-dimensional gas chromatography-high resolution mass spectrometry (GC×GC/HRMS) to characterize the major and minor components of CTSC products in comparison to those in other sources of PACs, viz. Read More

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http://dx.doi.org/10.1021/acs.est.8b06779DOI Listing
February 2019
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Polycyclic Aromatic Hydrocarbons not declining in Arctic air despite global emission reduction.

Environ Sci Technol 2019 Feb 12. Epub 2019 Feb 12.

Two decades of atmospheric measurements of polycyclic aromatic hydrocarbons (PAHs) were conducted at three Arctic sites, i.e., Alert, Canada; Zeppelin, Svalbard; and Pallas, Finland. Read More

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http://dx.doi.org/10.1021/acs.est.8b05353DOI Listing
February 2019
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Airborne Fine Particles Induce Hematological Effects through Regulating the Crosstalk of the Kallikrein-Kinin, Complement and Coagulation Systems.

Environ Sci Technol 2019 Feb 11. Epub 2019 Feb 11.

Particulate air pollution caused by human activities has drawn global attention due to its potential health risks. Considering the inevitable contact of inhaled airborne fine particulate matter (PM) with the plasma, the hematological effects of PM through its interaction with plasma components are worthy of being studied. In this study, the potential perturbation of PM in hematological homeostasis through triggering the crosstalk of the kallikrein-kinin system (KKS), complement, and coagulation systems in plasma was investigated. Read More

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http://dx.doi.org/10.1021/acs.est.8b05817DOI Listing
February 2019

Non-Polyamide Based Nanofiltration Membranes Using Green Metal-Organic Coordination Complexes: Implications for the Removal of Trace Organic Contaminants.

Environ Sci Technol 2019 Feb 11. Epub 2019 Feb 11.

Polyamide-based thin film composite (TFC) membranes are generally optimized for salt rejection but not for the removal of trace organic contaminants (TrOCs). The insufficient rejection of TrOCs such as endocrine disrupting compounds (EDCs) by polyamide membranes can jeopardize product water safety in wastewater reclamation. In this study, we report a novel non-polyamide membrane chemistry using green tannic acid-iron (TA-Fe) complexes to remove TrOCs. Read More

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http://dx.doi.org/10.1021/acs.est.8b06422DOI Listing
February 2019

Electro-assisted Adsorption of Zn(II) on Activated Carbon Cloth in Batch-Flow Mode: Experimental and Theoretical Investigations.

Environ Sci Technol 2019 Feb 19. Epub 2019 Feb 19.

College of Environmental Science and Engineering , Hunan University , Changsha 410082 , P. R. China.

High levels of zinc ion (Zn) in environmental scenarios have long been considered to be harmful, and this study was experimentally and theoretically performed to explore the feasibility of electro-assisted adsorption of Zn on activated carbon cloth from aqueous solutions in batch-flow mode. The characteristics of carbon cloth were systematically evaluated using cyclic voltammetry and various surface characterization techniques. Effects of operating parameters, including charging voltage, feed Zn concentration, solution volume, and flow rate, on the dynamic removal process of Zn were examined. Read More

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http://dx.doi.org/10.1021/acs.est.8b05909DOI Listing
February 2019
1 Read

Deposition and source identification of nitrogen heterocyclic polycyclic aromatic compounds in snow, sediment, and air samples from the Athabasca Oil Sands Region.

Environ Sci Technol 2019 Feb 11. Epub 2019 Feb 11.

Polycyclic aromatic compounds (PACs) can have multiple sources in the Athabasca Oil Sands Region (AOSR). The current study was designed to identify and explore the potential of nitrogen heterocyclic PACs (NPACs) as source indicators in snowpack, lake sediment and passive air samples from the AOSR during 2014-2015. Source samples including petroleum coke (petcoke), haul road dust and unprocessed oil sands were also analyzed. Read More

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http://dx.doi.org/10.1021/acs.est.8b06175DOI Listing
February 2019

Iron-manganese (oxyhydro)oxides, rather than oxidation of sulfides, determine the mobilization of Cd during soil drainage in paddy soil systems.

Environ Sci Technol 2019 Feb 11. Epub 2019 Feb 11.

The pre-harvest drainage of rice paddy fields during the grain filling stage can result in a substantial mobilization of Cd in soil and consequently elevated grain Cd concentration. However, the processes controlling the mobilization of Cd remains poorly understood. Using twelve field-contaminated paddy soils, we investigated the factors controlling the temporal changes in Cd solubility in paddy soils that were incubated anaerobically for 40 d followed by a 20 d oxidation period. Read More

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http://dx.doi.org/10.1021/acs.est.8b06863DOI Listing
February 2019
2 Reads

Visualized Networking of Co-regulated Lipids in Human Blood Based on High-Throughput Screening Data: Implications for Exposure Assessment.

Environ Sci Technol 2019 Feb 11. Epub 2019 Feb 11.

Exposure to environmental chemicals could disturb lipidome homeostasis in biotas. Comprehensive identification and interpretation of lipid molecules in biological samples are of great importance to elucidate the potential changes in lipid homeostasis upon exposure to various environmental stimuli. In this study, a total of 156 human blood samples were collected including 108 general citizens (control group) and 48 employees in a municipal solid waste incineration (MSWI) plant (occupational exposure group). Read More

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http://dx.doi.org/10.1021/acs.est.8b06289DOI Listing
February 2019

Within-City Spatial Variations in Multiple Measures of PM2.5 Oxidative Potential in Toronto, Canada.

Environ Sci Technol 2019 Feb 8. Epub 2019 Feb 8.

Few studies have characterized within-city spatial variations in the oxidative potential of fine particulate air pollution (PM2.5). In this study, we evaluated multiple measures of PM2. Read More

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http://dx.doi.org/10.1021/acs.est.8b05543DOI Listing
February 2019
1 Read

Critical Review: Biogeochemical Networking of Iron, Is It Important in Constructed Wetlands for Wastewater Treatment?

Environ Sci Technol 2019 Feb 8. Epub 2019 Feb 8.

Iron is present in all types of wastewater, however besides acid mine drainage, where it is a major constituent of concern, it is usually neglected in other types of wastewaters. However, in all constructed wetlands iron plays important role in removal of organics, phosphorus and does have an impact on transformation of nitrogen and sulphur. The biogeochemistry of iron is well understood in natural wetlands but knowledge about iron impact on microbiological and chemical transformations during wastewater treatment in constructed wetlands is very limited. Read More

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http://dx.doi.org/10.1021/acs.est.8b07136DOI Listing
February 2019
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Screening of potential PFOS alternatives to decrease liver bioaccumulation: Experimental and computational approaches.

Environ Sci Technol 2019 Feb 8. Epub 2019 Feb 8.

Perfluorooctane sulfonate (PFOS) is a persistent organic pollutant with significant bioaccumulation potential in liver tissues. Exposure to PFOS could cause increase of liver weight, induce adenomas of the liver and hepatomegaly. Alternatives of PFOS might be designed and synthesized that have significantly lower liver bioaccumulation. Read More

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http://dx.doi.org/10.1021/acs.est.8b05564DOI Listing
February 2019
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Selenium Stimulates Cadmium Detoxification in Caenorhabditis elegans through Thiols-Mediated Nanoparticles Formation and Secretion.

Environ Sci Technol 2019 Feb 19. Epub 2019 Feb 19.

CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry , University of Science and Technology of China , Hefei 230026 , P. R. China.

Antagonism between heavy metal and selenium (Se) could significantly affect their biotoxicity, but little is known about the mechanisms underlying such microbial-mediated antagonistic processes as well as the formed products. In this work, we examined the cadmium (Cd)-Se interactions and their fates in Caenorhabditis elegans through in vivo and in vitro analysis and elucidated the machinery of Se-stimulated Cd detoxification. Although the Se introduction induced up to 3-fold higher bioaccumulation of Cd in C. Read More

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http://dx.doi.org/10.1021/acs.est.8b04200DOI Listing
February 2019
5.330 Impact Factor

Evaluation of U.S. Manufacturing Subsectors at Risk of Physical Water Shortages.

Environ Sci Technol 2019 Feb 7. Epub 2019 Feb 7.

The potential impact of water shortages on U.S. manufacturing is unknown. Read More

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http://dx.doi.org/10.1021/acs.est.8b04896DOI Listing
February 2019
3 Reads

The Renewable Fuel Standard May Limit Overall Greenhouse Gas Savings by Corn Stover-based Cellulosic Biofuels in the U.S. Midwest: Effects of the Regulatory Approach on Projected Emissions.

Environ Sci Technol 2019 Feb 7. Epub 2019 Feb 7.

The Renewable Fuel Standard (RFS) program specifies a greenhouse gas (GHG) reduction threshold for cellulosic biofuels, while the Low Carbon Fuel Standard (LCFS) program in California does not. Here, we investigate the effects of the GHG threshold under the RFS on projected GHG savings from two corn stover-based biofuel supply chain systems in the United States Midwest. The analysis is based on a techno-economic framework that minimizes ethanol selling price. Read More

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http://dx.doi.org/10.1021/acs.est.8b02808DOI Listing
February 2019
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Contributions of city-specific PM2.5 to differential in vitro oxidative stress and toxicity implications between Beijing and Guangzhou of China.

Environ Sci Technol 2019 Feb 7. Epub 2019 Feb 7.

Growing literature has documented varying toxic potencies of source- or site-specific fine particulate matter (PM2.5), as opposed to that particle toxicities are treated as independent of composition given the incomplete understanding of the toxicity of the constituents. Quantifying component-specific contribution is the key to unlocking the geographical disparities of particle toxicity from a mixture perspective. Read More

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http://pubs.acs.org/doi/10.1021/acs.est.9b00449
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http://dx.doi.org/10.1021/acs.est.9b00449DOI Listing
February 2019
2 Reads
5.330 Impact Factor

Unravelling the structure of chemisorbed CO2 species in mesoporous aminosilicas: a critical survey.

Environ Sci Technol 2019 Feb 7. Epub 2019 Feb 7.

Chemisorbent materials, based on porous aminosilicas, are amongst the most promising adsorbents for direct air capture applications, one of the key technologies to mitigate carbon emissions. Herein, a critical survey of all reported chemisorbed CO2 species, which may form in aminosilica surfaces, is performed by revisiting and providing new experimental proofs of assignment of the distinct CO2 species reported thus far in the literature, highlighting controversial assignments regarding the existence of chemisorbed CO2 species still under debate. Models of carbamic acid, alkylammonium carbamate with different conformations and hydrogen bonding arrangements were ascertained using density functional theory (DFT) methods, mainly through the comparison of the experimental 13C and 15N NMR chemical shifts with those obtained computationally. Read More

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http://dx.doi.org/10.1021/acs.est.8b05978DOI Listing
February 2019
1 Read

Modeling the Effect of Relative Humidity on Adsorption Dynamics of Volatile Organic Compound (VOC) onto Activated Carbon.

Environ Sci Technol 2019 Feb 7. Epub 2019 Feb 7.

A two-dimensional heterogeneous mathematical model was developed and validated to study the effect of relative humidity on volatile organic compound (VOC) adsorption onto activated carbon. The dynamic adsorption model consists of the macroscopic mass, momentum, and energy conservation equations, and includes a multicomponent adsorption isotherm to predict the competitive adsorption equilibria between VOC and water vapor, which is described by an extended Manes method. Experimental verifications show that the model predicted the breakthrough profiles during competitive adsorption of the studied VOCs (2-propanol, acetone, n-butanol, toluene, 1,2,4- trimethylbenzene) at relative humidity range 0-95% with an overall mean relative absolute error (MRAE) of 11. Read More

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http://dx.doi.org/10.1021/acs.est.8b05664DOI Listing
February 2019

Controls of Methylmercury Bioaccumulation in Forest Floor Food Webs.

Environ Sci Technol 2019 Feb 18. Epub 2019 Feb 18.

Department of Ecology, Evolution, and Behavior , University of Minnesota , St. Paul , Minnesota 55108 , United States.

Compared to the extensive research on aquatic ecosystems, very little is known about the sources and trophic transfer of methylmercury (MeHg) in terrestrial ecosystems. In this study, we examine energy flow and trophic structure using stable carbon (δC) and nitrogen (δN) isotope ratios, respectively, and MeHg levels in basal resources and terrestrial invertebrates from four temperate forest ecosystems. We show that MeHg levels in biota increased significantly ( p < 0. Read More

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http://dx.doi.org/10.1021/acs.est.8b06053DOI Listing
February 2019
2 Reads

Photochemical Transformation of Poly(butylene adipate- co-terephthalate) and Its Effects on Enzymatic Hydrolyzability.

Environ Sci Technol 2019 Feb 15. Epub 2019 Feb 15.

Institute of Biogeochemistry and Pollutant Dynamics , ETH Zurich , 8092 Zurich , Switzerland.

Biodegradable polyesters are being increasingly used to replace conventional, nondegradable polymers in agricultural applications such as plastic film for mulching. For many of these applications, poly(butylene adipate- co-terephthalate) (PBAT) is a promising biodegradable material. However, PBAT is also susceptible to photochemical transformations. Read More

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http://dx.doi.org/10.1021/acs.est.8b06458DOI Listing
February 2019
1 Read

Reductive dehalogenation of trichloromethane by two different Dehalobacter restrictus strains reveal opposing dual element isotope effects.

Environ Sci Technol 2019 Feb 6. Epub 2019 Feb 6.

Trichloromethane (TCM) is a frequently detected and persistent groundwater contaminant. Recent studies have reported that two closely related Dehalobacter strains (UNSWDHB and CF) transform TCM to dichloromethane, with inconsistent carbon isotope effects (ε13CUNSWDHB = -4.3 ± 0. Read More

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http://dx.doi.org/10.1021/acs.est.8b03717DOI Listing
February 2019

Field-Enhanced Nanoconvection Accelerated Electrocatalytic Conversion of Water Contaminants and Electricity Generation.

Environ Sci Technol 2019 Feb 19. Epub 2019 Feb 19.

Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China.

The development of high-performance electrocatalytic systems for the extraction of energy from contaminants in wastewater are urgently needed in emerging renewable energy technologies. However, given that most of the contaminants are present in low concentrations, the heterogeneous catalytic reactions often suffer from slow kinetics due to mass transfer limitations. Here, we report that localized free convection induced by enthalpy change of the reaction can enhance interfacial mass transport. Read More

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http://dx.doi.org/10.1021/acs.est.8b06620DOI Listing
February 2019
1 Read

In Situ Growth of Metal-Organic Frameworks in Three-Dimensional Aligned Lumen Arrays of Wood for Rapid and Highly Efficient Organic Pollutant Removal.

Environ Sci Technol 2019 Feb 19. Epub 2019 Feb 19.

State Key Laboratory of Applied Organic Chemistry and Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province , Lanzhou University , Lanzhou 730000 , P. R. China.

Organic contaminants in water have become one of the most serious environmental problems worldwide. Adsorption is one of the most promising approaches to remove organic pollutants from water. However, the existing adsorbents have relatively low removal efficiency, complex preparation processes, and high cost, which limit their practical applications. Read More

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http://dx.doi.org/10.1021/acs.est.8b06564DOI Listing
February 2019
1 Read

Divalent Mercury in Dissolved Organic Matter Is Bioavailable to Fish and Accumulates as Dithiolate and Tetrathiolate Complexes.

Environ Sci Technol 2019 Feb 5. Epub 2019 Feb 5.

ISTerre, Université Grenoble Alpes, CNRS , 38000 Grenoble , France.

The freshwater cyprinid Tanichthys albonubes was used to assess the bioavailability of divalent mercury (Hg(II)) complexed in dissolved organic matter (DOM) to fish. The fish acquired 0.3 to 2. Read More

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http://pubs.acs.org/doi/10.1021/acs.est.8b06579
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http://dx.doi.org/10.1021/acs.est.8b06579DOI Listing
February 2019
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Expansion of the Petroleum Refinery Life Cycle Inventory Model to Support Characterization of a Full Suite of Commonly Tracked Impact Potentials.

Environ Sci Technol 2019 Feb 5;53(4):2238-2248. Epub 2019 Feb 5.

University of Calgary , Calgary , Alberta T2N 1N4 , Canada.

This study updates the Petroleum Refinery Life Cycle Inventory Model (PRELIM) to provide a more complete gate-to-gate life cycle inventory and to allow for the calculation of a full suite of impact potentials commonly used in life cycle assessment (LCA) studies. Prior to this update, PRELIM provided results for energy use and greenhouse gas emissions from petroleum refineries with a level of detail suitable for most LCA studies in support of policy decisions. We updated the model to add criteria air pollutants, hazardous air pollutants, releases to water, releases to land, and managed wastes reflecting 2014 reported releases and waste management practices using data from the U. Read More

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http://dx.doi.org/10.1021/acs.est.8b05572DOI Listing
February 2019
2 Reads

Oxidation of Sulfonamide Antibiotics of Six-Membered Heterocyclic Moiety by Ferrate(VI): Kinetics and Mechanistic Insight into SO Extrusion.

Environ Sci Technol 2019 Feb 15. Epub 2019 Feb 15.

Department of Environmental and Occupational Health, School of Public Health , Texas A&M University , College Station , Texas 77843 , United States.

This work presents ferrate(VI) (FeO, Fe) oxidation of a wide range of sulfonamide antibiotics (SAs) containing five- and six-membered heterocyclic moieties ( R) in their molecular structures. Kinetics measurements of the reactions between Fe and SAs at different pH (6.5-10. Read More

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http://dx.doi.org/10.1021/acs.est.8b06535DOI Listing
February 2019

A Novel Active Sampler Coupling Osmotic Pump and Solid Phase Extraction for in Situ Sampling of Organic Pollutants in Surface Water.

Environ Sci Technol 2019 Feb 15. Epub 2019 Feb 15.

Department of Environmental Sciences , University of California , Riverside , California 92521 , United States.

Active samplers for ambient monitoring of trace contaminants in surface water are highly desirable, but their use is often constrained by power supply. Here, we proposed a novel solution by coupling an improved osmotic pump (OP) with a solid-phase extraction (SPE) cartridge to construct a power-free active sampler for organic contaminants. The OP simply consisted of two cylindrical chambers separated by a reverse osmosis membrane. Read More

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http://dx.doi.org/10.1021/acs.est.8b03760DOI Listing
February 2019
1 Read
5.330 Impact Factor

Degradation and Deactivation of Bacterial Antibiotic Resistance Genes during Exposure to Free Chlorine, Monochloramine, Chlorine Dioxide, Ozone, Ultraviolet Light, and Hydroxyl Radical.

Environ Sci Technol 2019 Feb 3;53(4):2013-2026. Epub 2019 Feb 3.

Department of Civil and Environmental Engineering , University of Washington (UW) , Seattle , Washington 98195-2700 , United States.

This work investigated degradation (measured by qPCR) and biological deactivation (measured by culture-based natural transformation) of extra- and intracellular antibiotic resistance genes (eARGs and iARGs) by free available chlorine (FAC), NHCl, O, ClO, and UV light (254 nm), and of eARGs by OH, using a chromosomal ARG ( blt) of multidrug-resistant Bacillus subtilis 1A189. Rate constants for degradation of four 266-1017 bp amplicons adjacent to or encompassing the acfA mutation enabling blt overexpression increased in proportion to #AT+GC bps/amplicon, or in proportion to #5'-GG-3' or 5'-TT-3' doublets/amplicon, with respective values ranging from 0.59 to 2. Read More

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http://pubs.acs.org/doi/10.1021/acs.est.8b04393
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http://dx.doi.org/10.1021/acs.est.8b04393DOI Listing
February 2019
4 Reads

Characterization and Reduction of In-Use CH Emissions from a Dual Fuel Marine Engine Using Wavelength Modulation Spectroscopy.

Environ Sci Technol 2019 Feb 13. Epub 2019 Feb 13.

Department of Mechanical Engineering , University of British Columbia , 2054-6250 Applied Science Lane , Vancouver , British Columbia V6T 1Z4 , Canada.

In-use exhaust stream CH emissions from two dual fuel marine engines were characterized and strategies for CH reduction were identified and evaluated. For this, a low-cost, portable, wavelength modulation spectroscopy (WMS) system was developed. The performance of the developed WMS sensor was assessed using gas standards and demonstrated on a heavy-duty, diesel pilot ignited, direct-injection natural gas research engine through comparison to a flame ionization detector. Read More

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http://dx.doi.org/10.1021/acs.est.8b04244DOI Listing
February 2019
2 Reads