695 results match your criteria Annali Di Chimica[Journal]


The degradation products of aniline in the solutions with ozone and kinetic investigations.

Ann Chim 2007 Oct;97(10):1129-38

Yildiz Technical University, Department of Chemistry, 34210 Istanbul, Turkiye.

Aromatic compounds are extensively used in several industries and can cause pollution in water sources. This work aims at examining the degradability of aniline in aqueous solutions by ozone-induced cleavage, and at determining the kinetics of the cited cleavage reactions. Aniline was prepared in four different concentrations and the flow rate of ozone supplied to each solution was selected. Read More

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October 2007

Energy-dispersive and x-ray photoelectron spectroscopy and electron microscopy of new quininium-plastic membrane electrodes.

Ann Chim 2007 Oct;97(10):1117-27

Department of Chemistry, Faculty of Science, Kuwait University, P.O. Box 5969, Safat 13060, Kuwait.

New quininium (Qn) plastic membrane electrodes of the conventional type were constructed and characterized. They are based on incorporation of Qn-reineckate (QnRn) ion-pair, Qn-phosphotungstate (Qn3-PT), or Qn-phosphomolybdate (Qn3PM) ion associate into a poly(vinyl chloride) membrane. The electrodes are selective for Qn and have been successfully used for the determination of Qn2SO4 in pharmaceutical tablets. Read More

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October 2007

Spectrophotometric characterisation of surface lakewater samples: implications for the quantification of nitrate and the properties of dissolved organic matter.

Ann Chim 2007 Oct;97(10):1107-16

Dipartimento di Chimica Analitica, Università di Torino, Via Pietro Giuria 5, 10125 Torino, Italy.

Filtered lakewater samples, mainly collected in the province of Torino (Piedmont, NW Italy) were characterised from a spectrophotometric point of view. Spectral data were then used for the direct determination of nitrate by three-wavelength photometry, which should account for the spectral interference by dissolved organic matter (DOM), and the results compared with nitrate quantification by ion chromatography. The spectrophotometric method proved very suitable for nitrate measurement, with unity slope (micro +/- sigma = 0. Read More

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October 2007

4-(N,N-diethylamino) benzaldehyde thiosemicarbazone in the spectrophotometric determination of palladium.

Ann Chim 2007 Oct;97(10):1097-106

Department of Chemistry, National Institute of Technology Karnataka, Surathkal, Srinivasnagar - 575 025, Karnataka, India.

4-(N,N-diethylamino)benzaldehyde thiosemicarbazone(DEABT) is proposed as a sensitive and selective analytical reagent for the spectrophotometric determination of palladium(II). The reagent reacts with palladium (II) in a potassium hydrogen phthalate-hydrochloric acid buffer of pH 3.0, to form a yellow complex. Read More

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October 2007

An investigation on calcium (II) oxalate as solubility and universal standard.

Ann Chim 2007 Oct;97(10):1085-96

Dipartimento di Chimica, Università "La Sapienza", P.le A. Moro 5, 00185 Roma, Italy.

The investigation on calcium (II) oxalate is carried out in order to study its solubility in different ionic media. In the same conditions the protonation constants of oxalate and the stability of complex species have been determined. As the stoichiometric composition of the solid calcium (II) oxalate prepared for the investigation was accurately checked, the salt CaC2O4 x H2O is proposed as universal (chelometry, redox, acidimetry) standard. Read More

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October 2007

Rapid determination of volatile constituents in safflower by microwave distillation and simultaneous solid-phase microextraction coupled with gas chromatography-mass spectrometry.

Ann Chim 2007 Oct;97(10):1075-84

Department of Pharmaceutical Analysis, School of Pharmacy, Fudan University, Shanghai 200032, PR China.

In this paper, microwave distillation and solid-phase microextraction coupled with gas chromatography-mass spectrometry (MD-SPME/GC-MS) was developed for the analysis of essential components in safflower. Using the MD-SPME technique, the isolation, extraction and concentration of volatile compounds in safflower were carried out in only one step. Some parameters affecting the extraction efficiency such as SPME fiber coating, microwave power, irradiation time and the volume of water added were optimized. Read More

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October 2007

Potentiometric membrane sensor for the selective determination of pethidine in pharmaceutical preparations and biological fluids.

Ann Chim 2007 Oct;97(10):1065-74

Department of Analytical Chemistry, Faculty of Pharmacy, Zagazig University, Egypt.

The construction and general performance characteristics of a novel potentiometric PVC membrane sensor based on pethidine-phosphomolybdate as electroactive material for the determination of pethidine are described. This sensor exhibits fast, stable and near-Nernstain response 55.24 +/- 0. Read More

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October 2007

Digestion of titanium bearing geologic materials involving microwaves.

Ann Chim 2007 Oct;97(10):1047-64

Department of Chemistry, Meerut College, U.P., India.

An environmentally friendly and rapid digestion procedure involving 10 mL of acid mixture (HNO3 : HCl : HF = 2:2:1) for 0.1 g of sample in closed vessel microwave digester following heating program : 250W for 10 min., hold time 2 min. Read More

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October 2007

Determination of trace concentrations of elements in high purity tellurium by radio frequency glow discharge optical emission spectrometer (RF-GDOES).

Ann Chim 2007 Oct;97(10):1039-46

Analytical Chemistry Division, Center for Materials for Electronics Technology (CMET), IDA, Phase-III, HCL Post, Cherlapalli, Hyderabad - 500 051, India.

A method was established for the determination of trace impurities in high purity tellurium (Te) 99.9999 (6N) by radio frequency glow discharge optical emission spectrometry (RF-GDOES). The optimized parameters are power, argon pressure, pre-integration time, analysis time and selection of wavelength. Read More

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October 2007

Measurements of lower carbonyls and hydrocarbons at Ny-Alesund, Svalbard.

Ann Chim 2007 Oct;97(10):1027-37

CNR Institute for Atmospheric Pollution, CP 10, 00016-Monterotondo Scalo, Rome, Italy.

Measurements of gaseous organic compounds were carried out near Ny-Alesund, in the Norwegian Arctic, during September 2004. Twenty alkanes, alkenes and aromatic hydrocarbons from ethane to toluene and six aldehydes and ketones from formaldehyde to butanal, were identified and quantified in air samples. Hydrocarbons showed a quite uniform distribution, with ethane being by far the most abundant component (> 1 ppb), followed by propane (> 0. Read More

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October 2007

The effects of some operational parameters in photodegradation of benzylamine and aniline and their kinetics in aqueous suspension of TiO2 and Pt -loaded TiO2.

Ann Chim 2007 Oct;97(10):1015-26

Chemistry Department, Yasouj University, Yasouj 75918-74831, P.O. Box-353, Iran.

Photocatalytic degradation of benzylamine and aniline on TiO2, Pt-modified TiO2, ZnO and ZnS in aqueous solution has been investigated. The degradation of the compounds follows a pseudo-first-order kinetics according to Langmuir-Hinshelwood model. The degradation process of benzylamine and aniline was evaluated by ninhydrin spectrophotometric method using UV-visible spectrophotometer in lambda(max) = 538 and 525 nm, respectively. Read More

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October 2007

The electrochemical behavior and direct determination of tyrosine at a glassy carbon electrode modified with poly (9-aminoacridine).

Ann Chim 2007 Oct;97(10):1005-13

School of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China.

9-Aminoacridine was firstly immobilized on the surface of a glassy carbon electrode to form a poly (9-aminoacridine) film modified electrode. The results demonstrated that the modified electrode exhibited a high degree of catalytic activity towards the oxidation of tyrosine and can resolve the interference of tryptophan in the determination of tyrosine. Compared with the bare electrode, the peak current had obviously increased, and the peak potential had shifted in a negative direction. Read More

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October 2007

Synthesis and characteristics of macroporous epoxy resin-triethylenetetramine polymer modified by sodium chloroacetate for copper chelation in aqueous solution.

Ann Chim 2007 Oct;97(10):995-1003

State Key Laboratory Base of Novel Functional Materials and Preparation Science, Faculty of materials science and chemical engineering, Ningbo University, Ningbo, 315211, PR China.

A novel macroporous resin was prepared from an epoxy resin and triethylenetetramine (TETA) via a polymerization using micro-phase separation. In this novel method the polyethylene glycol (PEG-400) was used as solvent in the initial stage and a phase-separation reagent at later stage of the polymerization was firstly adopted. The resin was modified by sodium chloroacetate and the carboxyl groups were introduced. Read More

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October 2007

Method validation for the determination of lead in raw cow's milk by electrothermal atomic absorption spectrometry.

Ann Chim 2007 Oct;97(10):983-93

TUBITAK/ATAL Scientific and Technological Research Council of Turkey/Ankara Test and Analysis Laboratory, Beşevler, Ankara 06530, Turkey.

In this study, lead in raw cow's milk has been determined by validated electrothermal atomic absorption spectrometry (ETAAS) with Zeeman-effect background correction. Maximum pyrolysis and optimum atomization temperatures of lead were determined in the presence of modifiers. Pd + Mg(NO3)2 has been found a powerful modifier mixture for the determination of lead. Read More

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October 2007

Highly selective and sensitive spectrophotometric determination of trace amounts of silver ion in surfactant media using 2-mercaptobenzoxazole.

Ann Chim 2007 Sep;97(9):971-82

Chemistry Department Yasouj University Yasouj Iran 75914-353.

A simple and accurate spectrophotometric method for determination of trace amounts of silver ion in tap and wastewater solution and photographic solutions has been described. The spectrophotometric determination of silver ion using 2-mercaptobenzoxazole (MBO) in the presence of Triton X-100 as nonionic surfactant has been carried out. The Beer's law is obeyed over the concentration range of 0. Read More

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September 2007

Mercury(II) ion-selective electrodes based on heterocyclic systems.

Ann Chim 2007 Sep;97(9):959-70

Department of Chemistry, Guru Nanak Dev University, Amritsar-143005, India.

Mercury ion-selective electrodes (ISEs) were prepared with a polymeric membrane based on heterocyclic systems: 2-methylsulfanyl-4-(4-nitro-phenyl)-l-p-tolyl-1H-imidazole (I) and 2,4-diphenyl-l-p-tolyl-1H-imidazole (II) as the ionophores. Several ISEs were conditioned and tested for the selection of common ions. The electrodes based on these ionophores showed a good potentiometric response for Hg2+ ions over a wide concentration range of 5. Read More

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September 2007

Synthesis and acid digestion of biomorphic ceramics: determination of alkaline and alkaline earth ions.

Ann Chim 2007 Sep;97(9):947-58

Department of Analytical Chemistry, Faculty of Sciences, University of Málaga, 29071 Málaga, Spain.

Ceramic and glass are some of the more recent engineering materials and those that are most resistant to environmental conditions. They belong to advanced materials in that they are being developed for the aerospace and electronics industries. In the last decade, a new class of ceramic materials has been the focus of particular attention. Read More

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September 2007

Pre-capillary derivatisation and capillary zone electrophoresis for amino acids analysis in beverages.

Ann Chim 2007 Sep;97(9):935-45

Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand.

A simple and rapid method for the simultaneous analysis of amino acids has been developed. Amino acids were derivatised based on pre-capillary derivatisation with 1,2-naphthoquinone-4-sulfonate (NQS) in basic medium (pH 10.0) and developed reaction at 70 degrees C. Read More

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September 2007

A QSPR study on the GC retention times of a series of fatty, dicarboxylic and amino acids by MLR and ANN.

Ann Chim 2007 Sep;97(9):925-33

Chemistry Department, Faculty of Sciences, K. N. Toosi University of Technology, Tehran, Iran.

Quantitative structure-property relationship (QSPR) analysis has been carried out to a series of fatty, amino and dicarboxylic acids to model their GC retention times. A genetic partial least square method (GAPLS) was applied as a variable selection tool. Modeling of retention times of these compounds as a function of the theoretically derived descriptors was established by multiple linear regression (MLR) and artificial neural network (ANN). Read More

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September 2007

Partitioning study of polycyclic aromatic hydrocarbons between water and some selected water-insoluble phases.

Ann Chim 2007 Sep;97(9):915-24

Dipartimento di Chimica e Tecnologie Farmaceutiche, Università di Palermo, via Archirafi n.32, 90123 Palermo, Italy.

An investigation on the partitioning of naphthalene and phenanthrene between water and some water-insoluble phases has been carried out by Uv-vis-NIR spectrophotometry. The analysis of the experimental results emphasized the role of intermolecular interactions and structural features of the hosting phases as driving forces of the partitioning of these polycyclic aromatic hydrocarbons. The critical comparison of the resulting distribution constants allowed to evaluate the potentials of some extracting phases to set up sensitive analytical methods and/or effective environment remediation technologies. Read More

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September 2007

Analysis of pigments from Roman wall paintings found in the "agro centuriato" of Julia Concordia (Italy).

Ann Chim 2007 Sep;97(9):905-13

Department of Physical Chemistry, University Ca' Foscari of Venice, Calle Larga S. Marta 2137, 30123 Venice, Italy.

The analysis of wall painting fragments recovered in the "agro centuriato" of Julia Concordia has been carried out by using Scanning Electron Microscopy equipped with an EDS microanalysis detector (SEM-EDS), Infrared Spectroscopy (FTIR) and X-Ray powder Diffraction (XRD). The pigments used have been identified and the data obtained suggest the presence of three rustic villas richly decorated also with Egyptian blue. The presence of white of aragonite suggest that these villas were decorated during the Imperial Age, in agreement with the recovery of high quality materials and a bronze statue. Read More

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September 2007

Iodine status and the effect of soil erosion on trace elements in Nanka and Oba towns of Anambra State, Nigeria.

Ann Chim 2007 Sep;97(9):895-903

Department of Applied Biochemistry, Nnamdi Azikiwe University, Awka.

Iodine Deficiency Disorders (IDD) is common in all populations. Iodine and other trace elements naturally occur in the soil but erosion leaches off these elements from the soil. This results in a continued loss of trace elements from the soil. Read More

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September 2007

Identification of a bioactive impurity in a commercial sample of 6-methyl-2-p-tolylaminobenzo[d][1,3]oxazin-4-one (URB754).

Ann Chim 2007 Sep;97(9):887-94

Istituto di Chimica Farmaceutica e Tossicologica, Università degli Studi di Urbino Carlo Bo, Piazza del Rinascimento 6, 61029 Urbino, Italy.

The compound URB754 was recently identified as a potent inhibitor of the endocannabinoid-deactivating enzyme monoacylglycerol lipase (MGL) by screening of a commercial chemical library. Based on HPLC/MS, NMR and EI/MS analyses, the present paper shows that the MGL-inhibitory activity attributed to URB754 is in fact due to a chemical impurity present in the commercial sample, identified as bis(methylthio)mercurane. Although this organomercurial compound is highly potent at inhibiting MGL (IC50 = 11. Read More

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September 2007

ICP-MS determination of trace elements in aerosols using a dynamic reaction cell: first results in PM10 comparing road and aerial traffic in Nice area (France).

Ann Chim 2007 Sep;97(9):875-85

Laboratoire de Radiochimie, Sciences Analytiques et Environnement, Université de Nice Sophia-Antipolis, Faculté des Sciences, parc Valrose, 06108 Nice, France.

An analytical methodology was developed for the determination of 21 trace elements in suspended particulate matter (PM) using a microwave digestion procedure associated with an inductively coupled plasma mass spectrometry (ICP-MS). The dynamic reaction cell (DRC) of the instrument was carefully optimized to eliminate polyatomic species causing spectral interferences for three specified elements (Cr, Fe, Mn). With this method, the detection limits based on the analysis of seven quartz fibre filters (QFF) considering a one-week sample (250 m3) varied between 0. Read More

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September 2007

Heavy metal levels and physico--chemical quality of potable water supply in Warri, Nigeria.

Ann Chim 2007 Sep;97(9):867-74

Pure & Industrial Chemistry Department, Nnamdi Azikiwe University, P.M.B, 5025 Awka, Anambra State, Nigeria.

The interaction between man's activities and the environment is gaining world wide attention. Warri an oil producing community in Delta State of Nigeria is faced with environmental oil pollution. Since open and underground water bodies are regarded as final recipients of most environmental pollutants, this study sought to provide data on the levels of the physico-chemical parameters and contaminants in Warri metropolitan water supply. Read More

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September 2007

Identification of organic compounds in fictile unguentaria from two Sicilian necropolis of Greek age (5th century, b.c.) by GC-MS analysis.

Ann Chim 2007 Sep;97(9):859-65

Dipartimento di Chimica e Tecnologie Farmaceutiche, Università di Palermo, via Archirafi 32, 1-90123 Palermo, Italy.

A study to obtain more knowledge on funeral set in Greek age, (5th Century, b.c.) was carried out on thirteen ancient unguentaria, small vessels used as containers of balms or ointments, founded in two different Sicilian necropolis: Adranon and Hymera. Read More

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September 2007

Parafac and PLS applied to determination of captopril in pharmaceutical preparation and biological fluids by ultraviolet spectrophotometry.

Ann Chim 2007 Sep;97(9):845-58

Department of Chemistry, Faculty of Sciences, Azad University of Arak, Arak, Iran.

A new ultraviolet spectrophotometric method has been developed for the direct qualitative determination of captopril in pharmaceutical preparation and biological fluids such as human plasma and urine samples. The method was accomplished based on parallel factor analysis (PARAFAC) and partial least squares (PLS). The study was carried out in the pH range from 2. Read More

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September 2007

Chemical composition and antimicrobial activity of some oleogum resin essential oils from Boswellia spp. (Burseraceae).

Ann Chim 2007 Sep;97(9):837-44

Dipartimento di Chimica e Tecnologie Farmaceutiche, Università degli Studi di Palermo, Palermo, Italy.

The chemical composition of Boswellia carteri (Somalia), B. papyrifera (Ethiopia), B. serrata (India) and B. Read More

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September 2007

Highly selective and sensitized spectrophotometric determination of iron (III) following potentiometric study.

Ann Chim 2007 Sep;97(9):823-36

Chemistry Department Yasouj University Yasouj Iran 75914-353.

A simple, selective and sensitized spectrophotometric method for determination of trace amounts of Fe3+ ion in tap and waste water solutions has been described. The spectrophotometric determination of Fe3+ ion using Ferron in the presence of N,N-Dodecytrimethylammonium bromide (DTAB) has been carried out. The Beer's law is obeyed over the concentration range of 0. Read More

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September 2007

Analysis of Roman wall paintings found in Verona.

Ann Chim 2007 Sep;97(9):807-22

Dept. of Physical Chemistry, University Ca' Foscari of Venezia, Calle Larga S. Marta 2137, 30123 Venice, Italy.

The present paper deals with the analysis of roman wall paintings fragments recovered from twelve buildings of Verona, Italy. The analytical techniques used were Optical Microscopy, Scanning Electron Microscopy (SEM) equipped with an EDS microanalysis detector, Xray powder diffraction (XRD) Fourier Transform infrared spectroscopy (FTIR) and Raman Spectroscopy. The wall preparation generally consisted of three layer: the pictorial layer, an intonachino layer of hydrated lime and a plaster one made of slaked lime and sand. Read More

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September 2007