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Determination of trace amounts of silver(I) in the presence of an activator with a kinetic method

Rare Metals 2014年第6期33卷 731-736页

作者： Shahryar Abbasi Hadi Barzegaramiri Abbas Farmany Department of Chemistry Ilam University Department of Chemistry Islamic Azad University

A simple and sensitive kinetic-spectrophotometric method was developed for the determination of trace amounts of silver, based on its catalytic effect on the oxidation of azocarmine G by peroxydisulfate in sulfuric acid medium and at 30 °C in the presence of 1,10-phenantroline as activator. The absorbance was measured at 525 nm with the fixed-time method. The optimization of the operating conditions regarding concentrations of the reagents, temperature, ionic strength, and interferences was also investigated. The calibration curve is linear over the concentration range 0.3–50.0 ng ml-1of silver with good precision and accuracy, and the detection limit is down to0.125 ng ml-1. The relative standard deviation for a standard solution of 25.0 ng ml-1of silver is 1.36 %（n = 10）.The proposed method proves to be highly sensitive,selective, and relatively rapid for the assay of silver at lowlevel range of 0.3–50.0 ng ml-1without any pre-concentration and separation step. The method was applied for the determination of silver in river water and white photographic film. The analytic results of the real samples are in excellent agreement with atomic absorption spectrometry analysis. The analytical results obtained are satisfactory.

关键词： Silver Kinetic-catalytic determination Azocarmine G Activator 1,10-phenantroline

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[Cu(2,2'-bpy)Cl_2]和[Cu(1,10-phen)Cl_2]在多金属氧酸盐上的多相化:选择性氧化四氢化萘的新催化剂(英文)

引用

催化学报 2011年第5期32卷 807-811页

作者： M. BOLTZ A. BLANC G. LAUGEL P.PALE B. LOUIS Laboratoire de Synthkse et Reactivite Organiques Institut de Chimie UMR 7177 CNRS Universitd de Strasbourg 4 rue Blaise Pascal 67000 Strasbourg Cedex France

Mononuclear Cu(II)bipyridine(1)and phenantroline complexes(2)were synthesized and immobilized by different procedures on H3PW12O40 polyoxometalate(POM).Characterization by XRD and SEM-EDX were performed to assess the preservation of the Keggin structure and stoichiometry of the *** immobilized complexes were tested as heterogeneous catalysts for the partial oxidation of tetralin(1,2,3,4-tetrahydronaphthalene)using hydrogen peroxide as oxidant in acetonitrile/water as solvent.[Cu(2,2'-bpy)Cl][H2PW12O40] and[Cu(1,10-phen)Cl][H2PW12O40]oxidized tetralin at room temperature,with 16%conversion with(2),to 1-tetralone and 2-tetralone with 83%***,the selectivity for 1-tetralone was only 56%.Different preparation methods for the heterogenization of these complexes on the POM Keggin unit were compared and used to enhance the selectivity to 1-tetralone to 75%.

关键词： tetralin partial oxidation Cu(II)complexes 2,2’-bipyridine 1,10-phenantroline hydrogen peroxide polyoxometalate

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