XANES spectroscopy studies of Cr(VI) reduction by thiols in organosulfur compounds and humic substances

Article Abstract:

Hexavalent chromium is an oxidant that is able to be reduced several ways, however, soil humic substances such as sulfur may demonstrate hexavalent chromium reducing capacity when sulfur organic compounds contain it in its reduced form as thiol groups. Most of the sulfur content in soil is present in organic forms in the temperate climates. Chromium X-ray absorption near-edge structure spectroscopy can determine the total percentage of chromium present as hexavalent chromium.

United States, Science & research, Chromium Compounds, Statistical Data Included, Usage, Testing, Chemical industry, Illustration, Soil chemistry, Sulfur compounds

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Arsenate and chromate retention mechanisms on goethite. 2. Kinetic evaluation using a pressure-jump relaxation technique

Article Abstract:

A study aimed at determining the kinetics of arsenate and chromate adsorption/desorption on goethite (alpha-FeOOH) with the use of a pressure-jump (p-jump) relaxation technique is presented. The relaxation technique allowed a thorough examination of arsenic and chromium's effect in the environment. The procedure for the adsorption of arsenate and chromate on goethite is a two-step process that results in the formation of an inner-sphere bidentate surface complex. The results indicate that chromate proves to be more mobile than arsenate in soil systems.

Arsenic & Compounds, Analysis, Environmental aspects, Chemical reaction, Rate of, Chemical kinetics, Arsenic, Relaxation methods (Mathematics)

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Humic acid binding of trivalent Tl and Cr studied by synchronous and time-resolved fluorescence

Article Abstract:

Synchronous and time-resolved fluorescence techniques proved useful in the investigation of low concentration metal ion-humic acid (HA) interactions. Comparable values of intrinsic binding constants for Tl(III) and Cr(III), regardless of pH, metal:ligand ratio and fluorescence method used, were obtained with the use of an electrostatic discrete site approach. Tl(III) and Cr(III) complexation results also revealed that other species may also bind to humic acids beside the aquo ion and the first hydroxo complex.

Research and Development in the Physical, Engineering, and Life Sciences, Water Pollution Control R&D, Thallium Compounds, Fluorescence, Water pollution, Water pollution research, Thallium

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