Effect of temperature, ionic strength, background electrolytes, and Fe(III) on the reduction of hexavalent chromium by soil humic substances

Article Abstract:

Chromium (Cr) is a radioactive compound present in industrial wastes. The mobility and toxicity of Cr depend on the processes governing its transport and transformation in the environment. A study on hexavalent Cr reduction by soil humic substances has shown that ionic strength, background electrolytes and the presence of ferric iron, Fe(III), influence the rates of reduction of hexavalent Cr. Temperature determined the activation enthalpies and activation entropies of the reaction.

Analysis

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Reduction of Cr(VI) in the presence of excess soil fulvic acid

Article Abstract:

The rate of the reduction of Cr(VI) by a soil fulvic acid (SFA) was examined to determine the effect of pH, Cr(VI) concentration and SFA concentration on the CR(VI) reduction rates. Results revealed that Cr(VI) is reduced by SFA in aqueous solutions having a pH value between 1-7. The rate of reduction, which increases as pH decreases and as SFA and Cr(VI) concentration increases, was found to be nonlinear and cannot be characterized by mere first- or second-order rate equations.

Influence, Environmental aspects, Fulvic acids, Chemical reaction, Rate of, Chemical kinetics, Soil acidity

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Precipitates in a Cr(VI)-contaminated concrete

Article Abstract:

A research report examines chromium crystals in contaminated concrete taken from a hard-chrome plating shop.

United States, Science & research, Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Chromium, Statistical Data Included, Concretes, Pollution, Illustration, Concrete

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