Effect of cadmium on reductive dechlorination of trichloroaniline

Document Type

Article

Publication Date

1-1-1996

Abstract

The effect of a transition metal, cadmium (Cd), on reductive dechlorination of a model chlorinated organic, 2,3,4-trichloroaniline (2,3,4- TCA), was determined in the laboratory in three anaerobic, flooded soils with varying properties. Dechlorination of 2,3,4-TCA was inhibited over a continuum of pore water-soluble Cd concentrations (10-200 μg/L) in mineral dominated rice paddy and bottomland hardwood soils. In organic-dominated marsh soil, however, a critical inhibitory level of pore-water-soluble Cd (200 μg/L) was observed. Lower-chlorinated aniline metabolites differed with soluble Cd concentration. Different metabolites (2,3-dichloroaniline and 2- chloroaniline) were observed in some soils as Cd neared the completely inhibitory concentration. Speciation of soluble Cd was necessary to predict whether inhibition would occur, particularly in the presence of high concentrations of organic ligands such as humic acids. Selective extractions and measurement of acid volatile sulfides provided additional information but did not adequately predict inhibition of dechlorination. These results demonstrate the importance of quantification and speciation of pore-water metal concentrations in predicting potential inhibition of anaerobic biodegradation reactions such as reductive dechlorination.

Publication Source (Journal or Book title)

Environmental Toxicology and Chemistry

First Page

1083

Last Page

1088

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