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
Recommended Citation
Pardue, J., Kongara, S., & Jones, W. (1996). Effect of cadmium on reductive dechlorination of trichloroaniline. Environmental Toxicology and Chemistry, 15 (7), 1083-1088. https://doi.org/10.1002/etc.5620150710