Effect of cadmium on reductive dechlorination of trichloroaniline

Journal Article · Mon Jul 01 04:00:00 EDT 1996 · Environmental Toxicology and Chemistry

DOI:https://doi.org/10.1002/etc.5620150710· OSTI ID:268012

Pardue, J H; Kongara, S ^[1]; Jones, W J ^[2]

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1. Louisiana State Univ., Baton Rouge, LA (United States). Wetland Biogeochemistry Inst.
2. Environmental Protection Agency, Athens, GA (United States). Environmental Research Lab.

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 {micro}g/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 {micro}g/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.

• Sponsoring Organization: USDOE
• OSTI ID: 268012
• Journal Information: Environmental Toxicology and Chemistry, Journal Name: Environmental Toxicology and Chemistry Journal Issue: 7 Vol. 15; ISSN ETOCDK; ISSN 0730-7268
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
BENCH-SCALE EXPERIMENTS
BIODEGRADATION
CADMIUM
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
CHLORINATED ALIPHATIC HYDROCARBONS
INTERSTITIAL WATER
LAND POLLUTION
REMEDIAL ACTION
SOILS