Abstract
The reductive dehalogenation of chloroanilines (CAs) was investigated in anaerobic sediment/water systems. The sulfate content of the interstitial and overlaying waters was approximately 20 mmoles l−1 and the sediment was apparently sulfidogenic. The CAs exhibited first-order disappearance kinetics with the rate constants ranging from 0.012–0.005 day−1 or half-lives between 40 and 672 days. Pentachloroaniline (PeCA), 2,3,4,5-tetrachloroaniline (2,3,4,5-TeCA) and 3,4,5-trichloroaniline (3,4,5-TCA) were transformed by the sequential removal of halogen from the para and ortho positions. The disappearance of the parent compound and accumulation of metabolites were simulated using a first-order branched kinetic model.
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