DEGRADATION OF SELECTED HALOGENATED ETHANES IN ANOXIC SEDIMENT-WATER SYSTEMS
- 1 January 1987
- journal article
- research article
- Published by Oxford University Press (OUP) in Environmental Toxicology and Chemistry
- Vol. 6 (11) , 827-837
- https://doi.org/10.1897/1552-8618(1987)6[827:doshei]2.0.co;2
Abstract
The degradation of selected halogenated ethanes was studied in anoxic sediment-water suspensions at 1 to 20% sediment concentrations. Batch kinetic experiments were used to quantify decay. Eh measurements of all suspensions were below -100 mV (vs SHE), indicating reduced environmental conditions. Hexachloroethane (HCA), 1,1,2,2-tetrachloroethane (TTCA), 1,2-diiodoethane (DNA) and 1,2-dibromoethane (DBA) were degraded within minutes to days, but 1,2-dichloroethane (DCA) remained in the system through 35 d, at which point the study was ended. The major route of transformation of these compounds in this system was vicinal dehalogenation. Rates of disappearance followed pseudo-first-order kinetics at low reactant concentrations and high sediment concentration. The order of reactivity in the same sediment sample followed the sequence, HCA.simeq.DIA>DBA>TTCA>DCA.Keywords
This publication has 1 reference indexed in Scilit:
- Biotransformation of chlorinated organic solvents in static microcosmsEnvironmental Toxicology and Chemistry, 1985