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Degradation of selected halogenated ethanes in anoxic sediment‐water systems
Author(s) -
Jafvert Chad T.,
Lee Wolfe N.
Publication year - 1987
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620061102
Subject(s) - sediment , anoxic waters , chemistry , environmental chemistry , degradation (telecommunications) , lindane , halogenation , kinetics , vicinal , reactivity (psychology) , organic chemistry , pesticide , geology , ecology , paleontology , telecommunications , physics , quantum mechanics , computer science , biology , medicine , alternative medicine , pathology
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 (DIA) 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 ⋍ DIA > DBA > TTCA > DCA.