ENANTIOSELECTIVE BREAKDOWN OF ALPHA-HEXACHLOROCYCLOHEXANE IN A SMALL ARCTIC LAKE AND ITS WATERSHED

被引：71
作者：
FALCONER, RL
BIDLEMAN, TF
GREGOR, DJ
SEMKIN, R
TEIXEIRA, C
机构：
[1] ATMOSPHER ENVIRONM SERV,DOWNSVIEW,ON M3H 5T4,CANADA
[2] UNIV WATERLOO,WATERLOO CTR GROUNDWATER RES,WATERLOO,ON N2L 3G1,CANADA
[3] ENVIRONM CANADA,CANADA CTR INLAND WATERS,NATL WATER RES INST,BURLINGTON,ON L7R 4A6,CANADA
来源：
ENVIRONMENTAL SCIENCE & TECHNOLOGY | 1995年 / 29卷 / 05期
关键词：
D O I：
10.1021/es00005a023
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Water and snow samples were collected at Amituk Lake on Cornwallis Island to investigate the enantioselective degradation of alpha-hexachlorocyclohexane (alpha-HCH) in the Arctic. The two enantiomers were separated by gas chromatography on permethylated cyclodextrin capillary columns. The enantio- meric ratio (ER = (+)alpha-HCH/(-)alpha-HCH) for an alpha-HCH standard was 1.00 +/- 0.005, which is in excellent agreement with a theoretical ER of 1.00 for unmetabolized alpha-HCH. ERs of snow samples were racemic (0.98 +/- 0.03). Degradation was found in Amituk Lake at 15-21 m where ERs were 0.77 +/- 0.004; however, stream runoff and lake outflow ERs varied considerably during the study. ERs of the outflow traced the meltwater running over the surface of the lake, being close to streamwater values during peak runoff and returning to deep lake water values during low flow. Streamwater ERs decreased within a few weeks of snowmelt and showed a large variability (0.97-0.62), which may be due to the differences in temperature and amount of suspended sediments. The rapid enantioselective breakdown of alpha-HCH suggests that the ability of arctic microbial systems to degrade organic contaminants is greater than commonly thought.
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页码：1297 / 1302
页数：6
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