摘要
运用全甲基化β环糊精毛细管气相色谱手性柱,首次测定了我国天然水体中手性污染物α六六六的对映体浓度比值〔ER=(+)α六六六/(-)α六六六〕。初春和初夏季节天津新港港湾海水中α六六六的ER值为0.91~0.80,证实了该水体微生物对α六六六的降解存在着对映体选择性,(+)α六六六被优先降解。海河河口水在以上两季节中,α六六六的ER值均近似为1,其原因有待于进一步研究,可能是附近有经常排放外消旋体α六六六的污染源。另外还测定了以上两水体中α、β、γ、δ六六六的浓度,两水体中的六六六含量分别符合我国I类海洋水质标准(GB309782)和生活饮用水水质标准(GB574985)。
猅he enantiomeric ratios(ER=(+)α HCH/(-)α HCH)of the chiral pollutant α Hexachlorocyclohexane(HCH)were determined in Xingang Harbour marine water and Haihe River estuary water for the first time by means of capillary gas chromatography using permethylated β cyclodextrin as chiral stationary phase. The ERs of α HCH in the marine water vary from 0.91to 0.80 in early spring and early summer, indicating that the marine microbial degradation of α HCH has enantioselectivity and (+)α HCH is degraded preferentially. However, the ERs of α HCH in the estuary water are almost 1. The reason remains to be investigated further. It is caused propably by the constant input of racemic α HCH from a nearby pollution source. The concentrations of α、β、γ、δ HCH in both waters were also determined. The total HCH concentration of these two waters met the National Marine Water Quality Standard I (GB3097 82)and the National Drinking Water Quality Standard(GB5749 85) respectively.
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
1998年第3期197-201,共5页
China Environmental Science
基金
高等学校博士点科研专项基金
关键词
手性污染物
六六六
对映体选择性
降解
水质监测
chiral pollutant Hexachlorocyclohexane enantiomeric ratio enantioselective breakdown