海河河口水和新港港湾水中α-六六六对映体选择性降解及α、β、γ、δ-六六六浓度

Enantioselective breakdown of α Hexachlorocyclohexane(HCH) and concentrations of α、β、γ、δ HCH isomers in Xingang Harbour marine water and Haihe River estuary water of Tianjin.

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（ＧＢ３０９７８２）和生活饮用水水质标准（ＧＢ５７４９８５）。

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.