青木关地下河中溶解态甾醇来源及迁移、转化特征

为阐述溶解态甾醇在地下河中的来源及迁移、转化过程和对水质状况评价,2013年7~11月在青木关地下河入口处、出露处和出口处进行定期采样,并利用气相色谱-质谱联用仪(GC-MS)对样品中溶解态甾醇的组分进行定量分析.结果表明,7~11月溶解态甾醇的平均含量变化为415~629 ng·L-1,随月份的增加地下河中溶解态甾醇的含量呈下降的趋势;从地下河入口至地下河出口溶解态甾醇的平均含量变化为724~374 ng·L-1;豆甾醇/胆固醇的平均比值变化为0.29~0.12,随地下河运移距离的增加二者的值均呈下降的趋势.成分组成上以胆固醇含量占优势,约占总含量的37.30%~94.85%,但各月组成变化较大.粪醇/胆固醇、粪醇/甾醇总量的比值均小于0.2,表明没有受到生活污水的污染,但随月份的增加二者比值大致呈增加的趋势.

Sources, Migration and Conversion of Dissolved Sterols in Qingmuguan Underground River

Water samples were collected from the Qinmuguan underground river from July to November in 2013. By gas chromatography-mass spectrometer (GC-MS), dissolved sterols were quantitatively analyzed. The results show that the average variation content of dissolved sterols ranges from 415 to 629ng ·L^-1, with the increasing migration distance of dissolved sterols in underground river, its contents are decreased. Between the inlet and outlet of Qingmuguan underground river, the average variation contents of dissolved sterol are between 724 and 374ng ·L^-1, and the average variation ratios of the content of stigmasterol with cholesterol range from 0.29 to 0.12. In short,their values are decreased accompanied by the increasing migration distance of underground river. The composing component in dissolved sterols varied differently between July to December, and the main component of dissolved sterols is cholesterin, the ratios of the content of dissolved sterols with cholesterin to the total dissolved sterols range from 37.30% to 94.85%. In addition, the ratios of the content of dissolved sterols with coprostanol to cholesterin, coprostanol to cholesterin are below 0.2 respectively, indicating the water quality of underground river is not contaminated by domestic sewage, but with the passage of time water quality tends to deterioration.