武汉市地下水中酞酸酯污染物检测及来源分析

Source Analysis and Detection of Trace Phthalate Esters in Groundwater in Wuhan

在武汉市区长江与汉江交界地带采集了具有代表性的地下水水样。采用固相萃取-气相色谱联用法对样品中的痕量邻苯二甲酸酯污染物进行定性定量分析,方法线性范围1ng/L～1000ng/L,检出限22ng/L～341ng/L。武汉市地下水中邻苯二甲酸酯的检出种类主要包括DBP、DEHP与DIBP等3大类。DBP污染最严重的地点在S1(东西湖区),浓度达1023.8ng/L;DEHP污染最严重的地点在S4(常青花园),浓度达481.0ng/L;DIBP污染最严重的地点在S9(唐家墩),浓度达237.8ng/L。将检测结果与武汉市湖泊水,长江、汉江武汉段,武汉市垃圾填埋场垃圾渗滤液中的PAEs污染物种类及浓度进行对照,并结合采样点周边环境与水文地质条件进行分析。确定了PAEs污染物的土壤淋滤作用,汉江、长江水体对地下水的补给以及垃圾填埋场垃圾渗滤液的渗滤作用是武汉市地下水PAEs污染物的主要来源。

Representative sampies of groundwater at the junction of dte Yangtze River and Hanjiang River in Wuhan urban area were collected. Solid phase extraction coupled with gas chromatography was used to determine trace phthalate esters （PAEs） in groundwater samples, with linear range from 1ng/L to 1,000ng/L, limits of detection with standard solution of 22 -341ng/L under full scan acquisition mode. Results showed that three main species of PAEs were detected in groundwater including DBP,DEHP and DIBP. Concentration of DBP in S1 reached to 1,023.8ng/L, concentration of DEHP in S4 reached to 481.0ng/L and concentration of DIBP in S9 reached to 237.8ng/L. Combined with surrounding environment and hydrogeological conditions of the samples, main source of PAEs pollutants in groundwater were analyzed. Results showed that PAEs leaching role in soil, recharge from Hanjiang River, Yangtze River and groundwater as well as organic pollutants leachate from landfill were three main sources of PAEs in groundwater of Wuhan.