福建省光泽地区地表水与地下水中硅氧烷类污染物迁移关联分析

Study on Migration and Correlation Relationships of Cyclosiloxanes in Surface Water and Underground Water of Guangze,Fujian Province

地表径流与地下水作用带中的水流途径复杂,有机污染物在地表水与地下水之间的迁移规律还尚未明晰。本文通过采集福建省光泽县新丰周边河段的地表水与沿途地下水样品,使用气相色谱-质谱(gas chromatography-mass spectrometry,GC-MS/MS)全扫模式对样品中有机污染物的种类与化学结构进行探究,在一定程度上提升污染物溯源的准确性。结果表明:地表水样品中污染物多样性均低于地下水污染物多样性,地下水中有机污染物种类更加丰富。其中,占丰度主导的污染物是环硅氧烷类物质,如六甲基环三硅氧烷、八甲基环四硅氧烷和反式-(2-氯乙烯基)二甲基乙氧基硅烷等。相关性分析结果显示,多个点位的地表水与地下水的污染物组成方面均存在显著相关性,表明地表水可能与地下水之间存在一定的物质交流与溶质交换过程。

The water flow pathway between runoff and underground water is complex and the pattern of transport of organic pollutants between surface water and underground water is still not clear.By collecting the surface water and underground water samples from Guangze,Fujian Province and using gas chromatography-tandem mass spectrometry(GC-MS/MS),the type and chemical structure of pollutants were studied and the accuracy of contaminant traceability was improved.The diversity of pollutants in surface water was less than that in underground water.The variety of pollutants in underground water samples was greater.The abundance dominant pollutants were cyclosiloxanes,including Hexamethylcyclotrisiloxane(D3),Octamethylcyclotetrasiloxane(D4),and Diethoxydimethylsilane,et al.The correlation analysis results displayed the possibility of material exchange and solute exchange between surface water and underground water.