某河流河口污染沉积物取样研究与特征分析

Sampling and Characteristic Analysis of Contaminated Sediments in a River Estuary

针对河口地区日益恶化的生态问题,设计开发了对某河流河口地区污染沉积物进行多位点、多层次的取样分析系统,并根据国内现有标准规范制定了污染程度判定依据,同时研究了该河口污染沉积物特征对河口污染的影响。结果表明,污染该地区的主要超标源为DDT和六六六。DDT浓度在整个采样深度内始终维持较高的水平,最高可达1.51 mg/kg,超标位点占全部测量位点的60%。六六六分布形式与DDT相同,最高浓度达1.89 mg/kg。通过对这2种污染物的特征分析,推进了河口地区的生态恢复工程建设。

Aiming at the deteriorating ecological problems in estuary areas,a multi-point and multi-level sampling and analysis system for contaminated sediments in a river estuary area was designed and developed.According to the existing domestic standards,a criterion for determining the pollution degree was established,and influence of the characteristics of the contaminated sediments on estuary pollution was studied.The main sources of pollution in the region were dichlorodiphenyltrichloroethane(DDT)and benzene hexachloride(BHC).The DDT concentration was maintained at a high concentration level throughout the sampling depth.The maximum DDT concentration was up to 1.51 mg/kg,and the over-standard sites accounted for 60%of all the measured sites.The distribution pattern of BHC was the same as DDT,and the maximum concentration was 1.89 mg/kg.Through analysis of the characteristics of these two pollutants,the ecological restoration project in the estuary area had been promoted.