渤海湾主要入海河流入海口沉积物有机氯农药污染特征及其来源分析

Distribution Characteristics and Sources of OCPs in Estuary Sediments of Main Runoff Flowed into Bohai Bay,China

本文以渤海湾主要入海河流(蓟运河、永定新河、大沽河、独流减河、子牙新河、北排河)入海河口为研究区域,利用超声提取技术,使用气相色谱-电子捕获检测器(GC-ECD)方法测定了样品中的有机氯农药的含量。研究结果表明,上述主要入海河流河口沉积物的OCPs含量在34.0～518.3 ng.g-1之间(以干质量计),以大沽河的污染最为严重。各河流的主要OCPs分布模式不同,其中永定新河、子牙新河OCPs污染以DDTs为主,蓟运河和北排河则以HCHs为主,独流减河七氯污染最为严重。与国内外其他地区沉积物相比,该地区沉积物中OCPs污染处于较高水平。主成分分析结果表明主要入海河流中都存在着OCPs的近期输入。

This work is focus on the occurrence and distribution of organochlorine pesticides （ OCPs ） in sediment, which are collected from the major Bohai sea-going rivers including Jiyun, Yongdingxin, Dagu, Duliujian, Ziyaxin and Beipai River. The analytes were ultrasonic extracted and determined by gas chromatography-electron capture deteetor（GC-ECD ）. The results indicated that the concentrations of OCPs in the sediment varied from 34.0 ng·g-1 to 518.3 ng·g-1, and the highest value was found in Dagu River. The results also suggested different distribution patterns of OCPs in the sediments from these rivers, for example, DDTs were the main components in Yongdingxin River and Ziyaxin River, HCHs dominated in Jiyun River and Beipai River, heptaehlor regnant dominated in Duliujian River compared with those in other national or international regions. The concentrations of OCPs in soils from estuary sediments of main runoff flowed into Bohai Bay were higher. It could be concluded that soil OCPs levels were relatively high in this area. In addition, results from principal components analysis disclosed newly inputs of OCPs into the rivers.