淮河沉积物中有机氯农药的残留与风险评价

采用GC-ECD对淮河江苏段表层沉积物中16种有机氯农药(OCPs)残留进行测定. 结果表明，有机氯农药在所有样品中均有检出，w(OCPs)为8.88～16.22 ng/g；组分分布特征分析表明，六六六类(Hexachlorocyclohexanes，HCHs)农药的来源可能与早期土壤的残留或大气远距离输送有关，滴滴涕类(DDTs)污染除了来自早期土壤残留外，近期可能有新的含DDTs农药成分的物质输入；相关性分析揭示总有机碳(TOC)是影响沉积物中有机氯农药分布的重要原因；与国内不同地区沉积物中有机氯农药残留相比，淮河江苏段有机氯农药污染水平中等；与淡水水域沉积物质量标准对照发现，其对水生底栖生物危害风险较低. 

Residues and Risk Evaluation of Organochlorine Pesticides in Sediments from Huaihe River

Concentrations of 16 organochlorine pesticides (OCPs) residues in sediments from Jiangsu section of Huaihe River, China, were determined using gas chromatography coupled by ECD detector (GC-ECD). The level range of OCPs in sedimentswas 8.88～16.22 ng/g. Analysis of distribution characteristics of components showed that HCHs were mainly the early residue in sediment and remote atmosphere pollutant transport. DDTs residues in sediments were not only related to the earlyresidues in environment, but also related to input of DDTs components in near term. According to correlation analysis between OCPs and TOC, TOC content influences the distribution of OCPs in sediment strongly. Compared with other region, the contamination level of OCPs in sediment of Huaihe River was middle. According to sediment quality guidelines for freshwater ecosystem, OCPs impose relatively lower ecological risk on sediment-dwelling organisms.