长江入海口浅层沉积物中典型有机氯农药分布特征
The Distribution Characteristics of Typical Organochlorine Pesticides in Shallow Sediments of the Yangtze River Estuary
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摘要: 对长江入海口包括江苏启东,上海崇明岛、长兴岛、横沙岛等地区的浅层沉积物中典型有机氯农药(OCPs)的分布情况进行了研究。采用气相色谱-电子捕获检测器进行检测,方法检出限为0.10 ng/g,回收率为62.4%~116.7%,精密度(RSD)为2.7%~8.3%。调查分析结果显示,长江入海口沿岸均存在轻度和中度的OCPs污染,主要检出物总滴滴涕(DDTs)浓度范围为1.22~626.43 ng/g。深度(0~80 cm)采样检测结果表明,研究区表层及深度样品中DDTs均有不同程度检出,浅层沉积物中DDTs在0~20 cm区域占检出总量的58.1%;其次是20~40 cm区域,DDTs占总量的30.8%;40~60 cm区域DDTs占总量的8.2%;60~80 cm区域DDTs占总量的2.9%,即浅层沉积物中DDTs主要集中在0~40 cm区域,部分点位40~80 cm能够检出少量DDTs。本研究提供的数据为该地区OCPs垂直分布提供参考。Abstract: The typical organochlorine pesticides (OCPs) distribution of the Yangtze River estuary was studied for shallow sediments from Qidong Jiangsu, Chongming Island, Changxing and Hengsha Island Shanghai. The detection limit is 0.10 ng/g, the recovery of samples are 62.4%-116.7% and the relative standard deviation (RSD) are 2.7%-8.3% by using Gas Chromatography equipment with electron capture detector (ECD). Research results indicate that mild and moderate contamination of OCPs did exist along the coast of Yangtze River estuary and the mainly detected total DDTs ranged from 1.22 to 626.43 ng/g. The results show that DDTs had been detected at the depth of 0-80 cm. DDT distributions in shallow sediments at the depth of 0-20 cm, 20-40 cm, 40-60 cm and 60-80 cm are 58.1%, 30.8%, 8.2% and 2.9% of the total contents, respectively. The DDTs are primarily distributed at depths of 0-40 cm in shallow sediments. A few DDTs were detected for some samples from 40-80 cm area. The results provide some references for the vertical profile of OCPs in this region.
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