【摘要】 北江作为清远市居民的主要生活饮用水水源,水体中持久性有机污染物污染问题备受重视,但目前对于北江清远段水体中酞酸酯的研究较少。了解OCPs的分布、来源及健康、生态风险,对于保障北江清远段居民的饮用水安全,给北江水生态环境保护管理提供技术支持具有重要参考意义。2016年7月和12月于北江清远段采集40个水和表层沉积物样品,采用高分辨气相色谱-高分辨质谱联用仪（HRGC-HRMS）法测定了样品中的有机氯农药（Organochlorine Pesticides,OCPs）,分析了北江清远段水环境中OCPs的残留特征,并进行了健康和生态风险评估。结果表明,北江清远段水和沉积物中OCPs的残留较少,检出率低。丰枯两季水中仅有异狄氏剂（Endrin）和六氯苯（HCB）2种化合物被检出,丰水期水中ΣOCPs质量浓度为0.25-12 ng·L^-1,枯水期水中ΣOCPs质量浓度为nd（表示未检出）-3.29 ng·L^-1;沉积物中5种目标化合物:HCB、六六六（γ-HCH）、狄氏剂（Dieldrin）、滴滴伊（p,p’-DDE）、滴滴涕（o,p’-DDT）被检出,丰水期沉积物中∑OCPs质量分数为0.14-5.58ng·g^-1,枯水期沉积物中∑OCPs质量分数为0.02-2.16ng·g^-1。OCPs的污染源解析结果表明,沉积物中DDT为历史残留导致,γ-HCH来源于杀虫剂林丹。致癌风险和非致癌风险评价结果表明,北江清远段水中OCPs对人体均未达到致癌风险。采用淡水沉积物环境质量基准法和效应区间中低值法评价沉积物中OCPs生态风险,发现丰水期BJ-1、BJ-4、BJ-6采样点对水生动物产生不良反应。更多还原

【Abstract】 Beijiang River, the primary source of drinking water for residents in Qingyuan, has received increasing attention for its Persistent Organic Pollutants（POPs） pollution conditions. However, a small number of studies on Organochloride Pesticides（OCPs） in surface water of Qingyuan section have been reported. Understanding the distribution and sources of OCPs as well as the health and ecological risk will significantly help for ensuring the drinking water safety of residents, and providing technical support for the protection and management of the ecological environment in the Qingyuan section of Beijiang River. In July and December 2016, 40 water and surface sediment samples were collected from the Qingyuan section of Beijiang River. The isotope dilution HRGC/HRMS method was applied to detect the OCPs in the samples, and the residual characteristics of OCPs in Beijiang River was analyzed while the health and ecological risk was evaluated. The results shows that the OCPs in water and sediments samples from Qingyuan section of Beijiang River was scarcely detected while the residual level was low. In both flood and dry season, only HCB and Endrin were detected in water samples, particularly the concentration of OCPs in water ranged from 0.25 to 12 ng·L^-1 in flood season, and ND（ND indicated undetected） to 3.29 ng·L^-1 in dry season. In sediment samples, HCB, p, p’-DDE, o, p’DDT, Dieldrinand,γ-HCH were detected, and the ∑OCPs ranged from 0.14 to 5.58 ng·g^-1 in flood season and 0.02 to 2.16 ng·g^-1 in dry season. The result shows that γ-HCH in sediments originated from pesticides using, and the detection of DDT might attributed to historical residues. The carcinogenic risk from OCPs in the Qingyuan section of Beijiang River can be neglected. The ecological risk of OCPs in freshwater sediments was assessed by the benchmark method of environmental quality of freshwater sediments and the mid-low value method of effect interval, with the result of the sampling points of BJ-1, BJ-4 and BJ-6 had adverse effects on aquatic animals during the flood season.更多还原