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利用固相萃取-气相色谱-质谱联用技术(SPE-GC-MS)检测了粤桂水源地7个采样点水样中16种有机氯农药(OCPs)的浓度,分析了研究区OCPs的污染特征;利用BurrⅢ型分布构建了8种OCPs的物种敏感度分布曲线,并计算出不同OCPs对淡水水生生物的HC5(hazardous concentration for 5%species)值,最后应用安全阈值法评价了OCPs对水生生物的生态风险.结果表明,OCPs的浓度在6.64~34.19 ng·L~(-1)之间,平均值为16.76 ng·L~(-1),HCHs和DDTs及其降解产物在污染物中的贡献比例较大.HCHs主要来自家庭杀虫剂中的林丹,DDTs主要来自三氯杀螨醇的污染或历史残留.脊椎动物对OCPs的耐受性高于无脊椎动物,α-硫丹对水生植物和微生物的影响较大,p,p’-DDT对脊椎动物和无脊椎动物的影响较大.粤桂水源地OCPs对水生生物没有显著的生态风险,但DDTs和α-硫丹对水生生物存在较高的潜在风险,应加以重视.
The concentrations of 16 organochlorine pesticides (OCPs) in seven sample water samples from the water sources of Yue and Gui were detected by SPE-GC-MS. The contamination of OCPs in the study area was analyzed The distribution of species sensitivity of eight species of OCPs was constructed by Burr Ⅲ distribution and the concentration of HC5 (hazardous concentration for 5% species) of freshwater aquatic organisms was calculated with different OCPs. Finally, the safety threshold method was used to evaluate the sensitivity of OCPs to aquatic organisms The results showed that the concentrations of OCPs ranged from 6.64 to 34.19 ng · L -1 with an average value of 16.76 ng · L -1. The HCHs, DDTs and their degradation products in contaminants HCHs mainly come from lindane in domestic pesticides, DDTs mainly come from the pollution or historical residues of dicofol.People’s vertebrates have higher tolerance to OCPs than invertebrates, and α-endosulfan to aquatic plants and microorganisms The effect of p, p’-DDT on vertebrates and invertebrates is relatively large.OCPs in Guangdong and Guangxi have no significant ecological risk to aquatic organisms, but DDTs andα-endosulfan have higher aquatic life Potential risks should be taken seriously.