研究报告
汤嘉骏,刘昕宇,詹志薇,解启来,李斌,徐晨,贾妍燕.流溪河水体有机氯农药的生态风险评价[J].环境科学学报,2014,34(10):2709-2717
流溪河水体有机氯农药的生态风险评价
- Ecological risk assessment of organochlorine pesticides OCPs in water of Liuxi River
- 基金项目：水利部948项目(No.201111)
- 作者
- 单位
- 汤嘉骏
- 华南农业大学资源环境学院,广州 510640;土壤环境与废物资源农业利用广东高校重点实验室,广州 510640
- 刘昕宇
- 华南农业大学资源环境学院,广州 510640;珠江流域水环境监测中心,广州 510611
- 詹志薇
- 华南农业大学资源环境学院,广州 510640;东莞市环境保护局,东莞 523009
- 解启来
- 华南农业大学资源环境学院,广州 510640;土壤环境与废物资源农业利用广东高校重点实验室,广州 510640
- 李斌
- 华南农业大学资源环境学院,广州 510640;土壤环境与废物资源农业利用广东高校重点实验室,广州 510640
- 徐晨
- 华南农业大学资源环境学院,广州 510640;土壤环境与废物资源农业利用广东高校重点实验室,广州 510640
- 贾妍燕
- 华南农业大学资源环境学院,广州 510640;土壤环境与废物资源农业利用广东高校重点实验室,广州 510640
- 摘要：通过检测流溪河水体18个采样点水样中的有机氯农药浓度,构建了淡水生物对有机氯农药的物种敏感性分布,并计算出各类水生生物的HC5(Hazardous Concentration for 5% the Species)值,预测了不同浓度有机氯农药对生物的潜在影响比例(Potential Affected Fraction,PAF),最后采用商值概率分布法对流溪河水体的有机氯农药进行了生态风险评价.结果表明:流溪河水体中的有机氯农药浓度在216.41~389.70 ng·L-1之间,平均值为293.02 ng·L -1;甲体六六六(α-BHC)的HC5值最高,而硫丹硫酸酯和p,p'-滴滴滴(p,p'-DDD)对全部物种的HC5值均低于0.10 μg·L-1,对生态系统的影响较大;当污染物的浓度达到0.50 μg·L-1时,除甲体六六六、七氯之外,其余9种有机氯农药对全部物种的PAF值均超过了5%的阈值;除硫丹Ⅱ外,其余10种有机氯农药均具有潜在的生态风险;在假定保护95%物种的情况下,硫丹硫酸酯的生态风险最高.
- Abstract：The concentrations of organochlorine pesticides (OCPs) in water samples (n=18) collected from different sites of Liuxi River were determined using GC-MSD,and the Species Sensitivity Distributions (SSD) of different freshwater organisms exposed to OCPs was established. Based on OCP concentrations and SSD,the hazardous concentration for 5% the species (HC5) of OCPs to freshwater organisms were est-imated,and the potential affected fractions (PAF) of various OCPs concentrations to freshwater organisms were also predicted.In addition,the ecological risk of OCPs in Liuxi River was assessed using quotient probability distribution.The results showed that the total concentrations of OCPs ranged from 216.41 to 389.70 ng · L-1 with a mean value of 293.02 ng · L-1.The HC5 value of α -Benzenehexachloride was very high (12.95 μg · L-1),while the HC5 values of Endosulfan sulfate and p,p'-DDD to freshwater organisms were below 0.10 μg · L-1,which might have large effects on ecological system.When the OCP concentra-tion was 0.50 μg · L-1,the ecological risks of nine OCP compounds (except for α-BHC and Heptachlor) exceeded the 5% thr-eshold.The quotient probability distribution showed that all the OCP compounds (expect for EndosulfanⅡ) have potential ecological risks. Endosulfan sulfate posed the highest risk when 95% species were not affected at 95% confidential level.
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