| 新乡市地表水体HCHs和DDTs的分布特征及生态风险评价 |
| 摘要点击 2607 全文点击 1835 投稿时间：2015-02-11 修订日期：2015-03-25 |
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| 中文关键词 HCHs DDTs 新乡市地表水 生态风险 概率密度函数重叠面积法 安全阈值法 |
| 英文关键词 HCHs DDTs surface water from Xinxiang ecological risk overlapping areas of probability density function safety threshold method |
| 作者 | 单位 | E-mail | | 冯精兰 | 河南师范大学环境学院,黄淮水环境污染防治省部共建教育部重点实验室,河南省环境污染控制重点实验室,新乡 453007 | fengjinglan@163.com | | 余浩 | 河南师范大学环境学院,黄淮水环境污染防治省部共建教育部重点实验室,河南省环境污染控制重点实验室,新乡 453007 | | | 刘书卉 | 河南师范大学环境学院,黄淮水环境污染防治省部共建教育部重点实验室,河南省环境污染控制重点实验室,新乡 453007 | | | 刘梦琳 | 河南师范大学环境学院,黄淮水环境污染防治省部共建教育部重点实验室,河南省环境污染控制重点实验室,新乡 453007 | | | 孙剑辉 | 河南师范大学环境学院,黄淮水环境污染防治省部共建教育部重点实验室,河南省环境污染控制重点实验室,新乡 453007 | sunjhhj@163.com |
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| 中文摘要 |
| 为了解新乡市地表水中HCHs和DDTs的分布特征及生态风险,采集新乡市18个地表水样并测定其中HCHs和DDTs的含量,采用概率密度函数重叠面积法和安全阈值法评价了HCHs和DDTs的生态风险. 结果表明,新乡市地表水中HCHs和DDTs的质量浓度范围分别为1.28~49.2 ng·L-1和0.42~12.3 ng·L-1,与世界各地的地表水中HCHs和DDTs残留质量浓度相比属于中等污染水平. 异构体比值表明HCHs污染的主要来源是林丹的使用,而DDTs的残留来源于工业品DDTs的使用. 生态风险评价基于DDD、γ-HCHs和p,p'-DDT的暴露浓度以及相应的毒性数据,概率密度函数重叠面积法和安全阈值法均表明了这3种有机氯农药中DDD的风险最大,其次是γ-HCHs,p,p'-DDT的生态风险最小; 安全阈值法进一步表明DDD、γ-HCHs和p,p'-DDT超过影响10%水生生物的概率分别为10.2%、5.94%和0.01%. |
| 英文摘要 |
| In order to investigate the distribution characteristics and ecological risk of HCHs and DDTs in the surface water of Xinxiang, 18 surface water samples were collected from from Xinxiang and the concentrations of HCHs and DDTs were determined. The ecological risk of HCHs and DDTs was evaluated using the overlapping areas of probability density function and safety threshold methods. The results showed that the levels of total HCHs (ΣHCHs) and total DDTs (ΣDDTs) in 18 samples detected by GC-ECD ranged from 1.28 ng·L-1 to 49.2 ng·L-1 and from 0.42 ng·L-1 to 12.3 ng·L-1, respectively. In comparison with those reported for other rivers around the world, the levels of HCHs and DDTs in surface water from Xinxiang ranked middle. The main cause for HCHs and DDTs residues in the studied area was usage of lindane and technical DDTs as revealed by the isomer ratios. The ecological risk evaluation was based on the exposure concentration and available chronic toxicity data of p,p'-DDT, γ-HCHs and DDD, and the overlapping areas of probability density function and safety threshold methods both showed that the ecological risk of these three OCPs to aquatic organism was in the order of DDD>γ-HCHs> p,p'-DDT. And the probability of exposure concentration exceeding the 10% value of the toxicity data for DDD, γ-HCHs and p,p'-DDT was 10.2%, 5.94%, 0.01%, respectively. |
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