• 关键词：六六六  残留  生态风险  健康风险  巢湖

• 基金项目：国家水专项(No.2008ZX07103-005-01);国家杰出青年基金项目(No.40725004);国家自然科学基金重点项目(No.41030529);国家环境保护公益性行业科研专项(No.20100932);国家教育部博士点专项基金项目(No.20100001110035)

• 何伟
• 北京大学城市与环境学院, 地表过程分析与模拟教育部重点实验室, 北京 100871

• 秦宁
• 北京大学城市与环境学院, 地表过程分析与模拟教育部重点实验室, 北京 100871

• 何玘霜
• 北京大学城市与环境学院, 地表过程分析与模拟教育部重点实验室, 北京 100871

• 王雁
• 北京大学城市与环境学院, 地表过程分析与模拟教育部重点实验室, 北京 100871

• 孔祥臻
• 北京大学城市与环境学院, 地表过程分析与模拟教育部重点实验室, 北京 100871

• 欧阳慧灵
• 北京大学城市与环境学院, 地表过程分析与模拟教育部重点实验室, 北京 100871

• 徐福留
• 北京大学城市与环境学院, 地表过程分析与模拟教育部重点实验室, 北京 100871

• 摘要：利用SPE-GC-ECD方法测定了湖泊表层水体六六六类(HCHs)农药的含量,分析了其残留特征,探讨林丹的生态与健康风险.结果表明:①丰水期巢湖表层水体中HCHs含量范围为1.58～31.66ng·L^-1,平均为(2.57±2.07)ng·L^-1;α-HCH、β-HCH、γ-HCH和δ-HCH的平均含量分别为(0.42±2.28)、(1.10±2.24)、(0.77±2.08)和(0.24±0.07)ng·L^-1;β-HCH所占比例最大(41%～55%),其次为γ-HCH(16%～29%).②根据SSD模型,各样点γ-HCH生态风险均很小,全部物种的生态风险为1.6×10^-12～7.8×10^-9;γ-HCH对所有物种、脊椎动物、无脊椎动物、鱼类、甲壳类和昆虫与蜘蛛的安全阈值分别为53.70、125.89、25.70、107.15、22.39和27.54;γ-HCH对所有物种、脊椎动物、无脊椎动物、鱼类、甲壳类和昆虫与蜘蛛类的风险概率分别为1.8×10^-8、2.7×10^-12、6.0×10^-6、1.0×10^-11、1.2×10^-5和2.3×10^-7.③巢湖水作为饮用或者洗浴时,HCHs致癌风险均在百万分之一以下,风险很小;非致癌风险值均远远小于1,不会对人体产生明显非致癌健康危害.

• Abstract：The contents of hexachlorocyclohexanes(HCHs) in surface water from fifteen sampling sites in Lake Chaohu were measured by solid phase extraction-gas chromatography-electron capture detection(SPE-GC-ECD).The HCHresidues as well as potential ecological and health risks were analyzed.The results showed that:① the HCHcontent in surface water in Lake Chaohu during the high-water-level period varied from 1.58 to 31.66 ng·L^-1 with an average of(2.57±2.07) ng·L^-1.The average contents for α-HCH,β-HCH,γ-HCHand δ-HCHwere(0.42±2.28),(1.10±2.24),(0.77±2.08),and(0.24±0.07) ng·L^-1,respectively.β-HCHwas the predominant isomer with the highest percentage of 41%～55%,followed by γ-HCHwith the percentage of 16%～29%.② From the species sensitivity distribution model(SSD),the ecological risks of γ-HCHin all water sample sites were very low with ranges of 1.6×10^-12～7.8×10^-9.Margin of safety(MOS₁₀) of γ-HCHfor all species was 53.70.The MOSfor vertebrates,invertebrates,fish,crustaceans,and insects & spiders were,125.89,25.70,107.15,22.39,and 27.54,respectively.The risk probability of γ-HCHto all the species,vertebrates,invertebrates,fish,crustaceans and insects & spiders were 1.8×10^-8,2.7×10^-12,6.0×10^-6,1.0×10^-11,1.2×10^-5,and 2.3×10^-7,respectively.③ The carcinogenic risk of HCHs was lower than 10-6,and its non-carcinogenic risk was far less than 1,indicating that it would not cause significant carcinogenic and non-carcinogenic human health risks when using the lake water for drinking and bathing.

• Key words：HCHs  residues  ecological risk  health risk  Lake Chaohu

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