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研究报告

Levels and toxicity assessment of pyrethroids in the surface sediments of Taihu Lake and Liaohe River

基金项目：国家水体污染控制与治理科技重大专项(No.2012ZX07529-003);国家自然科学基金(No.21077060);环保公益项目(No.201009026)

摘要：对辽河和太湖流域表层沉积物中8种常见的拟除虫菊酯:联苯菊酯、高效氯氟氰菊酯、氯菊酯、甲氰菊酯、氟氯氰菊酯、氯氰菊酯、氰戊菊酯、溴氰菊酯进行分析测定.结果显示,太湖流域中拟除虫菊酯含量范围为0.02~2.91ng·g^-1(干重,下同),平均含量为0.63ng·g^-1,处于相对较低的水平;辽河流域中的含量相对较高,其范围是0.14~19.6ng·g^-1,平均含量为6.20ng·g^-1.采用毒性单元TU(选用钩虾HyallelaAzteca的LC₅₀)对拟除虫菊酯毒性风险进行估算,太湖流域∑TU值范围是0~0.40,相比之下,辽河流域的∑TU值高出很多,范围在0.10~1.73之间,其中有3个点位的∑TU值大于1,表明其具有一定的生态风险,其毒性主要来源于氯氰菊酯和氰戊菊酯.

Abstract：Eight widely used pyrethroids,including bifenthrin,lambda-cyhalothrin,permethtin,fenpropathrin,cyfluthrin,esfenvalerate,cypermethrin and deltamethrin,were analyzed in the sediments collected from Taihu Lake and Liaohe River.The total concentration of the 8 pyrethroids in Taihu Lake was relatively low,ranging from 0.02~2.91 ng·g^-1 (dry weight,the same in the follows) with a mean value of 0.63 ng·g^-1.In comparison,the concentration in Liaohe River was relatively high and it varied in the range of 0.14~19.6 ng·g^-1 with an average of 6.20 ng·g^-1.Toxic units based on the LC₅₀ of Hyallela Azteca were calculated to estimate the toxicity risk.The ∑TU was in the range of 0~0.40 for the sediments in Taihu Lake,while it was much higher in Liaohe River with a range of 0.10~1.73.The ∑TU was larger than 1 for three sediments in Liaohe River,suggesting pyrethroids in these sediments could present potential toxicity to benthonic organisms.The toxicity was mainly induced by deltamethrin and cypermethrin.