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Hyallela Azteca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.
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.
出处
《环境科学学报》
CAS
CSCD
北大核心
2012年第10期2600-2606,共7页
Acta Scientiae Circumstantiae
基金
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)~~
关键词
拟除虫菊酯
太湖
辽河
沉积物
毒性单元
pyrethroids
Taihu Lake
Liaohe River
sediments
toxic units
