摘要
为研究水生生物对水体中重金属和有机磷农药毒性的响应,研究了锯齿新米虾暴露在Cu^(2+)、毒死蜱单一溶液和毒性1:1混合溶液下的响应状况,同时采用相加指数法对混合毒性进行了评价。单一毒性试验结果表明:毒死蜱对锯齿新米虾的毒性显著高于Cu^(2+)(p<0.01);Cu^(2+)对锯齿新米虾未觉察反应浓度(NOEC)和最低觉察反应浓度(LOEC)分别为1.78 mg·L^(-1)、2.40mg·L^(-1),24、48、72和96 h的LC_(50)分别为6.41、4.75、4.20和3.44 mg·L^(-1);毒死蜱对锯齿新米虾NOEC和LOEC分别为0.04μg·L^(-1)、0.07μg·L^(-1),24、48、72和96 h的LC50分别为035、0.17、0.11和0.06μg·L^(-1);参考鱼类毒性分级标准,Cu^(2+)对锯齿新米虾为高毒,而毒死蜱为剧毒。混合毒性试验结果表明:采用Cu^(2+)和毒死蜱毒性1:1进行试验时,暴露时间为24、48、72和96 h的相加指数(AI)分别为0.02、0.45、1.86和223,即混合毒性为协同作用。通过研究锯齿新米虾对Cu^(2+)、毒死蜱单一和联合毒性的响应,可为水环境污染与防治、物种多样性保护提供科学依据。
We investigated the response of aquatic organisms to heavy metals and organ-phosphoruspesti- cide in waters. We exposed Neocaridina denticulate to Cu2＋, pure chlorpyrifos solution and a 1：1 compound toxicity solution. We evaluated the comprehensive toxicity using the additive index method. The single toxicity tests showed that chlorpyrifos had significantly higher toxicity to N. denticulate than Cu2＋ （p 〈0.01）. The Cu2＋ concentrations for which we observed no effect on N. denticulate （no observed effect concentration, NOEC） and for which we observed the lowest effect （lowest observed effect concentration, LOEC） were 1.78 mg·L（-1）, 2.40 mg·L（-1）, respectively. The LC50 of 24 h, 48 h, 72 h and 96 h were 6.41 mg·L（-1）, 4.75 mg·L（-1）, 420 mg·L（-1）and 3.44 mg·L（-1）, respectively. For chlorpyrifos, the NOEC and the LOEC were 0.04 μg·L（-1）, 0.07 μg·L（-1）, respective- ly, the LCso of 24 h, 48 h, 72 h and 96 h were 035, 0.17, 0.11 and 0.06 μg·L（-1）, respectively. According to fish toxicity grading standards, Cu2＋ was highly toxic to N. denticulate while chlorpyrifos was virulent. The com- prehensive toxicity tests showed that the joint toxicity of Cu2＋and chlorpyrifos was synergistic when the tox- icity was 1：1 at 24 h, 48 h, 72 h and 96 h, and the addition index （A/） were 0.02, 0.45, 1.86 and 223, respectively. This study orovided a scientific basis for preventing, water pollution and conserving aauatic diversity.
出处
《生态毒理学报》
CAS
CSCD
北大核心
2014年第4期785-792,共8页
Asian Journal of Ecotoxicology
基金
上海市水务局"十二五"河道生态治理技术指南研究及编制(沪水科2011-07)
关键词
锯齿新米虾
CU2+
毒死蜱
毒性响应
Neocaridina denticulate
Cu2＋
chlorpyrifos
toxicity response
