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铜与乙草胺对浮萍的联合毒性效应

Keywords: ,乙草胺,联合毒性,浮萍

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Abstract:

采用以体数、鲜重和叶绿素为测试指标的浮萍生长抑制试验(ISO20079),评价了Cu和乙草胺单一和复合污染的毒性效应。结果表明,Cu和乙草胺单一污染对浮萍上述指标均具有显著的抑制作用,且Cu的毒性大于乙草胺。Cu和乙草胺对浮萍的联合毒性作用与浓度组合及暴露时间密切相关:当采用浓度1∶1进行试验时,暴露时间为24h的相加指数(AI)为0.057,联合毒性为相加作用;暴露时间为48、96、168h的AI分别为0.193、0.509、0.783,为协同作用。而当采用毒性1∶1进行试验时,暴露时间为24h的AI为-0.163,为拮抗作用;48h的AI为0.029,为相加作用;96、168h的AI分别为0.471、0.585,为协同作用。总的来说,随着暴露时间的延长,联合毒性表现为协同作用。

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