基于发光细菌法的农产品中主要重金属的联合毒性评价

Assessment on joint toxicity of heavy metals in agricultural products based on luminescent bacteria method

通过细菌发光抑制试验,研究Pb^(2+)、Cd^(2+)和Hg^(2+)的单一毒性,以及Pb^(2+)+Cd^(2+)、Cd^(2+)+Hg^(2+)、Pb^(2+)+Hg^(2+)、Pb^(2+)+Cd^(2+)+Hg^(2+)的混合毒性,分别采用等毒性单位法与加和指数法,对其混合物的联合毒性进行评价。结果表明,3种重金属的毒性大小为Hg^(2+)>Pb^(2+)>Cd^(2+)。对于混合体系,两种评价方法结果一致,即Pb^(2+)+Cd^(2+)为协同作用;Cd^(2+)+Hg^(2+)、Pb^(2+)+Hg^(2+)和Pb^(2+)+Cd^(2+)+Hg^(2+)均为拮抗作用。

Toxic of Pb2＋, Cd2＋ , Hg2＋, Pb2＋＋Cd2＋ , Cd2 ＋ Hg2＋, Pb2＋ ＋Hg2＋ and Pb2＋ ＋Cd2＋ ＋HgZ4were investigated u sing luminescent bacteria test. The joint toxicities of heavy metals mixtures were assessed by toxic unit method and additive index meth od. Results showed that the joint toxicity of Pb2＋ with Cd2＋ was synergetic in action while the joint toxicities of Cd2＋ with Hg2＋ , Pb2＋ with Hg2＋ , and Pb2＋ with Cd2＋ , Hg2＋ were antagonistic.