铜、锌和三唑磷对泽蛙蝌蚪的毒性研究

以泽蛙蝌蚪为实验材料，采用联合指数相加法，研究了Cu，Zn和三唑磷对泽蛙蝌蚪的急性毒性及联合毒性效应。结果表明：Cu，Zn和三唑磷对泽蛙蝌蚪的急性毒性顺序为Cu〉三唑磷〉Zn。Cu对泽蛙蝌蚪24，48和96h的半致死浓度分别为0．98，0．70和0．43mg／L；Zn对泽蛙蝌蚪24，48和96h的半致死浓度分别为60．0，51．0和46．5mg／L；三唑磷对泽蛙蝌蚪24，48和96h的半致死浓度分别为5．63，5．47和5．30mg/L。联合毒性实验结果表明：Cu与Zn的联合毒性为协同作用；Cu与三唑磷的联合毒性为拮抗作用；Zn与三唑磷，Cu与Zn及三唑磷同时共存时的联合毒性，24h时为拮抗作用，48和96h时为协同作用。

Acute and Joint Toxicities of Copper, Zinc and Triazophos to Rana limnocharis Boie Tadpole

The additive index of coeffects was used to study the toxicities of Cu-Zn, Cu-triazophos, Zn-triazophos and Cu-Zn-triazophos on Rana limnocharis Boie tadpole. The acute toxicities of Cu, Zn and triazophos were in the sequence of Cu > triazophos > Zn. The 24, 48 and 96 h median lethal concentrations of Cu were 0.98, 0.70 and 0.43 mg/L respectively; the 24, 48 and 96 h median lethal concentrations of Zn were 60.0, 51.0 and 46.5 mg/L; the 24, 48 and 96 h median lethal concentrations of triazophos were 5.63, 5.47 and 5.30 mg/L. The additive toxicity of Cu-Zn was shown to be synergism, while that of Cu-triazophos was antagonistic; that of Zn-triazophos and Cu-Zn-triazophos was antagonistic when the tadpole was exposed to mixtures for 24 h; but that was synergism for 48 and 96 h.