两种重金属离子对黄口荔枝螺的毒性及其影响因素的研究

研究重金属Gu2 和Cd2 对黄口荔枝螺(Thais luteostoma)的毒性作用,并研究海水温度和螺的规格对毒性作用的影响。在预试验基础上,采用急性攻毒和联合攻毒方法。试验结果:Cu2 在72 h和96 h时的半致死浓度分别为0.94 mg/L和0.17 mg/L,而Cd2 在72 h和96 h时的半致死浓度分别为2.00 mg/L和1.10 mg/L。等浓度联合毒性试验表明:在72 h和96 h时的半致死浓度分别为0.86 mg/L和0.16 mg/L,在72 h和96 h的S值分别为1.33和1.07,AI值分别为-0.03和-0.07。影响因素研究表明,随温度升高毒性增强;螺的规格对Cu2 的毒性作用影响不大。结论:Cu2 的毒性比Cd2 强,联合毒性表现为拮抗作用;温度对重金属的毒性有明显影响,而螺的规格对毒性影响较小。

Toxic effect of two heavy metals on Thais luteostoma and its influential factors

The toxic effect of Cu2 and Cd2 on Thais luteostoma and its influential factors were studied under laboratory conditions.Results showed that the toxicity of Cu2 was stronger than the Cd2 ,the median lethal concentrations of 72 h and the 96 h were 0.94 mg L-1 and 0.17 mg L-1 for Cu2 ,2.00 mg L-1 and 1.11 mg L-1 for Cd2 .The combined toxin effect of Cu2 and Cd2 were studied under laboratory conditions.The result was that the median lethal concentrations of 72 h and the 96 h were 0.86 mg L-1 and 0.16 mg L-1,respectively.The combined effect of Gu2 and Cd 2 on Thais luteostoma was antagonistic.We also found temperature has significant influence on the toxicity of Cu2 ,the higher of the temperature,the stronger of the toxicity.However,size seemed to have little influence on the toxicity of the Cu2 .