Cd~(2+)对青蛤(Cyclina sinensis)的毒性及蓄积过程研究

利用水生动物急性毒性实验方法,在6个浓度下Cd2+对青蛤的急性毒性进行测定,经回归分析后,得到Cd2+对青蛤96h半致死浓度为20.09mg/L,安全浓度为0.201mg/L。分别对半致死浓度和安全浓度下Cd2+在青蛤体内不同组织的蓄积情况进行了分析。结果表明,在半致死浓度条件下,168h青蛤各组织Cd2+的含量依次为肌肉内脏团鳃;而在安全浓度下,其结果为内脏团鳃肌肉,内脏团对于Cd2+富集能力远高于肌肉。讨论了青蛤的养殖环境及产品检验等问题。

ACUTE TOXITY TEST AND ANALYSIS ON ACCUMULATION OF CADMIUM (Cd2+) TO THE CLAM CYCLINA SINENSIS

To determine the acute toxicity Cd²⁺ to Cyclina sinensis, six concentrations of Cd²⁺ were tested. The 96-h half lethal concentration (LC₅₀) and the safe concentration of Cd²⁺ for C. sinensis were 20.09mg/L and 0.201mg/L, respectively. In addition, we determined Cd²⁺ accumulation in C. sinensis at both the LC₅₀ and the safe concentration. At the LC₅₀ and 168h after the addition of Cd²⁺, various tissue contents of Cd²⁺ followed the order of muscle > visceral mass > gill; while at the safe concentration, the order was visceral mass > gill > muscle. The Cd²⁺ accumulating capacity of the visceral mass is much higher than that of the muscles. Our data may serve as a reference to evaluate Cd²⁺ distribution in C. sinensis farms and C. sinensis-based seafood products.