重金属离子Cu Zn Cd的相互作用对Pb在鲫鱼组织中积累的影响

采用室内暴露试验方法研究了重金属离子相互作用对其在鲫鱼组织中积累的影响。结果表明,混合重金属离子相互作用对Pb在鲫鱼组织中的积累的影响与离子的种类、数量及组织的类型有关。Pb的积累主要与Zn、Cd以及它们的共同作用关系密切;随着重金属离子种类数目的增加,相互作用对积累的影响变得显著;重金属离子混合后使Pb在鱼鳃中的积累浓度降低,肝脏中的积累浓度升高;对Pb在肌肉中的积累无影响。在鳃中的积累主要受表面位点竞争作用主导,而在肝脏中的积累主要与MT的诱导作用有关。重金属离子相互作用不会改变Pb在鲫鱼组织中的分布规律,Pb在鲫鱼组织中的积累顺序为肝脏>鱼鳃>肌肉。

Effects of the Interaction of Copper, Zinc and Cadmium on the Accumulation of Lead in the Tissues of the Carassius auratus

The results demonstrated that accumulation of copper was related to metallic species and concentration, and as well as fish tissues. The accumulation of lead was affected greatly by the action of the Cadmium and Zinc; the effects became more significant with the increase of the metal concentration; the accumulation of the lead decreased in gill in the mixture-metal interaction, but increased in the liver; The metal mixture could not affect the accumulation of lead in the muscle. The accumulation of lead in the tissues followed the order: liver>gill >muscle. The hypothesis was firstly proposed that combined the surface competition theory and MT induction theory, which could be used to explain perfectly the metal accumulation under the interaction of mixture-metal. The metal accumulation under the interaction of the mixture-metal was dominantly controlled by the surface competition in the gill and by the MT induction theory in the liver.