镉在褐指藻～海湾扇贝食物链中的传递以及遗传毒性的检测

为了探究化学诱变剂镉在海洋食物链中的传递规律及其与人类健康的关系,作者设计了从海洋浮游藻类——褐指藻(Phaeodactylum tricornutum Bohlin)～海湾扇贝(Argopecten irradians Lamarck)的实验室食物链,采用极谱分析方法研究了镉的传递,并对贝肉(软体组织)灰样进行了紫露草微核(Trad-MCN)测定,结果:(1)经过6d的传递实验,处理组与对照组贝肉中镉的浓度均未超过对应组褐指藻中镉的浓度;经过这条食物链的传递,镉的浓度减少。(2)通过t测验发现,两个高浓度处理组与对照组贝肉灰样之间的诱变性差异显著(P<0.001与P<0.005)。t值的大小与镉的浓度具有一致性关系,说明镉的浓度越大,诱变性越强。

TRANSFER OF CADMIUM FROM PHAEODACTYLUM TRICORNUTUM BOHLIN TO ARGOPECTEN IRRADIANS LAMARCK AND ITS GENOTOXICITY

The transfer of the chemical mutagencadmium in marine food chains from the phytopl-ankton Phaeodactylum tricornutum Bohlin to the economic animal-scallop Argopecten irra-dians Lamarck and the relationship with human health were studied using polarography analyses. Mutagenicity of ashed part of cadmium contaminated scallop was tested by a Trad-MCN test. The results are as follows:1) Cadmium concentrations in soft part of both experimental scallops and controls did not exceed over those in the phytoplankton; cadmium concentration decreased in the transfer.2) By using t test, mutagenicity of ashed soft part of scallops of two experimental groups containing high cadmium concentrations was more significant than that of controls (P < 0.001 and P< 0.005 respectively). The more the cadmium concentration, the higher the mutagenicity.