化学诱变剂在实验海洋食物链中的流动以及遗传毒性的检测——I.无机诱变剂镉 (I)镉在褐指藻中的吸着与积累

FLUX OF CHEMICAL MUTAGENS THROUGH AN EXPERIMENTAL MARINE FOOD CHAIN AND THEIR GENOTOXICITY I. Inorganic Mutagen-Cadmium(Ⅰ)Sorption and Accumulation of cadmium by Phaeodactylum tricornutum Bohlin

海洋浮游硅藻——褐指藻Phaeodactylum tricornutum Bohlin对海水培养基中无机诱变剂镉的吸着与积累,是镉在实验海洋食物链中流动的起始。实验发现,高浓度的镉离子(>0.003mol/1)具有促使褐指藻绒聚并迅速沉淀的急性致毒作用;低于该剂量的镉离子能被褐指藻吸着与积累,并且不具有延缓生长的作用。褐指藻中积累的镉的浓度随剂量增大而增大。培养基中镉离子的减少量与剂量成线性关系。作者就褐指藻对镉离子的生物解毒作用进行了讨论。

Sorption and accumulation of cadmium by marine planktonic diatom Phaeodactylum tricornutum Bohlin were investigated in this study. It was noticed that high doses of cadmium ions (>0.003mol/L) induced flocculation and quick precipitation of P.tricornutum,and lower doses of cadmium ions could be adsorbed on and absorbed by P. tricornutum without delaying its growth. Cadmium concentrations in algae increased with dosage, and cadmium ions removed from the medium were in proportion to dosage. Mechanism of bio-detoxification of cadmium ions by P. tricornutum was discussed.