^(60)Co在人工海洋小生境中的行为

Behaviour of Co-60 in artificial marine microhabitat.

在自行建立的人工海洋小生境中,采用示踪法和S-80智能多道分析器及Ge(Li)探头测量放射性,研究^(60)Co在小生境中的行为。结果表明,^(60)Co进入海水后以颗粒态的形式存在;沉积物对^(60)Co的浓集系数仅为3—4。在排泄实验中,沉积物出现重新吸附的现象。海洋动物的肝脏(消化腺)、胃肠是浓集^(60)Co的关键器官,其浓集系数高达2—3个数量级;除有机酸外,主要生化成分均能检出^(60)Co,其总量分布主要集中在脂肪,其次是蛋白质。排泄实验之后,胃肠及生化物质里的^(60)Co损失显著,肝脏(消化腺)仍残留50％,而毛蚶的蛋白质仍有83％的残留量。

The behaviour of Co-60 was comprehensively studied in a marine microhabitat in the presence of Cs-137, Cs-134, Zn-65, Fe-59 and Mn-54 by appling artifical modeling.The result showed that after getting into sea water,Co-60 was rapidly adsorpted by suspen sates and phytoplanktons. The concentrative ability of sediments for Co-60 was very low,its concentration coefficient was 3—4 in 96 hr. The distribution of Co-60 in marine organisms and biochemical materials was studied at the same time. The critical organs for concentrating Co-60 were liver(or digestive-g'and) and stomach-intestine. The Co-60 in the great majority of biochemical materials can be detected except organic acids.Co-60 is mainly distributed in lipid, then in protein. After excretion experiment, the loss of Co-60 in stomach-intestine and biochemical materials was marked.However,the remain of Co-60 in liver(or digestive-gland) and protein of Arca subcrenata was 50% and 83% respectively. The concentration coefficient of Co-60 in sediments was 1—70 times compa red with the original.