林丹环境安全性评价研究

Environmental Safety Assessment of Lindane

为了评价林丹在环境介质中的持久性，对林丹的土壤降解、水解、光解与快速生物降解性进行了试验研究。结果表明，林丹的土壤降解半衰期为36．9～68．6d，水解半衰期为8．94～2310d，对光反应稳定，难以快速生物降解。林丹对斑马鱼的96h—LC50为4．22μg·L^-1，对环境生物具有极高的毒性；林丹在金鱼体内的生物富集系数BCF〉1000，具有较高的生物富集性。根据试验结果推断，林丹在环境介质中具有极强的稳定性，很容易在食物链中发生生物积累。

Soil biodegradation, hydrolysis, photolysis and rapid biodegradation were employed to assess the persistent of lindane in environmental media.The results showed that half-lives of lindane in soil and water were 36.9-68.6 d and 8.94-2 310 d respectively. Lindane was stable for photolysis and had no rapidly biodegradable. The acute toxicity 96 h-LC50 value of lindane to Brachydanio reri was 4.22 μg· L^-1 and BCF value of lindane to Carassius auratus was 〉1 000, indicating that lindane had high toxicity and hioconcentration to environmental organisms. Conclusion could be made that lindane had high persistent in environmental media and was apt to bioconcentration in food chain.