摘要
硒是地壳中的重要非金属元素,自然环境中普遍存在着硒。微量硒是人体所需要的,但过多的硒对人体健康是有害的。环境中存在着硒的污染,大量的硒来自排水系统,造成了水环境的污染。据报道地面水中的硒可达1μg/L,而海水中可高达9000μg/L。
The effects of selenium (Se^(+4) and Se^(+6)) on activity, growth,reproduction and survival in Daphnia magna have been examined.Acute toxicity tests on Daphnia magna showed that the 24 h EC_(50) (immobilization) of Se^(+4) and Se^(+6) were 21.3mg/L and 12.3 mg/L(10.0～13.4) respectively. The 48h EC_(50) of Se^(+4) and Se^(+6) were 3.2 mg/L and 5.4(5.0～5.6) mg/L respectively.The LC_(50) of Se^(+4) 24h and 48h were 24.8 (24.0～25.5)mg/L. and 4.5 (4.1—4.9) m g/L in Daphnia magna respectively. The LC_(50) of Se^(+6) 24h and 48h were 18.7 (16.0～22.0) mg/L and 6.9 (6.4～7.6) mg/L in Daphnia magna respectively.The effect of additions of selenium (Se^(+6)) was 0.001 mg/L for growth and reproduction in Daphnia magna.The no-effect concentration of selenium (Se^(+6)) was 0.0001 mg/L for growth and reproduction in Daphina magna.
出处
《解放军预防医学杂志》
CAS
北大核心
1989年第3期225-229,共5页
Journal of Preventive Medicine of Chinese People's Liberation Army
