三种有机磷萃取剂对水生生物的毒性效应

The toxicity offects of three organophosphorus extractants to aquatic organisms

通过３种有机磷萃取剂：甲基磷酸二仲辛酯（Ｐ３５０）、异辛基磷酸单异辛酯（Ｐ５０７）和磷酸二异辛酸（Ｐ２０４）对不同营养级水平的单种生物：藻类（斜生棚藻）、草履虫（尾草履虫）、类（大型）、鱼类（鱼苗）的毒性试验，结果表明：３种有机磷萃取剂的毒性效应浓度（半致死浓度或半抑制浓度）为Ｐ３５０：０．４０～９．３０ｍｇ／Ｌ，Ｐ５０７：２３．３２～１１２．００ｍｇ／Ｌ，Ｐ２０４：５９．５０～１３８．００ｍｇ／Ｌ；毒性强弱的顺序为Ｐ３５０＞Ｐ５０７＞Ｐ２０４；建议把Ｐ３５０、Ｐ５０７、Ｐ２０４在水体中的安全浓度暂分别定为０．０４ｍｇ／Ｌ、２．３３ｍｇ／Ｌ和４．７１ｍｇ／Ｌ。

After a series of single-species toxicity tests on algae(Scened esmus obliquus), Paramecia(Paramecium caud aium), daphnids(Daphnia magna) and fish(fry) in different trophic levels, the result shows that toxicity effect concentrations (LC50or EC50) for three organophosphous extractants are 0.40～9. 30mg/L- for P350, 23. 32～112. 00mg/L for P507 and 59. 50～138.00mg/L for P204. The toxicity is in the order of P350>P507>P204. The safety concentrations in freshwater ecosystem were prescribed temporarlly to be 0. 04mg/L for P305, 2. 33mg/L for P507 and 4. 71mg/L for P204 respectively.