重铬酸钾对方形网纹瑵的毒性研究  

TOSICITY OF K_2Cr_2O_7 TO GERIODAPHNIA QUADRANGULA(O.F.MULLER)

作　　者：庄德辉[1] 周晏敏 

机构地区：[1]中国科学院水生生物研究所,齐齐哈尔市环境监测中心站

出　　处：《环境科学学报》1994年第3期335-340,共6页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金

摘　　要：研究了在２５℃条件下重铬酸钾对方形网纹涤Ｃｅｒｉｏｄａｐｈｎｉａｑｕａｄｒａｎｇｕｌａ（Ｏ，Ｆ．Ｍｕｌｅｒ）存活、生殖和生长的影响。急性试验求得铬铬酸钾对该僵的２４ｈ和４８ｈＢｃ５０值分别为１．０１７９ｍｇ／Ｌ和０．４１２７ｍｇ／Ｌ；其可信限分别为０．４６９８一１．７１８０ｍｇ／Ｌ和０．１９８０一０．６９８８ｍｇ／Ｌ。慢性试验以存活、生殖和生长为毒性指标，未觉察反应浓度（ＮＯＥＣ）为０．０６２５ｍｇ／Ｌ，最低觉察反应浓度（ＬＯＥＯ）为０．１２５０ｍｇ／Ｌ，其应用系数在０．１５一０．３０之间。流水试验（ＮＯＥＣ）为０．０３１２５ｍｇ／Ｌ，（ＬＯＥＣ）为０．０６２５ｍｇ／Ｌ，其应用系数在０．０８一０．１５之间。结果还表明生长是最敏感的指标。Effects of K_2Cr_O2_7 on survival,growth,reproduction of Ceriodaphuia qua-drangula(O,F。 Muller) were studied under renewed static conditions.In acutetest the EC50 of K_2Cr_2O_7 to C. quadrangula was estimated to be 1.0179(0.4698一1.7180)mg/L for 24h and 0.4127(0.1980一0.6988)mg/L for 48hunder 25 + ±1℃. In chronic test(7 days)considering three criteria as a whole,the no-observed-effects concentrations(NOECs)were justified as 0。0625mg/Land the lowest-observed-effects concentrations(LOECs)were 0.125mg/L,Theapplication factors were deterlnined within the range of 0.15一0.30. Results oftest showed that toxicity of K_2Cr_2O_7 to C. quadrangula was more toxic in con-stant-flow test than in renewed static test and growth in both tests was re-garded as a more sensitive index for the toxicological assessments.

关 键 词：重铬酸钾 毒性 方形网纹. 

分 类 号：R994.6[医药卫生—毒理学]