• 关键词：重铬酸钾  毒性  方形网纹

• 基金项目：国家自然科学基金

• 庄德辉
• 中国科学院水生生物研究所, 武汉 430072

• 周晏敏
• 齐齐哈尔市环境监测中心站

• 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0.4698-1.7180mg/L和0.1980-0.6988mg/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（NO

• Abstract：Effects of K₂Cr_O2₇ on survival,growth,reproduction of Ceriodaphuia qua-drangula（O,F。 Muller） were studied under renewed static conditions.In acutetest the EC50 of K₂Cr₂O₇ to C. quadrangula was estimated to be 1.0179（0.4698-1.7180）mg/L for 24h and 0.4127（0.1980-0.6988）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 0.15-0.30. Results oftest showed that toxicity of K₂Cr₂O₇ 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.

• Key words：K₂Cr₂O₇  toxicity  Ceriodapknia qundrangula

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