【摘要】 采用隆线 (D .carinata)为试验生物 ,研究Cr6+ 对隆线趋光指数的影响 ,并与LC50 急性毒性结果进行了比较 .结果表明 ,水的趋光指数 (Ip)与铬浓度存在着显著的相关关系 (y =0 391- 0 5 14x ,R2 =0 81) ,3h的Ip 监测下限为 0 0 5 6mg·L-1,分别是LC50 ( 2 4h)及LC50 ( 48h)的 2 3 6 0 %和 39 0 0 % ,仅相当于LC50 ( 96h) .因此 ,利用水趋光指数 ,可能为评价水体的健康状况提供一种快速、灵敏的方法更多还原

【Abstract】 Daphnia carinata was used and the LC₅₀ of Cr（VI） regarding to phototactic behaviour was obtained. The results showed that there was a significant correlation between the phototatic index （I_p） and the concentrations of Cr（VI） （y=0.391-0.514x,R²=0.81）. The detect limit Cr（VI） based on Ip was 0.056?mg·L^-1 at 3?hour, which was 23.6% of LC₅₀ at 24?h and 39.00% at 48?h, respectively, but was similar to LC₅₀ at 96?h. The endpoint could be compared to LC₅₀ of acute toxicity, the changes in phototatic index（I_p） of Daphnia carinata could be use as a quick and sensitive endpoint for monitoring water qualities.更多还原