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选取2013—2015年黄浦江表层沉积物数据,利用地质积累指数法、内梅罗综合指数法、潜在生态危害指数法对Cu、Pb、Zn、Cd数据进行评价。结果表明,2013—2015年黄浦江沉积物Cu、Pb、Zn和Cd的数据低于黄浦江背景值,表明重金属污染有降低的趋势;就单个重金属元素而言,3种评价方法中,地质积累指数法和内梅罗综合指数法的评价结果均为无污染或轻微污染,而潜在生态危害指数法结果为Cu、Pb、Zn元素属于中度污染,3种评价方法得出4种元素的污染程度也不相同;内梅罗综合指数法和潜在生态危害指数法评价结果表明,黄浦江沉积物重金属综合污染指数或综合生态风险均处于较低风险。 相似文献
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The current testing for paralytic shellfish poisoning(PSP) in shellfish is based on the mouse bioassay(MBA).To alleviate animal welfare concerns,we evaluated the utility of using sublethal indicators of toxicity as an alternative to measuring time to death.Live mice were injected with a PSP congener and the changes in neurotransmitter levels were measured 60,90,and 120 min after injection.Acetylcholine(ACh) was the most sensitive marker for PSP toxicity.The changes in neurotransmitter levels were most pronounced in the blood.Thus,measurement of Ach levels in the blood may serve as a sensitive predictor for PSP that would not require sacrifice of the mice.This method was relatively simple,sensitive(less than 1 μg/kg weight,equivalent to 20 ng/mL),low maintenance,and rapid(less than 60 min). 相似文献
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