铜·镉·铬·铅对河南华溪蟹的急性毒性作用

[目的]为水产品的健康养殖提供科学依据。[方法]以对环境因子敏感的指示生物河南华溪蟹为材料,研究了Cu、Cd、Cr、Pb对河南华溪蟹的急性毒性作用。[结果]在同一时间,河南华溪蟹的死亡数随重金属浓度的升高呈"S"型增长。处理组中河南华溪蟹溪蟹的死亡数和死亡率均随重金属浓度的升高和处理时间的延长而增加。4种重金属对河南华溪蟹的半致死剂量(LC50)随处理时间的延长而减小。4种重金属在24h对河南华溪蟹的毒性依次为Cu>Cr>Cd>Pb,而48h毒性依次为Cd>Cu>Cr>Pb。与其他3种重金属相比,Cd的半致死浓度随时间的延长而较为显著地下降。[结论]河南华溪蟹对重金属具有较强的耐受力。

Study on the Acute Toxic Effects of Ca, Cd, Cr and Pb on Sinopotamon henanense

[Objective] The aim of the research was to provide the scientific basis for the healthy culture of aquatic products.[Method] The indictor animal Sinopotamon henanense with sensitivity to the environmental factors were taken as materials to study the acute toxic effects of Cu,Cd,Cr and Pb on S.henanense.[Result] At the same time,the dead number of S.henanense showed an increase with S shape along with the increasing of the concn.of heavy metals.In treated groups,the dead number and the death rate of S.henanense were both increased with the rising of the concn.of heavy metals and the prolonging of the treating time.The median lethal dose(LC50) of 4 kinds of heavy metals to S.henanense were decreased with the prolonging of the treating time.The toxicity of 4 kinds of heavy metals to S.henanense after 24 h in order was Cu>Cr>Cd>Pb,while the toxicity after 48 h was in order as Cd>Cu>Cr>Pb.Compared with other 3 kinds of heavy metals,the median lethal concn.of Cd was decreased more significantly with the prolonging of the time.[Conclusion] S.henanense had stronger tolerance to heavy metals.