渭河杨陵-兴平段水及沿岸造纸厂废水的致突变性

Mutagenicity of Water From Yangling-Xingping Section of Weihe River and Wasetwater From Paper Mills Along the River

目的探讨渭河杨陵-兴平段水及沿岸造纸厂废水的致突变性。方法污染源位于渭河杨陵-兴平段沿线的1号和2号造纸厂(造纸厂1、造纸厂2)。污染断面位于该段杨陵和兴平入渭河排污口(杨污、兴污),该断面的上游1km处为清洁断面(杨上、兴上),下游1km处为自净断面(杨下、兴下)。采集上述水样后分别进行Ames试验、小鼠精子畸形试验和蚕豆根尖细胞微核试验。结果Ames实验显示兴污、兴下及两个造纸厂废水致突变阳性。兴污、兴下及两个造纸厂废水所致精子畸形率显著高于阴性对照组(P<0.05)。除杨上水样外其余水样所致蚕豆根尖细胞微核率均高于阴性对照(P<0.05)。结论渭河杨陵-兴平段水质具有不同程度的致突变性。

Objective To study the mutagenicity of water from Yangling-Xingping section of Weihe River and wastewater from paper mills along the river. Methods No1 and No2 paper mill as the pollution source were located along the Yangling-Xingping section of Weihe River,their sampling points were named paper mill 1 and paper mill 2.The outlets for sewage at the bank of Weihe River in Yangling and Xingping were selected the sampling points of pollution sections, namely Yangwu and Xingwu respectively. The clear sections (Yangshang and Xingshang) were situated at a distance of 1 km from polluted sections at the upper reaches of Weihe River were selected and at the sames at the lower reaches were selected as the self-purification sections, namely Yangxia and Xingxia. The mutagenicity of water samples collected from above sampling points was tested by Ames test,mouse sperm malformation test, Vicia faba root tips cell micronucleus test. Results The results of Ames test showed that the water samples of Xingwu, Xingxia and two paper mills presented mutigenicity.The water samples of Xingwu, Xingxia and two paper mills showed significantly higher levels of sperm malformation rates compared with that of negative control group(P<0.05).All of the water samples, except Yangshang, showed significantly higher levels of micronucleus rate of Vicia faba root tips cells compared with that of negative control group(P<0.05). Conclusion The water from Yangling-Xingping section of Weihe River presented mutagenicity in different degrees.