利用微核技术评价水质重金属污染的指标探讨

利用蚕豆根尖细胞的微核技术和正交试验法,对含Pb、Cd、Cr和As的不同浓度组合的模拟废水进行监测,结果表明,各处理的徽核率与对照的微核率的差异均达到极显著或显著水平,当污染指数<1.68时,水质基本没有受重金属污染物污染;当污染指数≥1.68-<2.98时,“废水”中重金属污染物含量未超标;当污染指数≥2.98-<4.90时,污染物含量亦未超标,但已有1种以上污染物含量达到农用灌溉水质二类标准;当污染指数≥4.90-<5.38时,有1种或2种污染物含量超标;当污染指数>5.38时,至少有3种污染物含量超标.

Use of Micronucleus Test Technique to Evaluate the Water Pollution Index of Heavy Metal

Micronucleus test technique in vicia faba root tips and ortnogonal design-based experiments have been used to monitor the pollution by model wastewater containing different levels of Pb, Cd, Cr and As. The results show that the difference of micronucleus frequency (MCNF) among each treatments are significant or very significant as compared with the control. When the pollution index is < 1.68, the water is not considered to be polluted by heavy metal pollutants; when the pollution index is > 1.68-2.98,the content of heavy metal pollutants in thewastewater is not over the standard capacity; when the pollution index is > 2.98-4.9, the pollutants are not over the standard capacity but there is at least a kind of pollutants that complies with the second standard capacity of irrigation water; when the pollution index is > 4.90-5.38, there are one or two heavy metal pollutants over standard capacity; when the pollution index is >5.38, there are at least 3 kinds of heavy metal pollutants over standard capacity.