信阳市浉河水体重金属污染监测与评价

Monitoring and Evaluation of Heavy Metal Pollution of Shihe River in Xinyang City

为了分析浉河水中重金属污染状况,在春、夏、秋和冬四个季节对水中重金属Cr、Mn、Fe、Cu、Zn、As、Cd、Hg和Pb浓度进行监测。基于《生活饮用水卫生标准》(GB 5749—2006)和《地表水环境质量标准》(GB 3838—2002)III类水体中重金属浓度限值,采用内梅罗指数法对水质污染状况进行评估。结果表明:仅点位10的Mn浓度超过生活饮用水标准的限值(100μg/L),在四个季节的平均值为122.25μg/L,超标率为22.25%。水中重金属浓度随季节变化顺序为冬季>春季>秋季>夏季。以生活饮用水标准为评估标准时,仅点位10在冬季属于轻污染状态,其余点位在四季均处于较清洁或清洁水平。以地表III类水体作为标准时,浉河各点位均处于清洁水平。

In order to analyze the pollution of heavy metals of the Shihe River,the concentrations of heavy metals(Cr,Mn,Fe,Cu,Zn,As,Cd,Hg and Pb)in the water were determined in the four seasons of spring,summer,autumn and winter.Based on the concentration limits of heavy metals in sanitary standard for drinking water(GB 5749—2006)and category III in surface water(GB 3838—2002),the water pollution status was evaluated by the Nemero index method.The results showed that only the concentration of Mn at point 10 exceeded the limit of drinking water standard(100μg/L),the average value of Mn content in this point was 122.25μg/L,and the over standard rate was 22.25%.The concentration of heavy metals decreased in the order of winter,spring,autumn and summer.When the sanitary standard for drinking water was applied as the evaluation standard,only point 10 was lightly polluted,and the remaining points were relatively clean or clean in four seasons.When the category III of surface water was used as the standard,all points were clean in four seasons.