兰坪矿区水体重金属污染调查

Research on Heavy Metal Pollution of Water in Lanping Mining Area

目的调查兰坪矿区水体中铅、锌、镉、铜和锰5种重金属元素的含量,以了解矿产开发对水体的污染。方法在矿区采集有代表性的水样,密封后带回实验室,采用原子吸收分光光度法测定样本中5种元素的含量,以国家水体环境质量标准中元素的最大限值为比较标准,分析水体中重金属的超标状况。结果水样中铅、锌、镉、铜和锰5种元素的超标率分别为97.67%、3.33%、65.12%、0%和4.56%;平均污染指数分别为21.94、0.30、35.74、0.05和1.53。结论兰坪矿区环境水体中存在普遍和严重的铅和镉污染,部分矿区水样有锌和锰污染,水样中未检出铜污染样品。

[Objective] To investigate the contents of 5 kinds of heavy metals which included lead,zinc,cadmium,copper and manganese in water in Lanping mining area,in order to know the water pollution caused by mineral resources exploitation.[Methods]The representative water samples were selected in mining area,and were brought back to lab after being sealed. The contents of 5 kinds of heavy metals were tested by atomic absorption spectrophotometry. The maximum limit of elements in national environmental quality standards was regarded as the comparative standard,and the exceeded condition of heavy metals in water was analyzed. [Results]The over standard rate of lead,zinc,cadmium,copper and manganese in water was 97.67%,3.33%,65.12%,0 and 4.56%,respectively. The average pollution index was 21.94,0.30,35.74,0.05 and 1.53,respectively.[Conclusion]The pollution of lead and cadmium in wate was widespread and serious in Lanping mining area. There were pollution of zinc and manganese in water samples from some mining area. Copper pollution was was not found in water samples.