基于灰色关联分析法的林甸县污水泡中重金属和毒性元素污染情况评价

为了探讨人类活动对水体重金属和毒性元素含量的影响,测量了污水泡8个样点的Mn、Fe、Cu、Zn、Cd、Pb等重金属和As、Se等毒性元素质量浓度。在综合考虑各种水质评价方法的基础上,采用灰色关联分析方法对水中重金属和毒性元素污染情况进行了评价。结果显示,水中重金属和毒性元素污染并不严重,8个采样点中有7个样点符合Ⅰ类水体标准,1个样点为Ⅱ类水体。其原因是污水泡附近没有工业区,排出的污水属生活污水,污染并非重金属和毒性元素造成。

Assessment of heavy metal and toxic element pollution in Wushuipao Lake in Lindian City based on grey correlation analysis

Applying the gray correlation analysis method to the analysis of the ground water quality,the present paper proves that the above method is simple,reasonable,reliable and instructive with the influence of subjective factors eliminated.In order to look into the effects of human activities on the severity of heavy metal and toxic pollution of the water,we have collected eight samples of eight heavy metals from Wushuipao Lake in Zhalong wetland,including Mn,Fe,Cu,Zn,Cd,Pb,As,Se,and then carefully measured them by using the standard pollution testing method known as ICP-MAS.After measuring and comparing a variety of evaluation methods based on the Environmental Quality Standards for Surface Water(GB 3838—2002),we have also taken reference to the state river-water quality classification standard and regulations,the heavy metals and toxic pollution was evaluated by the method of grey correlation analysis.After the data standardization and calculating the differencing sequences,we have worked out the maximal difference,the minimal difference,the correlation coefficient,the correlation degrees of all the observed sample sequences and standards in correspondence with the water quality gradation practice.Further calculations have been done as to the maximal correlation degrees of the eight samples,finding that they are respectively equal to 0.608 4,0.577 3,0.641 9,0.628 5,0.561 1,0.583 5, 0.578 8 and 0.530 0.The results indicate that the correlation degree of seven samples comes to class one and the only one of the eight samples comes to standard class two.All the results of our investigation prove that the heavy metal and toxic element pollution in the Wushuipao Lake isn’t serious as people imagine. Thus,our gray correlation analysis demonstrates that the water in the lake wasn’t heavily polluted and harmed by the toxic heavy metals because there were no industries nearby around the Lake,instead,the main source of untreated sewage discharged directly into the lake comes from the domestic household living.Therefore,the pollution hasn’t been caused by any pollution of heavy metals and toxic elements in the Lake.