2013年威海南部近岸海域表层海水重金属分布特征及污染评价

Distribution characteristics and pollution evaluation of heavy metals in surface water of Weihai south coastal area in 2013

于2013年春季、夏季及秋季对威海南部近岸海域表层海水重金属进行调查,分析了重金属含量分布特征并利用重金属综合污染指数(WQI)进行污染评价。采用多元线性回归方法分析了重金属含量与表层海水盐度、pH及化学需要量之间的相关性。结果表明,威海南部近岸海域表层海水水质良好,符合二类海水水质标准,受外源输入的影响较大;综合污染指数均远低于1,呈现从海岸线向外海逐渐降低的趋势;重金属元素含量与环境要素测值(pH、盐度及COD)之间相关性顺序为:As>Hg>Cu>Cd>Pb>Zn。

To find out the distribution characteristics of heavy metals in surface water of Weihai south coastal area ,the investigation was carried out in the spring ,summer and autumn of 2013 and used the index W QI （comprehensive pollution index ）to evaluate the pollution situation .And the multiple linear regression analysis method was used to analyze the relativity between concentrations of heavy metal and salinity ,pH and COD .The research found that the surface water of the investigated area were clean and according with the second quality standard of sea water ,largely influenced by external re‐source .WQI were far below 1 and decreased from the coast to open sea .Multiple linear regression method indicated that the descending order of the relativity between concentrations of heavy metal and salinity ,pH and COD were ：As〉 Hg〉Cu〉Cd〉Pb〉Zn .