摘要:
对陕西省金水河水体中溶解性重金属进行监测与分析,结果表明:(1)水体中重金属的平均含量依次为FeVCuZnMoMnNiCoCd,全部符合国家饮用水标准;Cu超出地表水Ⅰ类标准限值;除Mn外,其余重金属的含量均超过汉江上游及长江河源区河水的背景值.(2)溶解性重金属的含量存在明显的空间分布特征,Cu,Zn,Mn,Fe,Zn,Ni和Mo在流域内人类活动区(如金水镇和庙坝村)的含量最高.(3)利用因子分析提取了4个公因子,揭示影响水体重金属含量的污染源主要来自未经处理的生活污水和农田地表径流;同时,根据因子得分系数,判断各个因子对水质污染的贡献率.
关键词:
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金水河
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重金属
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空间分布
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因子分析
Abstract:
Dissolved heavy metals were analyzed over the time period of 2006-2007 in order to determine their spa-tial pattern and pollution sources in the Jinshui river of Shaanxi.The results showed that(1)average contents of dissolved heavy metals in the Jinshui River was in the order of FeVCuZnMoMnNiCoCd,below the critical values of the Standards for Drinking Water Quality(GB5749-2006);Cu concentrations exceeded GradeⅠof the Environmental Quality Standard for Surface Water(GB88-2002);all dissolved heavy metals exceeded the background values in the upper Han River and the source area of the Yangtse River except Mn.(2)Dissolved heavy metals displayed spatial variability.Cu,Zn,Mn and Fe,Zn,Ni and Mo had the highest concentrations in sites adjacent to human settlements(i.e.,Jinshui town,Miaoba village).(3)General linear models of four factors derived from factor analysis were performed to evaluate the influence of untreated domestic sewage discharge and agricultural runoff on water quality in the river.