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机构地区:[1]贵州大学资源与环境工程学院,贵州贵阳550025
出 处:《贵州大学学报(自然科学版)》2014年第4期124-127,136,共5页Journal of Guizhou University:Natural Sciences
基 金:国家自然科学基金项目(41265008);贵州省环境保护厅环境科技项目(黔环科[2011]6号)
摘 要:通过2012年对贵州盘县大气降尘样品逐月收集,并利用微波消解、ICP-MS对降尘中重金属元素(Al、Mn、Fe、Cu、Zn、As、Pb、Ni、Cr、Cd、Hg)的含量进行测定,运用富集因子、相关性和主成分分析其来源与贡献。结果表明:盘县降尘重金属以Fe、Al为主,春季Fe含量最高为33784 mg/kg,其他依次为Zn>Cu>Mn>Pb>Ni>Cr>As>Cd>Hg。与贵州省土壤背景值相比,降尘中Zn、Cr、Pb的含量较低,Cd、Hg、Cu的含量较高。富集因子法表明:降尘中Hg富集程度较高,Cu、Mn、Ni、As、Cd、Zn、Pb有一定程度的富集,Fe、Cr属于自然源。通过相关性和主成分分析,认为Ni、Cu、As与燃煤相关,Pb、Hg与金属冶炼相关,Cr与地面扬尘相关,其贡献率分别为50.41%、28.86%、20.72%。与其他城市相比较,盘县降尘中Mn、Cr、Pb、Zn的含量偏低,As、Hg、Cd的含量偏高。Dustfall samples were collected in Panxian County of Guizhou Province in 2012;the content of heavy metals(Al,Mn,Fe,Cu,Zn,As,Pb,Ni,Cr,Cd,Hg) in dustfall was determined by microwave digestion and ICP-MS,using enrichment factor,correlation and principal component analysis to analyse its sources and contributions.The results show that Fe and Al were the mainly elements of dustfall in Panxian County,of which the highest content of Fe in spring was 33784 mg /kg,the content of other elements were Zn Cu Mn Pb Ni Cr As Cd Hg in Panxian County,compared with the background value of soil in Guizhou,the content of Zn,Cr,Pb were low and the content of Cd,Hg,Cu were high.Enrichment factor analysis indicates that Hg was mostly contaminated,Cu,Mn,Ni,As,Cd,Zn and Pb had a certain degree of enrichment,Fe and Cr were natural source.Through correlation and principal component analysis,Ni,Cu and As were related with coal,Pb and Hg were associated with metal smelting,Cr was related with ground dust,which the contribution rates were50.41 %,28.86 %,20.72 %.Compared with other cities,the content of Mn,Cr,Pb and Zn were low,the content of As,Hg and Cd were high of dustfall in Panxian County.
关 键 词:大气降尘 重金属污染 富集因子 主成分分析 来源分析
分 类 号:X513[环境科学与工程—环境工程]
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