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北京降尘重金属污染水平及其空间变异特征

熊秋林 赵文吉 束同同 陈凡涛 郑晓霞 潘月鹏

熊秋林, 赵文吉, 束同同, 陈凡涛, 郑晓霞, 潘月鹏. 北京降尘重金属污染水平及其空间变异特征[J]. 环境科学研究, 2016, 29(12): 1743-1750.
引用本文: 熊秋林, 赵文吉, 束同同, 陈凡涛, 郑晓霞, 潘月鹏. 北京降尘重金属污染水平及其空间变异特征[J]. 环境科学研究, 2016, 29(12): 1743-1750.
XIONG Qiulin, ZHAO Wenji, SHU Tongtong, CHEN Fantao, ZHENG Xiaoxia, PAN Yuepeng. Heavy Metal Pollution Levels and Spatial Variation Characteristics of Dust Deposition in Beijing[J]. Research of Environmental Sciences, 2016, 29(12): 1743-1750.
Citation: XIONG Qiulin, ZHAO Wenji, SHU Tongtong, CHEN Fantao, ZHENG Xiaoxia, PAN Yuepeng. Heavy Metal Pollution Levels and Spatial Variation Characteristics of Dust Deposition in Beijing[J]. Research of Environmental Sciences, 2016, 29(12): 1743-1750.

北京降尘重金属污染水平及其空间变异特征

基金项目: 教育部博士学科点专项科研基金项目(20111102110004);国家自然科学基金青年科学基金项目(41101404);北京市教委科技计划项目(KM201110028013)

Heavy Metal Pollution Levels and Spatial Variation Characteristics of Dust Deposition in Beijing

  • 摘要: 为了研究北京大气降尘中重金属污染水平及其空间变异特征,分别于2013年6—10月(非采暖期)、2013年11月—2014年3月(采暖期)收集了北京大气降尘样品66份,采用Elan DRC Ⅱ型电感耦合等离子体质谱仪(ICP-MS)测试了样品中的37种重金属质量分数.结果表明:非采暖期北京大气降尘中Cd、Zn、Pb 3种重金属污染最严重,三者质量分数分别为5.3、822.0、177.2 mg/kg,分别超出各自北京背景值的1 065.0%、516.2%和403.1%;采暖期北京大气降尘中Mo、Cd、Bi、Zn 4种重金属污染最严重,四者质量分数分别为8.7、2.7、3.0、660.5 mg/kg,分别超出各自北京背景值的656.9%、495.8%、457.5%和395.2%;与非采暖期相比,采暖期大气降尘重金属中除Zn、Pb、Cd质量分数分别降低了19.6%、25.3%和48.9%外,其余元素的质量分数却有不同程度的升高,其中Sr、Ba、Ce、Cu、Cr、W、La、Ni、Mo、Co等10种重金属质量分数升高了53.2%~176.7%.ArcGIS地统计插值研究表明,非采暖期主要重金属(Cr、Cu、Zn、Zr、Ba和Pb)空间分布呈现出较强的变异性;采暖期降尘中主要重金属存在不同程度的空间变异,Ba和Zn的空间变异较强,二者高值区和低值区相互交错分布;Cu和Pb的空间变异相对较弱,二者高值区和低值区分布均呈规律性分布.元素示踪分析表明,无论是采暖期还是非采暖期,北京降尘重金属污染均主要来源于机动车尾气和垃圾焚烧.

     

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  • 收稿日期:  2016-04-12
  • 修回日期:  2016-07-28
  • 刊出日期:  2016-12-25

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