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兰州城市表层土壤重金属污染的环境磁学记录 被引量:36

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摘要 对兰州市城区117个表土样品的磁学参数和重金属元素进行系统分析,探讨应用环境磁学技术评价城市土壤重金属污染的可行性及有效性.结果表明:兰州市表土主要载磁矿物为低矫顽力磁铁矿.土壤磁性矿物浓度高值和磁晶粒度参数低值分布在西固区北部的工业园区,城关区东部的零散工业区以及连接城关区与其他3区的狭长路段,并且与污染负荷指数(PLI)及内梅罗指数(PN)圈定的高值区域基本吻合.兰州地区重金属(As,Cr,Cu,Ni,Pb,Zn,Fe)综合污染的环境磁学半定量研究显示,当磁化率lf<35×108m3kg1时,土壤为清洁状态;当35×108lf<150×108m3kg1时,为轻度污染;当150×108lf<365×108m3kg1,为中度污染;当365×108lf<750×108m3kg1且fd%<2.7,ARM/SIRM<0.2×103mA1时,为中度-重度污染的过渡;lf≥750×108m3kg1且fd%<2.7,ARM/SIRM<0.2×103mA1时,为重度污染.表土中度-重度以上污染主要来自工业和交通,显示兰州市污染类型已逐渐向"交通+工业型"转变.
出处 《科学通报》 EI CAS CSCD 北大核心 2012年第32期3078-3089,共12页 Chinese Science Bulletin
基金 国家自然科学基金(41071125,40871090) 中国科学院“百人计划”(O827631002,29O827631)资助
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