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银川平原及周边地区表层土壤中多环芳烃分布特征

DOI: 10.11654/jaes.2014.11.010, PP. 2136-2142

Keywords: 多环芳烃,银川平原,表层土壤,分布特征

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Abstract:

为揭示银川平原及周边地区表层土壤中多环芳烃分布特征,分析了银川平原及周边地区37个表层土壤样品中16种美国环保署优先控制多环芳烃的含量与组成特征。结果表明,研究区域内表层土壤中多环芳烃含量为17.2~1199.3ng·g-1(干重)之间,算数均值为190.6±232.2ng·g-1,几何均值为125.9ng·g-1,与国内外相关研究相比处于较低水平。多环芳烃以三环和二环为主要组分,荧蒽与菲为主要污染物,主要来源为区域内的燃烧源排放。多环芳烃在研究区域内呈南北高、东西低的分布态势,人类生产、生活排放和土壤中有机质对多环芳烃的吸附性是影响其空间分布的重要因素。耕地中多环芳烃含量高于草地与荒地,接近我国东部地区耕地,且受土壤总有机碳影响,高环组分所占丰度高于草地和荒地。

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