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地球学报  2006 

中国煤中砷的含量分布、赋存状态、富集及环境意义

DOI: 10.3975/cagsb.2006.04.11

Keywords: 煤中砷,赋存状态,微量元素,砷中毒,环境地球化学,中国煤

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Abstract:

砷是煤中有害微量元素之一,在煤加工利用过程中,砷会以各种形式释放出来,进入环境。本文在全面分析现有资料和文献的基础上,结合作者对中国煤中砷的研究成果,分析了中国煤中砷的含量与分布、赋存状态、富集因素以及环境意义。通过研究和分析可知,中国煤中砷的平均值约为5μg/g,但在不同地区、不同时代以及不同类型的煤中有较大的差异,除中国西南地区含量异常高外,一般含量均在10μg/g以内;煤中砷的赋存状态多种多样,主要以无机态的硫化物结合为主,并常与黄铁矿等矿物伴生,也存在有机态结合的砷;中国煤中砷的来源和富集主要是以陆源母岩、成煤植物、沉积环境和构造裂隙—热液作用等为主的多种因素综合控制的结果;在煤燃烧过程中,煤中的砷释放出来,并对长期生活在燃煤地区的环境和人体产生影响。本文还提出今后煤中砷研究的主要方向,以为煤中砷的研究提供参考资料。

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