中国煤中汞的环境地球化学研究

被引：115

作者：

郑刘根

刘桂建

齐翠翠

陈怡伟

张莹

机构：

[1] 中国科学院壳幔物质与环境重点实验室中国科学技术大学地球和空间科学学院

来源：

中国科学技术大学学报 | 2007年 / 08期

关键词：

环境地球化学; 汞; 中国煤; 赋存状态;

D O I：

暂无

中图分类号：

P595 [元素地球化学];

学科分类号：

070902 [地球化学];

摘要：

在测试分析中国7个省62个煤样品中汞的含量基础上,结合已有1 637个中国煤样品中汞的数据,全面探讨了中国煤中汞的环境地球化学特征.并采用逐级化学提取实验和相关分析方法,分析和研究了中国煤中汞的化学赋存状态.分析结果表明:中国煤中汞的含量一般为0.1～0.3mg/kg,平均0.19 mg/kg,接近于美国的平均值(0.17 mg/kg),高于世界的平均值(0.10 mg/kg);汞在不同地区、不同成煤时代以及不同煤类中分布极不均匀;其赋存状态也多种多样,高硫煤中汞与硫化物关系密切,主要赋存在黄铁矿中;低硫煤中,硫化物结合态和有机结合态汞常共同占支配地位;影响汞分布和赋存状态的主要原因是地质因素.实验结果表明,在岩浆侵入的煤层中,汞大多以硅酸盐结合态存在.煤中汞的赋存状态与煤中汞的释放、毒性有着重要的关系.同时燃煤释放的汞已对中国部分地区的环境造成了污染,控制燃煤过程中汞的排放是今后研究的重要内容之一.

引用

页码：953 / 963

页数：11

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