中国煤中砷的含量分布及分级研究

Study on the distribution and gradation of arsenic in Chinese coals

砷是煤中有害的微量元素之一,针对目前煤中砷对环境和人类健康的危害问题,本文依据全国已发表的煤样数据资料,对不同时代、不同煤变质程度和各省市煤样品中砷的含量重新进行了统计分析,结果表明统计数据频率直方图和频率密度曲线呈单峰且近于对称,显示了煤中砷的含量呈正态分布的特性。参照前人提出的煤中砷含量分级标准,提出了我国煤中砷含量新分级标准。最后,针对煤中砷的污染防治和砷含量限值给出了相关建议。

Arsenic is one of the detrimental trace elements in coal .It is harmful to environment and human health .On the basis of data of arsenic content in coals has published in China until now ,A statistic analysis of arsenic in coal of different ages ,in different degree of metamorphism and at different provinces has been done .The results show that the frequency histogram for data and frequency density curve of data is unimodal and nearly symmetric .It indicates that the distribution of arsenic in coal fitting the normal distribution .Combining with the previous standard of arsenic content in coal ,A new gradation for arsenic is put forward .Finally ,A series prevention against arsenic pollution by coal usage and the threshold of arsenic in coal use are proposed .