Arsenic in Chinese coals: Distribution, modes of occurrence, and environmental effects

Yu KANG, Guijian LIU, Chen-Lin CHOU, Ming Hung WONG, Liugen ZHENG, Rui DING

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Abstract

Arsenic, one of the most hazardous elements occurring in coals, can be released to the environment during coal processing and combustion. Based on the available literature and published results obtained in our laboratory, the content, distribution and the modes of occurrence of As in Chinese coals, and its environmental and impacts are reviewed in this article. With the 4763 sets of data (from the literature) rearranged, the arithmetic mean As concentration of each province and weighted mean As concentration of the entire country (using the expected coal reserves as the weighting factor) were calculated. The weighted mean As concentration in Chinese coals is 3.18 mg/kg, with As concentration increasing from northern China to southern China. The As concentration in coal varies with coal-forming ages and coal ranks. Arsenic has several modes of occurrence in coals. According to results obtained by other studies and our own experiments, As is mainly associated with mineral matter (such as pyrite and other sulfide minerals) in coals, although a significant amount of arsenic is associated with organic matter. The accumulation of As in coal is controlled by many geological factors during coal-forming processes, including plant decomposition, sedimentary environments, and epigenetic hydrothermal activity. During the combustion of coal, As is released to the air, water, and soil, causing serious environmental pollution. More than 45% of the coal consumed in China is utilized by power plants, and it is estimated that nearly 522 tonnes, 21 tonnes and 252 tonnes of As are emitted into the atmosphere by industries, residential buildings and coal-fired power plants, respectively, every year. Copyright © 2011 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)1-13
JournalScience of the Total Environment
Volume412-413
DOIs
Publication statusPublished - Dec 2011

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Coal
Arsenic
environmental effect
Environmental impact
arsenic
coal
distribution
coal processing
Power plants
coal rank
coal-fired power plant
hydrothermal activity
Sulfide minerals
Pyrites
pyrite
power plant
combustion
Biological materials
sulfide
Minerals

Citation

Kang, Y., Liu, G., Chou, C.-L., Wong, M. H., Zheng, L., & Ding, R. (2011). Arsenic in Chinese coals: Distribution, modes of occurrence, and environmental effects. Science of The Total Environment, 412-413, 1-13. doi: 10.1016/j.scitotenv.2011.10.026

Keywords

  • Arsenic
  • Chinese coal
  • Modes of occurrence
  • Geologic factors
  • Environmental impact