Abstract
Because of discrepant geological circumstances and activities, the characteristics of trace elements in coals vary significantly, including the distribution of content and occurrence in different coal-forming periods, coal ranks, and coal-bearing regions. Evaluating trace elements in coals is useful for indicating the quality of coal, predicting potential environmental pollution during the combustion procedure of coal, and demonstrating the possibility of extracting valuable elements from coal. According to the data and studies discussed in this chapter, homogeneity is the predominant tendency of trace elements in coals around the world. However, some coal samples are enriched with or deficient in certain elements in a changing range. The reason and impact of this abnormal situation are systemically discussed and the key points of further research are proposed.
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