Trace elements in Chinese coal

Author: Tang Xiujiao
Publisher:
Publish Date: 2004-12-01
Features: This book compiles data on the contents of 63 trace elements in coal (including 14 rare earth elements) in China based on the author's analytical data and analytical data extracted from publicly published works. It distinguishes between "content values detected in most coal samples" and "content values detected in a few coal samples." The former accounts for more than 75% of the total sample count and can be considered the general background value of an element in coal. The content values detected in a few samples can be regarded as "abnormally enriched values." The distribution of trace elements in coal is uneven, and there can be significant differences between different mining areas and different parts of the same coal seam. Distinguishing between general values and abnormal values is necessary. In Chapters 4, 5, 6, and others of this book, not only are the content values of trace elements in coal in China listed, but also those in major coal-producing countries in North America, South America, Oceania, Africa, Europe, and Asia. Additionally, the average values of trace elements in the world's coal estimated by the U.S. Geological Survey (1980), Soviet scholar Yudovich (1985), Australian scholar Swaine (1990), and Czech scholar Bouska (1999) are also listed. Through these data, readers will gain a comprehensive understanding of the abundance of trace elements in coal. This is the foundation for studying trace elements in coal. Based on the author's own analytical data and analytical data from publicly published works, this book compiles data on the contents of 61 trace elements in coal in China and distinguishes between "content values detected in most coal samples" and "content values detected in a few coal samples." It also lists the content values of trace elements in coal from other major coal-producing countries and the average values of trace elements in the world estimated by scholars and research institutions from other countries. Through these data, readers will gain a comprehensive understanding of the abundance of trace elements in coal. This book is a systematic and comprehensive monograph on trace elements in coal, which basically reflects the main research achievements in this field in China at the end of the 20th century and is primarily intended for reference by educators, researchers, and environmental protection workers.