China Univ Min & Technol, Beijing 100083, Peoples R China
; Chinese Acad Sci, Inst Geochem, Guiyang 550002, Peoples R China
; Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China
The concentration ranges of As and Sb in six Late Permian high-arsenic coals collected from Xingren and Xingyi, Guizhou Province are 94.1 mu g.g(-1)-3.2% and 8.1 mu g.g(-1)-120 mu g.g(-1), respectively. Based on the mineralogical analysis, no arsenic and arsenic-bearing minerals are detected in these samples and arsenic occurs in coal macerals. By extended X-ray absorption fine structure(EXAFS) spectroscopy, we have found that arsenic in these high-arsenic coal samples coordinates with oxygen; the coordination number of As with oxygen for these samples is 4 except one sample(H(9)) for which the coordination number of As is 3. Therefore, arsenic in these high-arsenic coals does not occur in sulfide minerals, but occurs in arsenate or arsenite phase, and the preponderance of As is in arsenate of As(5+).
Zhao, FH,Ren, DY,Zheng, BS,et al. Modes of occurrence of arsenic in high-arsenic coal by extended X-ray absorption fine structure spectroscopy[J]. CHINESE SCIENCE BULLETIN,1998,43(19):1660-1663.
Zhao, FH.,Ren, DY.,Zheng, BS.,Hu, TD.,Liu, T.,...&刘涛.(1998).Modes of occurrence of arsenic in high-arsenic coal by extended X-ray absorption fine structure spectroscopy.CHINESE SCIENCE BULLETIN,43(19),1660-1663.
Zhao, FH,et al."Modes of occurrence of arsenic in high-arsenic coal by extended X-ray absorption fine structure spectroscopy".CHINESE SCIENCE BULLETIN 43.19(1998):1660-1663.