[Acid extraction of coal for the determination of major ash forming elements by ICP-AES].
A new method is described for the analysis of whole coal for the major ash forming elements by ICP-AES. The major ash forming elements were extracted with HF and HNO3 in an ultrasonic water bathe. The best proportion of the acid and the time of extraction were studied. Compared with the ash content of coal, the extraction ratio is more than 95%. Recovery ratio is between 96%-104%. RSD of extraction and determination is less than 4% (n = 9).
Liu
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State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, 030001 Taiyuan.
Zhang
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Y