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Study on the determination of rare earth elements in coal ash by ICP-MS

Abstract In this paper, an analytical method for the determination of rare earth elements in coal ash by mixed acid decomposition-inductively coupled plasma mass spectrometry was established. Using this method, the content of 15 rare earth elements in coal ash can be detected accurately, with the detection limit being 0.007–0.033 μg·g−1, and the precision (RSD, n = 6) less than 5.0%. This method was used to test the coal ash of different commercial coals. The results show that the light rare earth elements in coal ash account for 75.66%–82.61% of the total rare earth elements, among which, the total amount of rare earth elements in Yitai coal after being ashed is significantly lower than that of other coals.