ICP/OES와 XRF를 이용한 석고의 주원소 분석 비교 및 미량 독성원소 분석
Evaluation of Gypsums in Terms of Major and Toxic Trace Elements by ICP/OES and XRF Analysis
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Abstract
Major and trace toxic elements in commercially available gypsums were analyzed. The contents of a known major compound, CaSO4 was measured in terms of Ca and S. Ca and S were initially analyzed by means of XRF, and Ca was re-analyzed by ICP/OES for data evaluation. Trace toxic elements of As, Cd and Pb were analyzed by ICP/OES, while Hg by mercury analyzer, respectively. Some gypsum samples turned out to be counterfeit. Si detection in the counterfeit suggests that it may be SiO2. The results obtained by XRF for each major elements analysis were similar to the theoretical values. On the contrary, the data obtained by ICP/OES showed much lower values than theoretical ones. The low solubility of the gypsum in nitric acid and in water in the pre-treatment process was thought to be the source of this error. The content of Fe w
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