ICP-AES Analysis of a Rare-Earth Ore by Means of Spectral Fitting.

概要

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A spectral fitting method is described to analyze the ICP-AE spectrum of a crude rare-earth chloride obtained from a monazite ore. Each window for a rare-earth element (width, 1nm; 400 data) was successively analyzed using some developed software. The linear additivity of observed reference spectra of rare-earth elements in a spectrum database was assumed to synthesize a simulated spectrum, and differences between the simulated spectrum and an observed spectrum were minimized by a least-squares method which varies linear coefficients. Consequently, determined rare- earth elements (mass% of total rare-earth) were Y(0.42%), La(23.7%), Ce(45.5%), Pr(5.38%), Nd(19.8%), Sm(3.60%), Eu(0.011%0), Gd(1.17%), Tb(0.077%), Dy (0.26%), Ho(0.032%), Er(0.029%) and Yb(0.005%). Tm and Lu could not be determined due to weak line intensities. It took less than 2 min to analyze each window, when a personal computer equipped with an 80486 CPU was used. The obtained analytical results agreed well with those obtained by isotachophoresis- particle induced X-ray emission, confirming the utility of this method for such samples with heavy spectrum interference.
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