ガラスビード試料を用いた炭酸塩岩中の主成分および微量元素の蛍光Ｘ線分析

抄録

Easy and quick analytical techniques of X-ray fluorescence spectrometry for carbonate rocks were investigated. The analyzed elements are SiO₂, TiO₂, Al₂O₃, total Fe₂O₃, MnO, MgO, CaO, Na₂O, K₂O, P₂O₅, Sc, V, Cr, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Ba, La, Ce, Nd and Pb. These elements were determined on a single glass bead made of a mixture of 1.2 g of sample powder without prior calcination, 6 g of Li₂B₄O₇ flux and about 35 mg of LiI releasing agent. Synthetic standard samples for calibration of a spectrometer were prepared from pure chemical reagents and were fused to glass beads likewise. Although loss on ignition during the fusion resulted in deviation of the flux/sample ratio of these glass beads, reliable calibration lines were obtained by theoretical corrections for matrix effects, flux/sample ratio and spectral line-overlap based on a fundamental parameter approach. Analytical results of GSJ geochemical reference samples were in good agreement with the recommended values and showed sufficient precision and sensitivity.