LiBO_2による変成岩・火成岩の分解法の検討及びそれらの主要元素(珪素を除く)とZrの定量

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  • Evaluation of methods for digestion of metamorphic and igneous rocks using LiBO_2 and the determination of major elements (except Si) and Zirconium
  • LiBO2 ニ ヨル ヘンセイガン カセイガン ノ ブンカイホウ ノ ケントウ オヨビ ソレラ ノ シュヨウ ゲンソ ケイソ オ ノゾク ト Zr ノ テイリョウ

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Pelitic gneisses and schists containing minerals insoluble in hydrofluoric acid such as staurolite, andalusite and others, and igneous rock reference samples of the Geological Survey of Japan (GSJ) were decomposed by the method of Crock et al. with fuming process of hydrofluoric acid after fusion using LiBO_2 to remove Si which tends to form a gelatinous precipitate. However, they often left residues. To get a clear, stable solution of these rocks, the method of Crock et al, was modified : better results were obtained by repeated drying of the residues by adding a mixed solution of HCl, HClO_4 with a little more water in the process of the expulsion of residual fluorine. The contents of Al, Fe, Mg, Ca, Ti, Mn and Zr in the metamorphic rocks and the GSJ igneous rock reference samples were determined by means of an inductively coupled argon plasma/optical emission spectrophotometer, and the Na and K contents by atomic absorption spectrometry. The results of chemical analyses for the GSJ igneous rock reference samples decomposed by the modified method show the reasonable values for the major elements (except Si) and Zr. The results of analyses of the pelitic gneisses and schists, containning the minerals resistant to hydrofluoric acid (HF), decomposed by both the modified method and mixed acid show that this modified method is available in analyses of the major elements and Zr for the metamorphic and igneous rocks bearing the minerals resistant to HF.

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