アルカリ融解/誘導結合プラズマ発光分析法による地質標準試料中ホウ素の定量及び吸光光度法との比較

概要

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For the determination of boron in geological materials, spectrophotometry with the extraction of methylene blue fluoroborate by dichloroethane is more sensitive than ICP-AES. However, the interference of diverse elements in spectrophotometry is considerably more serious than that in ICP-AES, and the analytical procedures are much more complicated. Although the sample digestion-method with an acid mixture of H_2SO_4-HF can be safely adopted to common igneous rocks, some sediments and sedimentary rocks are not completely decomposed. A 0.1 g sample was fused with 0.5 g of sodium carbonate, and the melt was dissolved in 6 M HCl; then, boron was directly determined at the 249.678 nm emission line by ICP-AES. A determination limit of 4 μg/g of boron was achieved with a precision of less than 7%. The present method has been successfully applied to the analysis of 28 international geological reference materials.
社団法人日本分析化学会の論文
1998-07-05