Speciation of inclusions in aluminium by X-ray diffraction and fluorescence methods combined with preconcentration by filtration and selective dissolution.

KITAMURA Teruo, TANIMOTO Shigemi, IWATSUKI Masaaki, NISHIDA Shintaro

doi:10.2116/bunsekikagaku.47.211

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Other Title

ろ別濃縮／選択溶解／Ｘ線回折・蛍光Ｘ線法によるアルミニウム中介在物の状態別定量
ロベツノウシュクセンタクヨウカイ Xセンカイセツケイコウ Xセンホ
〓別濃縮/選択溶解/X線回折・蛍光X線法によるアルミニウム中介在物の状態別定量

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Abstract

A method for the determination of trace amounts of corundum(α-Al₂O₃), α-quartz and other metallic elements as inclusions in aluminium with X-ray diffraction and fluorescence analyses has been developed. An aluminium sample was melted and filtrated through a porous alumina filter (100 μm in pore size). These inclusions were concentrated in a layer on the filter with almost 100% recovery, and collected on a membrane filter after dissolving matrix metallic aluminum with a bromine-methanol solution. The X-ray intensities of the inclusions on the membrane filter could be measured without any significant interference of the coexisting materials, except for light elements in relatively. large amounts of inclusions. The regression coefficients between the intensities and amounts of standard specimens were 0.9900.999 and the reproducibilities were satisfactory. Corundum in the range of 0.070.5 ppm and α-quartz in the range of 0.020.09 ppm and the other metallic elements, such as Mg, Al, Si, Ti, Mn, Fe and Cu at the ppb level were determined. Spinel and other inclusions could also be determined by this method.

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BUNSEKI KAGAKU

BUNSEKI KAGAKU 47 (4), 211-217, 1998

The Japan Society for Analytical Chemistry

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