カーボンブラック添加によるアルミニウムのふっ化物，りん酸塩の直接フレームレス原子吸光分析

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  • Direct determination of aluminum fluoride and aluminum phosphate by flameless atomic absorption spectrometry in the presence of carbon black.

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We have previously reported on the effects of carbon black for the direct determination of metal oxides such as beryllium oxide, etc., which have high atomization temperatures on atomic absorption spectrometry.<BR>This paper deals wit h the effects of carbon black for the direct and absolute determination of the solid samples of aluminum fluoride and aluminum phosphate ground to tiny powder (about 1.6 pm particle size), by means of flameless AAS. And then, aluminum in cryolite was determined by this method as practical analysis.<BR>It has been observed that the aluminum absorbance was increased about 2.4 times by addition of about 1 wfv% carbon black to aluminum fluoride containing 1 ppm aluminum and about 1.7 times increasing was obtained in the case of aluminum phosphate. From X-ray diffraction and thermodynamic considerations, it appears that the carbon black led to a rapid decomposition of the salt and formation of oxide on the ashing step.<BR>The detection limit was about 1×10-9g⋅ml-1, and the coefficient of variation of a luminum fluoride (containing aluminum of 1 ppm) was 5.1% (5 times determination).

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