偏光ゼーマンバックグラウンド補正を備えた黒鉛炉原子吸光光度計による瀬田川水中のアルミニウム分析のための硝酸マグネシウムマトリックス修正液

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Magnesium nitrate solution without containing nitric acid was used as the matrix modifier in graphite furnace atomic absorption spectrometry with polarized Zeeman background correction for the determination of dissolved aluminum in Seta River water. The effect of various factors including the concentration of magnesium nitrate solution, wavelength, the kind of graphite cuvette, and the method of baseline correction was examined on the determination of aluminum in a standard solution and/or Seta River water after filtration. The magnesium nitrate concentration was most appropriate at 1000ppm for the determination from the standpoint of chemical interference. A suitable wavelength to use was 309.3nm. A wavelength of 396.2nm may be useful in the determination of samples containing aluminum over 0.5μM, because the sensitivity was decreased to about one-half of that at 309.3nm. Instead of the usual pyrocoated graphite cuvette, a tube-type cuvette was tested, but the sensitivity decreased too much. The trueness and reproducibility of ten determinations for standard aluminum solutions were measured. Irrespective of the method of the baseline correction, the determined values were mainly influenced by the wavelength used. A higher concentration was usually obtained at 309.3nm than at 396.2nm. The relative standard deviation of ten determinations for a summer sample was within 10% for both wavelenghths. In a winter sample, the relative standard deviation was relatively higher, due to the gradual decrease in aluminum concentration during preservation in a thermostated water bath at 30℃.

偏光ゼーマンバックグラウンド補正を備えた黒鉛炉原子吸光光度計による瀬田川水中のアルミニウム分析のための硝酸マグネシウムマトリックス修正液

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