超音波ネブライザーとロングトーチの使用による水平配置軸方向観測誘導結合プラズマ発光分析法の感度の改善

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  • Use of an ultrasonic nebulizer and a long torch for improving the sensitivity in an axially-viewed horizontal ICP-AES.
  • チョウオンパ ネブライザー ト ロングトーチ ノ シヨウ ニ ヨル スイヘイ ハイチジク ホウコウ カンソク ユウドウ ケツゴウ プラズマ ハッコウ ブンセキ ホウ ノ カンド ノ カイゼン

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The analytical performance of a long torch used in an ultrasonic nebulization system for axially viewed horizontal inductively coupled plasma atomic-emission spectrometry (ICP-AES) was examied using a high-resolution echell spectrometer with wavelength modulation and second-derivative detection. The optimum operating condition of the ICP-AES and the relative ratios of the delivery of the sample aerosol to the plasma torch of ultrasonic and cross-flow nebulization systems were studied for 21 elements having spectral lines between 210 and 770 nm. The relative ratios of the delivery of the sample aerosol were about 14% for the ultrasonic nebulizer and about 1% for a cross-flow nebulizer. In comparison with the conventional torch used in an ultrasonic nebulization system, net emission intensities of 21 elements increased by 2040%, and the background intensities of water and its fluctuation decreased for all elements. The values of S/σ (S, signal intensity of an analyte; σ, standard deviation of the background intensities) and BEC (background equivalent concentration) were improved for all elements. The limits of detection were improved by 1.2-fold (Ga) and 5.2-fold (K). On the other hand, in contrast to a long torch used for the cross-flow nebulization system, the net emission intensities increased by 8-fold and 15-fold in many elements, and the background intensities of water decreased due to the desolvation effect. The values of S/σ. for the greater part of the elements were improved by more than 10-fold and the BEC values were improved by 7-fold and 12-fold. The detection limits were improved by 3.3-fold (Zn) to 26-fold (Ag, Ba). In comparison with the conventional torch used for the ultrasonic nebulization system and the long torch used for the cross-flow nebulization system, the repeatability produced by the relative standard deviation of the net emission intensities was improved. The dynamic range for each element was about four or five orders of magnitude. The emission line (422.673 nm) of Ca showed interference by Na above 1 mg dm-3 when using the long and conventional torch for ultrasonic nebulization system, and showed interference by Na greater than 50 mg dm-3 using the long torch for cross flow nebulization systems; however, it was scarcely affected by phosphoric acid of below 3 v/v%. In order to demonstrate the usefulness of this work, the direct analysis of a standard reference material, NRCC SRM SLRM-2 (river water), was performed. Good accuracy and precision were obtained, except for a few elements.

収録刊行物

  • 分析化学

    分析化学 48 (3), 339-347, 1999

    公益社団法人 日本分析化学会

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