Simultaneous Determination of Inorganic Builders in Powder Detergents by Inductively Coupled Plasma Atomic Emission Spectrometry

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  • 誘導結合プラズマ発光分析法による粉末洗剤中の無機ビルダーの同時定量
  • ユウドウ ケツゴウ プラズマ ハッコウ ブンセキホウ ニ ヨル フンマツ セン

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A new method based on inductively coupled plasma atomic emission spectrometry (ICP-AES) was used for the simultaneous determination of five kinds of inorganic builders in powder detergents. For the determination of water soluble inorganic builders (silicate, phosphate, and borate), detergents were dissolved in water and specific elements (Si, P, and B) of the builders in a sample solution were indicated by ICP-AES. Zeolite and calcium carbonate were insoluble in water. Thus, for their determination, detergents were dissolved in diluted nitric acid and specific elements (Al and Ca) in the solution were found by ICP-AES.<BR>Anionic and nonionic surfactants had no effect on the emission intensity of specific elements. The coexistence of sodium ions i. e., counter ions of builders and anionic surfactants, presented no problem. Increase in the concentration of nitric acid, used for preparing a sample solution, in the analytical solution decreased the emission intensity of Si, P, Al, and Ca. This situation could be eliminated by the matrix-matching method. Values obtained for inorganic builders in several commercial detergents by the present method good agreements with those by conventional methods.

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