レーザーラマンスペクトル法による粒状洗剤中の無機成分の分析

19781011

抄録

The analysis of inorganic builders in detergent powders was studied by means of laser Raman spectrometry after the extraction with 95% ethanol. The Raman spectra of aqueous solutions of typical inorganic builders, that is, sodium tripolyphosphate (Na₅P₃O₁₀), sodium pyrophosphate (Na₄P₂O₇), sodium carbonate, and sodium sulfate, were measured. The characteristic peaks of each compound were located at 1090 cm^-1, 1065 cm^-1, 1020 cm', and 978 cm^-1, respectively. We found that each component was able to be readily detected from Raman spectra of mixtures of four compounds. The Raman spectra were applied to the analysis of some commercial detergent powders and it was clarified that builders of each of the samples can be readily identified by the characteristic peaks mentioned above. The determination of Na₅P₃O₁₀, Na₄P₂O₇, Na₂CO₃, and Na₂SO₄ in the detergent powders were made by using sodium formate as an internal standard. It was shown that the analytical curve for each component exhibits a good linearity, and quantity of each of the builders in commercial detergent powders can be determined with good precision.