誘導結合プラズマ発光分光分析法によるバイオエタノール中硫黄定量における硫化ジメチル態硫黄の特異的な発光強度の増大

概要

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Inductively coupled plasma-optical emission spectrometry (ICP-OES) was applied for the determination of sulfur in biomass ethanol and compared with three conventional combustionbased methods of microcoulometry, ultraviolet fluorescence and oxyhydrogen flame combustion. The three combustion-based methods gave similar results. However, ICP-OES with standard solutions prepared from sulfate form-sulfur caused a serious overestimate due to the presence of dimethyl sulfide (DMS). The emission intensity of DMS form-sulfur was much higher than that of sulfate form-sulfur due to its high introducing efficiency to a plasma. Consequently, DMS form-sulfur caused a 6 to 21-times overestimate, depending on the ICP instruments used. In order to suppress this phenomenon, it was recommended to carry out PTFE closed-vessel acid decomposition with a mixture of hydrogen peroxide and acetic acid prior to an ICP-OES measurement.
社団法人日本分析化学会の論文
2007-07-05