界面活性剤分析法の研究-19-

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For the analysis of aromatic surfactants by ultraviolet spectrophotometry, the absorption spectra of various surfactants, i.e., sodium dodecylbenzene sulfonate, alkyl pyridinium halides, alkyl benzyl dimethyl ammonium chlorides, POE alkyl phenols and formaldehyde condensates of naphthalene sulfonate, have been measured. These surfactants exhibited the characteristic absorption bands and λmax which were relatively in dependent of chain length of alkyl group, kind of halide and moles of ethylene oxide, and thus it was recognized that UV absorption spectra were useful in the identification and qualitative analysis of aromatic surfactants. The λmax (mμ) of surfactants were determined as follows : sodium alkylbenzene sulfonate : 261, alkyl pyridinium halide : 259.5, alkyl benzyl dimethyl ammonium chloride : 263, POE alkyl phenol 277, formaldehyde condensate of naphthalene sulf ovate : 289290, 332. At the λmax existence of a straight linear relationship between extinction and concentration (%) was confirmed.
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