アンモニウムライネッケ塩による非イオン界面活性剤の分光光度定量

抄録

Spectroscopic determination has been developed for nonionic surfactants, using ammonium reineckate as precipitant in the presence of sodium ion.
It was found that polyethylene glycol (PEG) of average molecular weight 1000 to 20000 react to form the stoichiometrical complex precipitate, polyethylene glycol reineckate (PEG-R) containing 13 moles of ethylene oxide for each mole of reinecke acid. And the combined spectroscopic and ion exchange or gravimetric procedures demonstrated that PEG of average molecular weight 2000 to 20000 react stoichiometrically to form the complexes, Na-PEG-R and Ba-PEG-R, in the presence of sodium ion and barium ion, and these reineckates contain 11 moles of ethylene oxid and 1 mole of sodium, and 10 moles of ethylene oxide and 0.5 moles of barium, respectively, for each mole of reinecke acid.
A plot of absorbance at 525mμ against the amount of each PEG reineckates in the aceton solutions was found to be linear, while PEG-R is soluble in water and the aceton solutions of Ba-PEG-R give scattering values in the absorbance.
Then, determination of PEG and other nonionic surfactants was studied in the presence of sodium chloride, and PEG and each nonionic surfactant could be determined by using each calibration curve.
However, all of surfactants used for the present experiment, were able to be determined with only one calibration curve, by plotting absorbance against the amount of ethylene oxide contained in their surfactanti.