A method for the quantitative determination of ethylene oxide adducts in their aqueous solutions or dispersions

Abstract

SummaryA method for quantitative determination of ethylene oxide adducts is described. By precipitation in hydrochloric acid solution with a known quantity of ferrocyanic acid, filtration, and titration with zinc sulfate, the consumption of ferrocyanic acid can be determined. From the results a m.d. of less than 8% was calculated, the corresponding figure for adducts containing more than 9 ethylene oxide units does not surpass 5%. The reaction takes place on the ethylene oxide chain in the compound. To precipitate an adduct containing 6 units ethylene oxide approximately one mole of ferrocyanic acid is necessary.

Recent advances in the analysis of soaps and synthetic detergents

“…Sehonfeldt (33) utilized potassium ferrocyanide to precipitate the nonionic. The precipitate is filtered off, and the residual ferrocyanide in the filtrate is then titrated with zinc sulfate, using potassium ferrieyanide-diphenylamine indicator.…”

Identification of polyoxyalkylene‐type nonionic surfactants by paper chromatography

“…Gravimetric, volumetric and colorimetric methods for the quantitative determination of nonionics are widely used for examining detergent products (10,11,14). These methods are limited to the determination of nonionics as a group, and no indication of the class or of the chemical formula is obtained for an unknown product.…”