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Determination of sodium sulfate in anionic surfactants by nonaqueous titration
Author(s) -
Yamaguchi Shinichiro
Publication year - 1978
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02682457
Subject(s) - chemistry , sulfate , sulfuric acid , titration , sodium sulfate , inorganic chemistry , sulfonate , perchloric acid , sodium , titration curve , sulfation , sulfonic acid , chromatography , organic chemistry , biochemistry
A convenient and easy method was developed for nonaqueous titrimetric determination of sodium sulfate in the presence of sulfonate and sulfate type anionic surfactants. Sodium sulfate and the anionic surfactants were converted to sulfuric acid and the corresponding organo‐sulfonic or organo‐sulfuric acids by the addition of an excess of perchloric acid. The resulting acid mixture was then titrated in methanol with cyclohexylamine. The sulfate content was calculated from the difference of the two end points of the differentiating titration curve. For the determination of sodium sulfate in typical anionic surfactants, the relative standard deviation varied from 0.7 to 2.0% at the 0.3–10% sodium sulfate levels. The method provides a rapid and precise determination of inorganic sulfates in sulfonated or sulfated materials.