An automated method for determining free alkalinity or acidity in soap | Zendy

Hoover W. E. | Zendy; Ginn M. E. | Zendy; Jungermann Eric | Zendy

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An automated method for determining free alkalinity or acidity in soap

Author(s) -

Hoover W. E.,

Ginn M. E.,

Jungermann Eric

Publication year - 1968

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/bf02915344

Subject(s) - alkalinity , chemistry , autoanalyzer , sodium hydroxide , ph indicator , phenolphthalein , inorganic chemistry , chromatography , organic chemistry

An AutoAnalyzer method has been developed to determine free alkalinity or acidity in soap by use of a mixed cresol red‐phenolphthalein indicator solution and by measurement of the color developed at 550 m µ . An internal standard or reference solution is used consisting of a soap solution which has been adjusted to represent neutrality. The method was applied for 0 to 0.10% free alkalinity, calculated as sodium hydroxide, and for 0 to 0.50% free acidity calculated as oleic acid. Attainable precision of the method (95% confidence limits) in the ranges explored was found to be ±0.0025% for free alkali and ±0.05% for free acidity.

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