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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.