Verification of the presence
of various additives in gear oils is often of interest and different methods have been suggested for the purpose. To identify
dialkyldithiophosphate additives in lubricating oils, lewkowitsch isolated
the compounds in the form of
copper salts. Paper chromatography was applied to the identification of certain anti-oxidants by Delves. Among the
compounds distinguished were
diphenylamine, phenothiazine, and
phenyl alpha and phenyl beta
naphthylamines.
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