Abstract
Recently, various kinds of metal dialkyldithiocarbamates have been applied as lubricating oil additives.This paper deals with the separation and identification of metal dialkyldithiocarbamates having one to five carbon atoms in the alkyl group by partition paper chromatography.It was found that the solvent systems of liquid paraffin (stationary phase) -ethyl alcohol or isopropyl alcohol (mobile phase) and polyoxyethylene octylphenolether (E.O. 10mol), triphenyl phosphate·tricresyl phosphate (1 : 1), cresyldiphenyl phosphate or dimethyl phthalate (stationary phase) -n-heptane (mobile phase) are suitable for partition paper chromatography of these metal dialkyldithiocarbamates.Rf values of metal dialkyldithiocarbamates are principally affected by the number of carbon atoms in the alkyl group and not affected so much by the kind of metal in the solvent system of liquid paraffin-ethyl alcohol or isopropyl alcohol. On the other hand, the kind of metal affects remarkably the Rf values as well as the number of carbon atoms in the alkyl group in the other solvent systems.Metal dialkyldithiocarbamates in lubricating oils can be concentrated by silica gel and alumina adsorption chromatography, and they can be applied to prepare the sample for partition paper chromatography.
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