抄録
Various kinds of phosphates are widely used as additives for gasolines and lubricating oils.
This paper deals with the separation and identification of trialkyl phosphates having carbon atoms up to eight in the alkyl group and triaryl phosphates having methyl substituted radicals up to two in the aryl group by partition paper chromatography.
It has been found that the solvent systems of chlorinated paraffin (40% Cl) (stationary phase) -100% ethyl alcohol (mobile phase) and chlorinated paraffin (40% Cl) or alkyl naphthalene (stationary phase) -80% ethyl alcohol (mobile phase) are suitable for partition paper chromatography of these phosphates.
The Rf values of these phosphates become smaller with increase in the number of carbon atoms in the alkyl group or methyl substituted radicals in the aryl group.
The Rf values of triaryl phosphates are smaller than those of trialkyl phosphates in the solvent system of chlorinated paraffin (40% Cl) -100% ethyl alcohol, therefore, it is possible to discriminate triaryl phosphates from trialkyl phosphates. For the identification of each phosphate, the solvent system of chlorinated paraffin (40% Cl) or alkyl naphthalene-80% ethyl alcohol is suitable.
Phosphates in lubricating oils can be applied to partition paper chromatography through concentrating there of by silica gel adsorption chromatography.
