Methods were examined for the determination of small amounts of C8 to C10 alcohols in their phthalate esters involving the use of vanadium 8-hydroxyquinolinate in benzene or toluene and 3,5-dinitrobenzoyl chloride in pyridine as colorimetric reagents. Two modified procedures are presented that will reliably determine free alcohols in the 0路01 to 0路4 per cent. m/m range.
