摘要：A method for the determination of total phthalates as di-trifluoroethyl phthalate by gas-liquid chromatography is described. It was developed on the basis of separation of phthalates from samples with n-hexane, saponification of the phthalates with an alkaline ethanolic solution, purification of phthalic acid by extraction with ethyl acetate and by silica gel column chromatography and conversion of phthalic acid obtained thereby to di-trifluoroethyl ester with trifluoroethanol and boron trifluoride which is highly sensitive to an electron capture detector. The derivative was detected on the chromatogram with sensitivity of 0.1 pg, and fatty samples fortified at levels from 0.1 to 10μg of phthalates were successfully analyzed at recovery of 85-105%.
