Analysis of two lots of mineral oil indicated the overall composition to be quite similar with two major hydrocarbon ranges: a low range from Cl4 to Go with a maximum at C16 and a high range from GO to CJ0 with a maximum at Ga. The low range components represented 40.8 and 49.3 wt.x of Lots Q-9 and Q-lo, respectively. Urea fractionation of the paraffin-naphthene fraction from silica gel chromatography yielded 28.2 and 28.8 wt. for Lots Q-9 and Q-10, respectively. The nonadductable material consisted of highly branched and cyclic structures containing up to fourring systems. The total butyl phthalate content in Lots Q-9 and Q-10 was 13.2 and 7.0 p.p.m., respectively, with the ratio of monobutyl phthalate to dibutyl phthalate being 9 : l . No evidence was found to indicate the presence of polynuclear aromatic hydrocarbons.
Keyphrases 0 Mineral oils, adjuvant-separation, UV and mass spectrometry characterization 0 Phthalate esters-identification in adjuvant mineral oils 0 Adjuvant mineral oils-separation, UV and mass spectrometry characterization 0 GC-separation of mineral oil components UV spectrophotometry-characterization of mineral oils Mass spectroscopy-characterization of mineral oils 7 GC-mass spectrometry analyses were carried out on a Perkin-Elmer model 881 gas chromatograph coupled to a Hitachi-Perkin-Elmer RMU-6D mass spectrometer.
8 Cary model 14.