title: Determination of the aromatic hydrocarbon to total hydrocarbon ratio of mineral oil in commercial lubricants.
abstract: A method was developed to determine the aromatic hydrocarbon to total hydrocarbon ratio of mineral oil in commercial lubricants; a survey was also conducted of commercial lubricants. Hydrocarbons in lubricants were separated from the matrix components of lubricants using a silica gel solid phase extraction (SPE) column. Normal-phase liquid chromatography (NPLC) coupled with an evaporative light-scattering detector (ELSD) was used to determine the aromatic hydrocarbon to total hydrocarbon ratio. Size exclusion chromatography (SEC) coupled with a diode array detector (DAD) and a refractive index detector (RID) was used to estimate carbon numbers and the presence of aromatic hydrocarbons, which supplemented the results obtained by NPLC/ELSD. Aromatic hydrocarbons were not detected in 12 lubricants specified for use for incidental food contact, but were detected in 13 out of 22 lubricants non-specified for incidental food contact at a ratio up to 18%. They were also detected in 10 out of 12 lubricants collected at food factories at a ratio up to 13%. The centre carbon numbers of hydrocarbons in commercial lubricants were estimated to be between C16 and C50.
authors.affiliation: a Tokyo Metropolitan Institute of Public Health , Shinjuku-ku , Tokyo , Japan.
authors.forename: Yoko
authors.initials: Y
authors.lastname: Uematsu
authors.affiliation: a Tokyo Metropolitan Institute of Public Health , Shinjuku-ku , Tokyo , Japan.
authors.forename: Kumi
authors.initials: K
authors.lastname: Suzuki
authors.affiliation: a Tokyo Metropolitan Institute of Public Health , Shinjuku-ku , Tokyo , Japan.
authors.forename: Mami
authors.initials: M
authors.lastname: Ogimoto
mesh_terms: D002851:Chromatography, High Pressure Liquid; D006841:Hydrocarbons, Aromatic / Q000032:analysis*; D054327:Lubricants / Q000737:chemistry*; D008899:Mineral Oil / Q000737:chemistry*; D052616:Solid Phase Extraction
chemical_list: D006841:Hydrocarbons, Aromatic; D054327:Lubricants; D008899:Mineral Oil
keywords: Lubricants; aromatic hydrocarbons; diode array detector (DAD); evaporative light scattering detector (ELSD); hydrocarbon; incidental food contact; mineral oil; normal-phase LC; refractive index detector (RID); silica gel; size exclusion chromatography (SEC); solid phase extraction (SPE)