Determination of the aromatic hydrocarbon to total hydrocarbon ratio of mineral oil in commercial lubricants. Issue 3 (3rd March 2016)

• Record Type: Journal Article
• Authors: Uematsu, Yoko; Suzuki, Kumi; Ogimoto, Mami
• Is Part Of: Food additives & contaminants. Volume 33:Issue 3(2016)
• Page Start: 509
• Page End: 517
• Publication Date: 2016-03-03
• Subjects: Lubricants -- hydrocarbon -- aromatic hydrocarbons -- mineral oil -- incidental food contact -- normal-phase LC -- size exclusion chromatography (SEC) -- evaporative light scattering detector (ELSD) -- diode array detector (DAD) -- refractive index detector (RID) -- solid phase extraction (SPE) -- silica gel; Food additives -- Periodicals; Food contamination -- Periodicals; 664.06
• DOI: 10.1080/19440049.2015.1136434
• Languages: English
• ISSNs: 1944-0049

Abstract

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.