NF EN ISO 20122, T60-289 (04/2024)

This document specifies a procedure for the determination of saturated and aromatic hydrocarbons (from C10 to C50) in vegetable fats and oils using high performance liquid chromatography and gas chromatography coupled to a carbon dioxide ionization detector. flame (HPLC-CG-FID) online. This document does not apply to other matrices. The method is applicable to the analysis of mineral oil saturated hydrocarbons (MOSH) and/or mineral oil aromatic hydrocarbons (MOAH). Based on the results of interlaboratory studies, it was demonstrated that the method is suitable for mass concentrations of MOSH above 3 mg/kg and mass concentrations of MOAH above 2 mg/kg. If interferences are suspected, the fossil origin of the MOSH and MOAH fractions can be verified by examination by two-dimensional gas chromatography coupled with mass spectrometry (GC?CG-MS). An alternative method for epoxidation of the MOAH fraction (epoxidation using performic acid) is proposed in Appendix C. This method gives results comparable to the ethanolic epoxidation of the MOAH fraction described in 8.6. This alternative epoxidation method has been shown to be effective for samples with strong interferences in the MOAH fraction (e.g., tropical oils).
(Automatic translation from French)