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BS EN ISO 20122:2024

BS EN ISO 20122:2024

$198.66

Vegetable oils. Determination of mineral oil saturated hydrocarbons (MOSH) and mineral oil aromatic hydrocarbons (MOAH) with online-coupled high performance liquid chromatography gas chromatography-flame ionization detection (HPLC-GC-FID) analysis. Method for low limit of quantification

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BSI 2024 52
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This document specifies a procedure for the determination of saturated and aromatic hydrocarbons (from C10 to C50) in vegetable fats and oils using the online-coupled high performance liquid chromatography-gas chromatography-flame ionization detection (HPLC-GC-FID).[4][5][6] This document does not apply to other matrices. The method is applicable for the analysis of mineral oil saturated hydrocarbons (MOSH) and/or mineral oil aromatic hydrocarbons (MOAH). According to the results of the interlaboratory studies, the method has been proven suitable for MOSH mass concentrations above 3 mg/kg and MOAH mass concentrations above 2 mg/kg. In case of suspected interferences, the fossil origin of the MOSH and MOAH fraction can be verified by examination by GC?GC-MS. An alternative method for the epoxidation of the MOAH fraction (performic acid epoxidation) is proposed in Annex C. This alternative method provides comparable results to the ethanolic epoxidation of the MOAH fraction described in 8.6. This alternative method for epoxidation has proven to be efficient for samples with a high amount of interferences in the MOAH fraction (e.g. tropical oils).[14]

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PDF Pages PDF Title
2 undefined
15 7.1 Sampling
7.2 Preparation of the final sample for liquid and solid fats
16 8.1 General
8.2 Hexane/ethanol distribution for removal of interfering substances
8.3 Saponification
17 8.4 Removal of biogenic n-alkanes with aluminium oxide for determination of the MOSH fraction
8.5 Clean-up before epoxidation to separate polar substances
8.6 Ethanolic epoxidation of the MOAH fraction to oxidize unsaturated non-aromatic compounds
18 8.7 HPLC-GC separation
8.7.1 HPLC conditions
8.7.2 GC configuration
19 8.7.3 Solvent vapour exit configuration
8.7.4 Peak identification
20 8.7.5 System suitability test
21 8.8 Blank run
8.9 Quality control
9.1 Testing the chromatograms for sufficient epoxidation and other relevant parameters
22 9.2 Calculation
23 10.1 Repeatability limit
10.2 Reproducibility limit

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BS EN ISO 20122:2024
$198.66