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DEFINITION This method is used for the determination of fatty acid esters of 2-chloropropane-1,3-diol (2-MCPD), 3-chloropropane-1,2-diol (3-MCPD) and glycidol in edible oils and fats; see also AOCS Official Methods Cd 29b-13 or Cd 29c-13. Glycidyl esters are converted to 3-monobromopropanediol (3-MBPD) monoesters in an acid solution containing a bromide salt. 3-MBPD esters, together with 2- and 3-MCPD esters, are then converted into the free (non-esterified) form in acid methanolic solution. The fatty acid methyl esters generated during the reaction are extracted from the sample; and 2- and 3-MCPD as well as 3-MBPD, are then derivatized with phenylboronic acid prior to GC-MS analysis. SCOPE Applicable for the determination of 2- and 3-MCPD fatty acid esters and glycidyl fatty acid esters (as a sum of all the respective esters) in edible oils/fats.