GB 31604.30-2025 National food safety standard -Food contact materials and articles - Determination of phthalate esters and their migration amount
1 Scope
This standard specifies the determination methods for 19 phthalate esters in food contact materials and articles, including dimethyl phthalate (DMP), diethyl phthalate (DEP), diallyl phthalate (DAP), diisobutyl phthalate (DIBP), dibutyl phthalate (DBP), bis(2-methoxyethyl) phthalate (DMEP), bis(4-methyl-2-pentyl) phthalate (BMPP), bis(2-ethoxyethyl) phthalate (DEEP), dipentyl phthalate (DPP), dihexyl phthalate (DHXP), butylbenzylphthalate (BBP), bis(2-butoxyethyl) phthalate (DBEP), dicyclohexyl phthalate (DCHP), bis(2-ethylhexyl) phthalate (DEHP), diphenyl phthalate (DPhP), di-n-octyl phthalate (DNOP), dinonyl phthalate (DNP), diisononyl phthalate (DINP-1) and 1,2-benzenedicarboxylic acid, di-C8-10-branched alkyl esters, C9-rich (DINP-2), as well as diisodecyl phthalate (DIDP-1) and 1,2-benzenedicarboxylic acid, di-C9-11-branched alkyl esters, C10-rich (DIDP-2). It also specifies the methods for determining their migration amounts.
Part I "Determination of phthalate esters" is applicable to the determination of 19 phthalate esters in food contact materials and articles such as plastics, rubber, paints and coatings, and adhesives. Part II "Determination of migration amounts of phthalate esters" is applicable to the determination of migration amounts of 19 phthalate esters in food contact materials and articles.
Part I Determination of phthalate esters
2 Principle
Phthalate esters in food contact materials and articles are extracted using tetrahydrofuran as a solvent with ultrasonic assistance. For soluble specimens, polymers and other substances are precipitated with n-hexane, and the extract is subjected to centrifugal separation and concentration, and diluted to the scale before being analyzed by gas chromatography-mass spectrometry; for insoluble specimens, repeated extraction is performed with tetrahydrofuran, and the extract is subject to concentration and diluted to the scale before being analyzed by gas chromatography-mass spectrometry. The retention time and characteristic ions are used for qualitative analysis, and the external standard method is used for quantitative analysis.
3 Reagents and materials
Unless otherwise specified, all reagents used in this method shall be of chromatographic grade or analytical grade reagents verified by the blank test to show no phthalate esters under test. The water is Class-I water as specified in GB/T 6682. During the test process, the use of plastic utensils shall be avoided. Alternatively, plastic utensils verified by the blank test to show no phthalate esters under test may be used.
3.1 Reagents
Foreword i 1 Scope 2 Principle 3 Reagents and materials 4 Apparatus 5 Analytical procedures 6 Expression of analysis results 7 Precision 8 Others 9 Principle 10 Reagents and materials 11 Apparatus 12 Analytical procedures 13 Expression of analysis results 14 Precision 15 Others Annex A Information on 19 phthalate esters Annex B Quantitative and qualitative selective ion of 19 phthalate esters Annex C Reference GC-MS chromatogram of standard solution of phthalate esters
