Method for measuring phthalic anhydride transfer volume in food contact material and product

Abstract

The invention discloses a method for measuring phthalic anhydride transfer volume in a food contact material and a product. The method comprises the following steps: step one, preparing a standard product, and preparing a standard working solution, to-be-measured test solution and blank test solution; step two, respectively performing liquid chromatography measurement on the standard working solution, the to-be-measured test solution and the blank test solution in the step one by adopting a high-performance liquid chromatography; and drawing a standard working solution calibration curve by taking phthalic anhydride concentration in the standard working solution of food simulant as a horizontal coordinate and taking the correspondingly measured peak area of the phthalic anhydride as the longitudinal coordinate; step three, computing the phthalic anhydride concentration in the to-be-measured test solution according to a curve formula, and converting into the transfer volume of the phthalic anhydride through appropriate computation. The method disclosed by the invention can accurately measure the transfer volume of the phthalic anhydride in the food contact material, the quantitationis accurate and reliable, and the reproducibility is good.

Description

technical field [0001] The present invention relates to a method for measuring chemical substances in food contact materials and products, in particular to a method for measuring the migration of phthalic anhydride in food contact materials and products. Background technique [0002] Phthalic anhydride, referred to as phthalic anhydride, is a cyclic anhydride formed by intramolecular dehydration of phthalic acid. Phthalic anhydride is a white solid and is an important raw material in chemical industry, especially for the manufacture of plasticizers. Hardly soluble in cold water, easily soluble in hot water, ethanol, ether, benzene and most other organic solvents. In 1896, the German Baden Aniline Soda Ash Company first proposed the method of preparing phthalic anhydride by liquid-phase oxidation of naphthalene. In 1920, the German Von Heiden Chemical Company established a production device for the production of phthalic anhydride by gas-phase catalytic oxidation of naphtha...

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Problems solved by technology

[0004] At present, there are relatively few reports in the domestic literature on the detection of phthalic anhydride as the target substance. The current main method is to hydrolyze it into the corresponding acid, and quantify the anhydride by measuring the amount of hydrolyzed acid. However, it was found in the actual operation process that , In addition to phthalic anhydride, there are also alcoholysis products of phthalic anhydride conversion products in alcohol food simulants, if only phthalic acid is included in the calculation of phthalic anhydride migration, and ignoring Alcoholysis products, the test results for the migration of phthalic anhydride will be lower than the actual value, which will affect the compliance evaluation of food contact materials

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