Standard sample preparation method for detection of specific migration of restricted substances in polyethylene film

Abstract

The invention provides a preparation method of a standard sample for the specific migration quantity detection on restricted substances in a polyethylene film. The preparation method comprises the following steps: uniformly mixing specific migration substances and a blow molding grade polyethylene resin raw material, and manufacturing master batches by using a double-screw extruder; then mixing the master batches and the polyethylene resin raw material in a set proportion, regulating the pulling speed by using a blow molding machine to obtain the polyethylene film with a certain thickness, and carrying out series treatment on the film to obtain the standard sample. The standard sample has the good uniformity and stability, can be used for comparing interlaboratory specific migration quantity detection data of the restricted substances in the polyethylene film, verifying the accuracy of the method, calibrating test instruments, controlling the quality and assessing test results. The preparation method is low in material cost and simple; the obtained standard sample is a material standard sample, is uniform and stable, and is easy to store.

Description

technical field [0001] The invention relates to a method for preparing a standard sample, in particular to a method for preparing a standard sample for detecting the specific migration amount of a restricted substance in a polyethylene film, and belongs to the technical field of analytical chemistry. Background technique [0002] With the development of science and technology, the awareness of global environmental protection and the enhancement of food quality and safety awareness, people are increasingly concerned about the hygiene and safety of plastic food packaging widely used. The European Union, the United States, Japan, etc. have all formulated relevant hygienic standards, and specified specific migration limits (Specific migration limits, SML) for commonly used additives. The "Food Safety Law" implemented in 2009 incorporated food packaging into food safety. This is the first time in China that food packaging safety has been established in the form of law. Due to th...

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Problems solved by technology

At present, although most of the experiments in my country have the ability to detect restricted substances in food packaging and are also engaged in detection work in this area, there is no standard substance (sample) for restricted substances in plastic packaging of food contact materials in my country. There are also fewer types of reference materials (samples) in this regard. In the International Reference Material Information Bank, the National Institute of Standards and Technology (NIST), the European Union Standard Material Information Platform (IRMM), the British Analytical Chemistry Standards Testing Laboratory (LGC ) and other major standard material development and supply organizations in the world, there are only standard samples of element content in certain plastic materials or standard samples of total migration

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