Method for detecting benzotriazole ultraviolet absorbent in plastic product

Abstract

The invention provides a method for detecting a benzotriazole ultraviolet absorbent in a plastic product. The method comprises the following steps: S1, adding a sample into methylbenzene to perform extraction to prepare an extracting liquid, making up the volume, and filtering to obtain a to-be-detected sample; and S2, performing gas chromatography-mass spectrometry detection on the to-be-detected sample obtained in the step S1 and calculating the content of the benzotriazole ultraviolet absorbent, wherein a massic volume ratio of the sample in the step S1 to methylbenzene is 1 to (8-12). According to the method, eight benzotriazole ultraviolet absorbents can be detected simultaneously and a very good separation effect can be obtained within 17 minutes; the method is low in detection limit, good in reproducibility and high in added recovery rate; and the linearity is good within a concentration range of 0.1-10mg / L, linear correlation coefficients all can reach 0.999, the detection limit reaches 0.1mg / L, the relative standard deviation of repeatability is less than 3%, and the sample added recovery rate is 95-110%.

Description

technical field [0001] The invention belongs to the technical field of detection of benzotriazole ultraviolet absorbers, and more specifically relates to a detection method of benzotriazole ultraviolet absorbers in plastic products. Background technique [0002] At present, the detection of benzotriazole substances is mainly aimed at the fields of surface water, food, textiles, etc., and liquid chromatography is mostly used for determination, and the detection of benzotriazole substances in surface water mainly adopts the method of solid phase extraction. , There are also gas chromatography for detection, but it is limited to the determination of one or two substances, so the practical application value is not great. [0003] The article "Gas Chromatographic Determination of 2-(2'Hydroxy-3',5'-Di-tert-butylphenyl)-Benzotriazole Content in Textiles" mentioned that it is a textile UV-320 detection method, which uses However, GC-FID is used for determination, which can only be...

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Problems solved by technology

[0004] The article "Determination of Triazole Light Stabilizer Content in Composite Food Packaging Bags by High Performance Liquid Chromatography" uses methanol to perform ultrasonic extraction on packaging materials, and uses high performance liquid chromatography to determine the content of UV326 and UV327. This method only determines the two This substance is extracted with methanol. In fact, the extraction efficiency with methanol is not high. This can be seen from the solubility of UV326 and UV327 in methanol. For example, the solubility of UV-326 in methanol at room temperature is only 0.1 g / 100ml, the actual recovery rate obtained by the author is also between 75% and 90%, which cannot achieve a good recovery, so methanol extraction is not the best choice

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