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A detection method of benzotriazole ultraviolet absorber in plastic products

A technology of benzotriazole violet and detection method, which is applied to measurement devices, instruments, scientific instruments and other directions, can solve problems such as low efficiency and inability to achieve recovery, and achieves low detection limit, good linearity and good reproducibility Effect

Active Publication Date: 2018-08-31
GUANGZHOU GRG METROLOGY & TEST CO LTD
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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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  • A detection method of benzotriazole ultraviolet absorber in plastic products

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Embodiment 1

[0049] (1) Pretreatment of samples

[0050] Take a sample from the clean part of the sample, cut it into pieces to 2mm×2mm×2mm, weigh 1g±0.1g (accurate to 0.1mg) of the sample into a 60ml glass reaction bottle, add 10ml of toluene, extract for 50min±5min, repeat the above operation once , combine the two extracts, mix well, concentrate to about 2ml with a rotary evaporator, slowly blow nitrogen to near dryness, and dilute to 1ml with toluene, and finally filter the extract through a 0.45um microporous membrane to obtain the sample.

[0051] (2) Preparation of standard solution

[0052] Accurately weigh eight standard benzotriazole UV absorbers (UV-P, UV-320, UV-326, UV-327, UV-328, UV-329, UV-234, UV -360) about 0.01g each (the specific weighing amount should be calculated according to the purity), add it to a 10ml volumetric flask, dissolve it with toluene to make up a mixed standard stock solution of 1000mg / L, and then dilute it step by step to 0.1mg / L , 0.5 mg / L, 1 mg / L,...

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Abstract

The invention provides a method for detecting benzotriazole ultraviolet absorbers in plastic products, comprising the following steps: S1. Adding a sample to toluene for extraction, preparing an extract, constant volume, and filtering to obtain a sample to be tested; S2 . The sample to be tested obtained in S1 is detected by gas chromatography-mass spectrometry, and the content of benzotriazole ultraviolet absorber is calculated; the mass volume ratio of the sample to toluene in the S1 is 1: (8~12); the present invention can simultaneously detect Eight kinds of benzotriazole ultraviolet absorbers, and a good separation effect was obtained within 17 minutes. The method has low detection limit, good reproducibility, high recovery rate of standard addition, good linearity in the concentration range of 0.1-10mg / L, linear correlation coefficient can reach 0.999, detection limit reaches 0.1mg / L, and the repeatability is relatively standard The deviation is less than 3%, and the recovery rate of the sample addition 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02G01N30/06
Inventor 王华李支薇任祥祥王海鸣
Owner GUANGZHOU GRG METROLOGY & TEST CO LTD
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