Method for detecting banned dye in printing ink

Abstract

The invention provides a method for detecting banned dye in printing ink. The method comprises the following steps of S1, weighing a sample, extracting by adding extract liquor in the sample, and obtaining a to-be-detected sample after concentrating, volume metering and filtering; S2, carrying out qualitative and quantitative analysis on the to-be-detected sample obtained in S1 through an UPLC (Ultra-high Performance Liquid Chromatography)-diode array-mass spectrum combination method, wherein a mass / volume ratio of the sample to the extract liquor in S1 is 1:(15 to 25), the extract liquor is a mixed solution of tetrahydrofuran and methyl alcohol, and a volume ratio of the retrahydrofuran to the methyl alcohol is 1:(3 to 5). According to the method provided by the invention, five kinds of banned dye in the printing ink can be detected in 15 minutes, the linearity within a concentration range being 0.1 to 10 mg / L is good, linear correlation coefficients of the five kinds of banned dye are all greater than 0.995, the detection limit is up to 0.1 mg / L, the relative standard deviation is less than 5 percent, and the sample standard addition recovery is 85 percent to 110 percent.

Description

Technical field [0001] The invention belongs to the technical field of detection of allergenic and carcinogenic disperse dyes in inks, and more specifically, relates to a detection method for prohibited dyes in inks. Background technique [0002] At present, there are more and more types of allergenic and carcinogenic disperse dyes, which are mainly used in printing, ink, wood, silk, paper, textile, plastic and polyester fiber dyeing to achieve various dyeing effects. Due to the nature of the dye itself, liquid chromatography is used for determination. [0003] The prior art mainly uses methanol to extract the sample to be tested, and uses high performance liquid chromatography for determination. Articles such as "High Performance Liquid Chromatography Simultaneous Detection of 7 Prohibited Colorants in Cosmetics", "Allergenic Disperse Dyes and Sudan Red Research on dyes' high-performance liquid chromatography and liquid-mass spectrometry analysis methods, etc., through optimizati...

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Problems solved by technology

[0004] Due to the time-consuming high-performance liquid chromatography, the substances in this study were extracted with methanol, and the average recovery rate was 62%-81%. The extraction efficiency was low, and the purpose of the test could not be achieved. The method needs to be improved.

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