A detection method for forbidden dyes in 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 sensitizing and carcinogenic disperse dyes in ink, and more specifically relates to a detection method of prohibited dyes in ink. Background technique [0002] At present, there are more and more types of sensitizing 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, it is determined by liquid chromatography. [0003] The existing technology is mainly to extract the sample to be tested with methanol, and to measure it with high performance liquid chromatography. Articles such as "High Performance Liquid Chromatography Simultaneously Detect 7 Kinds of Banned Colorants in Cosmetics", "Allergenic Disperse Dyes and Sudan Red The research on high-performance liquid chromatography and liquid chromatography-mass spectrometry analysis methods of ...

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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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