Method for detecting banned azo dyes in printing ink, coatings and paint

Abstract

The invention provides a method for detecting banned azo dyes in printing ink, coatings and paint. The method comprises the following steps: performing reduction and decomposition on a sample in a sodium citrate buffer solution medium in the presence of sodium hydrosulfite to generate possible banned aromatic amine, then extracting aromatic amine from an extracting solution by a liquid-liquid extraction method, and detecting by GCMS with a mass selection detector. According to the method, methyl alcohol is used to extract disperse dyes in the sample, so that the disperse dyes in the sample can be extracted as much as possible, and other impurities in the sample are prevented from being extracted overmuch. A sodium hydroxide solution is added into a test tube so as to neutralize to obtain proper pH, and a generated amine substance is relative stable under the pH condition. Five milliliters of tert-butyl methyl ether is added to facilitate liquid-liquid extraction. A moderate amount of sodium sulfate is added so as to absorb water, accelerate layering and facilitate removing of part of impurities in an organic phase.

Description

technical field [0001] The invention relates to a detection method, in particular to a detection method of prohibited azo dyes in inks, coatings and paints. Background technique [0002] Azo dyes are the dyes with the largest number of varieties in the current dye market. They are named after the azo groups contained in the dye molecules. It is widely used in the dyeing and printing of various natural and synthetic fibers, and also in the coloring of paint, plastic, rubber, etc. After long-term contact with human skin, these clothing or other consumer products dyed with prohibited azo dyes will mix with the components released during metabolism and undergo a reduction reaction to form carcinogenic aromatic amine compounds, which will be absorbed by the human body. After a series of activation, the DNA of human cells undergoes structural and functional changes, becoming the cause of human disease. The current banned azo dyes are mainly tested for leather and textiles, and t...

AI Technical Summary

Problems solved by technology

The current banned azo dye test objects are mainly for leather and textiles, and there are few azo dye tests directly for ink, paint, coating, etc.