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Application instruments:

Organic synthesis device CCX-3200, test tube concentration device TVE-1100, diaphragm pump DTC-22, cooling water CCA-1112, vacuum controller NVC-2300B.

People's living standards are improving day by day, and their consumption awareness is also constantly strengthening. Some high-quality and multifunctional clothing is increasingly favored by consumers. Azo dyes (a class of organic compounds with aromatic groups connected at both ends of the azo group) are the most widely used synthetic dyes in textile and clothing dyeing processes. They are used for dyeing and printing various natural and synthetic fibers, as well as for coloring paints, plastics, rubber, etc. Under special conditions, it can decompose and produce more than 20 carcinogenic aromatic amines, which can change the DNA structure of the human body through activation, causing lesions and inducing cancer. This type of dye is usually colorless and odorless, and cannot be perceived by the human sensory organs, and even its harm cannot be reduced through washing and other methods. Azo testing is one of the mandatory inspection items required by international environmental protection requirements. The standard stipulates that the tested product must not contain any intermediate of azo dyes. If one of them is detected, it is considered an unqualified product.

Applicable samples

Clothing, bedding, towels, wigs, false eyebrows, hats, diapers, and other cleaning and hygiene items, sleeping bags

Shoes, gloves, watch straps, handbags, various wallets, briefcases, chair covers

Textile or leather toys, toys with textile or leather clothing, synthetic dyes, organic compound dyes

■ Fabrics and yarns ultimately used by consumers

Experimental process

1.1 Take representative samples, take different parts, and cut a small piece.

1.2 Cut out a small piece and plug it into the ground mouth at the bottom of the condenser tube. Connect the condenser tube to a 50ml test tube, which contains 25ml of chlorobenzene. Place the test tube in an aluminum block heating bath (Tokyo Physicochemical Organic Synthesis Unit CCX-3200), heat to 180 ℃, condense and reflux for 30 minutes, and wash the dye in the sample into the test tube through continuous evaporation and condensation reflux.

1.3 Concentration: Place the test tube in the concentration device (Tokyo Physical and Chemical Test Tube Concentration Device TVE-1100, DTC-22, CCA-1112, NVC-2300B) for reduced pressure concentration. Set reaction conditions: water bath temperature 60 ℃, vacuum degree 60Pa, time 25-30 minutes, drain. After draining, rinse the test tube with 5ml of methanol.

1.4 Reduction reaction: Add a reducing agent (aqueous solution) to the rinsed test tube and undergo a reduction reaction for 30 minutes to eliminate the azo structure and reduce the aromatic product to obtain the target substance.

1.5 Detection: Gas chromatography-mass spectrometry GC-MS-SIS method for detecting components and analyzing spectra.