Method for detecting azo dyes in crocodile leather products and evaluation system constructing method
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A technology for the detection of banned azo dyes, applied in the field of detection methods and evaluation system construction of banned azo dyes in crocodile skin products, can solve the problems of low detection accuracy, long pretreatment time, cumbersome detection process, etc.
Inactive Publication Date: 2019-09-20
GUANGDONG TESTING INST OF PROD QUALITY SUPERVISION
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[0003] The traditional detection method of banned azo dyes has the disadvantages of long pretreatment time, cumberso
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Embodiment 1
[0056] A detection method for prohibited azo dyes in crocodile skin products:
[0057] Sample preparation: Take a belt made of crocodile skin, cut it into a small sample of about 5 mm × 5 mm, mix it, take 1 g of the small sample, put it in a sealed reactor, add 17 mL of 0.06 mol / L preheated at 70 ° C, pH 6.0 The citrate buffer solution was mixed to obtain a sample treatment solution, and the reactor was kept at 70° C. for 30 minutes.
[0058] Reduction reaction: Add 3 mL of 200 mg / mL sodium dithionite aqueous solution to the reactor, then continue to place the reactor in a constant temperature water bath at 70°C for 30 min, and then cool to room temperature in an ice-water bath to obtain a reducing solution.
[0059] Extraction: Take 5mL of the above reducing solution in a 10mL centrifuge tube with stopper, add sodium thiosulfate with a mass fraction of 3%, pre-mix 1.0mL acetone and 200μL chloroform, inject it into the bottom of the centrifuge tube, shake it by hand After osc...
Embodiment 2
[0062] A detection method for prohibited azo dyes in crocodile skin products:
[0063] The detection method of the prohibited azo dyes in Example 2 is substantially the same as in Example 1, except that the extraction process is different. Extraction: take 5 mL of the above-mentioned reducing solution in a 10 mL centrifuge tube with a stopper, add a mass fraction of For 5% sodium thiosulfate, mix 1.2mL acetone and 200μL chloroform in advance, inject it into the bottom of the centrifuge tube, shake it by hand for 3min, and place it at a set speed of 4000r·min -1 centrifuge on a centrifuge for 10 min, and after the layers are separated, discard the upper aqueous solution and keep the lower organic phase.
Embodiment 3
[0065] A detection method for prohibited azo dyes in crocodile skin products:
[0066] The detection method of prohibited azo dyes in Example 3 is substantially the same as in Example 1, except that the extract is tetrachloromethane, and the dispersion is acetone.
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Abstract
The invention relates to a method for detecting azo dyes in crocodile leather products and an evaluation system constructing method. The method for detecting the azo dyes in the crocodile leather products comprises the following steps that: a leather sample and a preheated citrate buffer solution are mixed, so that a sample treatment liquid is obtained, primary heat preservation is performed on the sample treatment liquid, a sodium hydrosulfite aqueous solution is added into the sample treatment liquid, and the sodium hydrosulfite aqueous solution and the sample treatment liquid are mixed uniformly, and secondary heat preservation is performed on an obtained mixed liquid, and the mixed liquid cools to room temperature, so that a reducing liquid can be obtained; a dispersing liquid and an extracting liquid are added into the reducing liquid, and the dispersing liquid, the extracting liquid and the reducing liquid are uniformly mixed, an obtained mixed liquid stands still, and is subjected to centrifugation, an underlying organic phase is taken and is adopted as a liquid for testing, and the volume ratio of the reducing liquid, the dispersion liquid and the extracting liquid is (490-510):(80-120):(18-22); and the liquid for testing is subjected to gas chromatography-mass spectrometry analysis. Compared with a traditional column chromatography extraction, the detection method disclosed by the invention is advantageous in improved sample recovery rate, thereby improving the detection accuracy of forbidden azo dyes in crocodile leather products.
Description
technical field [0001] The invention relates to the field of detection of crocodile skin products, in particular to a detection method of prohibited azo dyes in crocodile skin products and a construction method of an evaluation system. Background technique [0002] Azo dyes are a type of synthetic dyes widely used in the processing of crocodile skin products. Among azo dyes, dyes that can release carcinogenic aromatic amines are usually called banned azo dyes. Aromatic amines in banned azo dyes are recognized as one of the necessary indicators to evaluate the quality of crocodile leather products due to their high carcinogenicity. [0003] The traditional detection method of banned azo dyes has the disadvantages of long pretreatment time, cumbersome detection process, and low detection accuracy. A detection method with high detection accuracy is urgently needed. Contents of the invention [0004] The invention provides a method for detecting prohibited azo dyes in crocodi...
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IPC IPC(8): G01N30/86G01N30/06
CPCG01N30/06G01N30/8675G01N2030/025
Inventor 胡敏专韩健健胡勇丽
Owner GUANGDONG TESTING INST OF PROD QUALITY SUPERVISION
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