Breakthrough For Fast Detection Of Banned Azo Dyes In Textiles

< p > Shandong national inspection and Quarantine Bureau completed the AQSIQ science and technology project "research and development of fast detection kit for harmful substances in ecological textiles", systematically studied the colorimetric determination of banned azo dyes in textiles, developed a simple, fast, no need for large-scale instruments and equipment, high sensitivity dyestuff azo dyes fast screening and testing kit, and made a major breakthrough in the detection technology of banned azo dyes in dyed textiles, and opened up a convenient, fast and applicable method for rapid qualitative screening.

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< p > < strong > the traditional technology cycle is long and the cost is high < /strong > < /p >.

< p > China's mandatory national standard GB 18401 "national a href=" http://www.91se91.com/news/index_c.asp "> textile products < /a > basic safety technical specifications", "German food and consumer goods act", the EU's Eco-Lable and the most widely used textile ecological logo Oeko-Tex Standard 100 "eco textile standard 100" and many other domestic and foreign laws and regulations have been listed as prohibited, and become one of the most important items of import and export textiles.

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< p > the types of carcinogenic aromatic amines currently banned have been increased to 24. In addition to the slightly different detection methods for 4- azobenzene, the detection of the other 23 aromatic amines can be carried out simultaneously.

For the detection of banned azo dyes, the conventional method is to determine the samples after gas chromatography, liquid chromatography, gas chromatography-mass spectrometry, liquid chromatography / mass spectrometry and other chromatographic instruments.

The method is mature, accurate and sensitive.

However, the pre-processing is complex, needs to be equipped with precision instruments, the inspection cycle is longer, the inspection cost is high, and there must be professional technicians and harsh conditions.

In recent years, the detection of banned azo dyes in textiles shows that, on the one hand, the volume of testing business has doubled, and the detection pressure has increased dramatically. On the other hand, the positive detection rate has been decreasing year by year, and the work of accurate quantitative analysis has been greatly reduced.

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< p > to solve the above problems, it is urgent to establish a fast screening method without the need to rely on a large chromatographic instrument with simple procedure and low cost.

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< p > < strong > fast and cheap screening < a href= > http://www.91se91.com/news/index_c.asp > aromatic amine > /a > /strong > /p >

< p > banned azo dye detection kit technology, a fast detection method of banned azo dyes in textiles was proposed, which solved the dependence of traditional methods on large-scale chromatographic instruments, and met the needs of current rapid screening.

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< p > the technology of the kit is based on the structural characteristics of aromatic amine, introducing the mechanism of diazo coupling reaction, effectively optimizing the conditions of diazotization reaction and coupling reaction, using tert butyl ether and hydrochloric acid liquid liquid extraction technology to achieve aromatic amine extraction and reaction liquid decolorization, and using methoxy phenol as chromogenic agent to determine aromatic amines by chromogenic reaction.

A fast screening and testing method for banned azo dyes in dyed textiles has been established, and a major breakthrough has been made in the detection of banned azo dyes in dyed textiles.

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The technology is compared with the current domestic and international methods of detecting < a href= "http://www.91se91.com/news/index_c.asp" > azo dye < /a >: no need for any chromatographic instrument, the equipment needed is only a reduction water bath pot, the instrument cost is less than 1% of the existing instrument detection method, the pretreatment steps are simplified to two steps of reduction and extraction decolorization, the operation is simple, and the time for detecting 1 samples is only 34% to 40% of the existing methods; no aromatic amine standard and diatomite extraction columns are needed, the reagent consumption is less, and the reagent cost is only 3%-8% of the existing detection methods. Taking the Shandong inspection and Quarantine Bureau Technology Center as an example, in 2011, a total of 4000 batches of azo samples were detected, and only one reagent could be used to save 220 thousand of the cost. < p >

The method is simple, fast and low cost.

A fast screening test for textiles banned azo dyes has been realized.

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< p > < strong > the research results have broad application prospects < /strong > < /p >.

< p > the technology has been tested in thousands of practical samples at the technical inspection center of Shandong inspection and Quarantine Bureau. At the same time, it has been verified at the Jiangxi entry exit inspection and Quarantine Bureau Technology Center, Jiangsu entry exit inspection and Quarantine Bureau Technology Center, Zhejiang entry exit inspection and Quarantine Bureau Technology center, Shanghai Tianxiang gathering group, Qingdao textile fiber inspection institute, Shandong inspection and Certification Group Shandong Inspection Co., Ltd. 6 units.

The research team took the kit and the experimental personnel, and sampled more than 20 blind samples from each daily test sample for on-site testing. The results of the kit test were compared with the results of the actual instruments.

The results were as follows: 42 positive samples were detected, the detection rate was 100%, no false negative.

False positive results were detected in 285 of the 1040 negative samples, and the probability of false positive was 27%.

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< p > March 2013, at the textile professional committee meeting and the standard verification meeting, the technology was introduced again because of the opening of the standard. The Beijing inspection and Quarantine Bureau, the Shanghai inspection and Quarantine Bureau, the Zhejiang inspection and Quarantine Bureau, and the Shenzhen inspection and Quarantine Bureau were very interested in the first-line brothers unit of textile dyestuff dye detection. They asked for a kit to let them go back and try it.

At present, 3 units have been applied and feedback results. The general reaction method is simple, fast and practical, and it is recommended to be pformed into product promotion and application as soon as possible.

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< p > the application prospect of this project is broad.

On the one hand, for testing institutions, it can shorten the inspection cycle of textile and clothing, reduce inspection costs, and meet the current high throughput and low cost testing requirements.

On the other hand, the inspection of harmful substances in textiles and garments can be extended to factories, workshops, warehouses and goods factories.

The textile industry in China has the characteristics of small scale and large quantity. Rapid detection is conducive to the selection of raw materials, the improvement of product quality and the market competitiveness of enterprises. It helps enterprises to control quality and reduce losses, which is of great significance for protecting the health of our people and ensuring the export of foreign trade.

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< p > the research group applied for the national invention patent "dyed azo dye fast detection method in dyed textiles" and was authorized (Patent No.: ZL 201110350255.7).

"The rapid determination of banned azo dyes in textiles" (2012B406) has been pformed into the industry standard for inspection and quarantine. It is published in the Journal of analytical chemistry, which is the most influential factor in the domestic chemical journals. "The fast qualitative screening method of banned azo dyes in textiles based on diazo coupling reaction" is cited by SCI.

With the help of patents, standards and articles, extensive and effective promotion has been carried out inside and outside the industry.

The research group was also invited to participate in the 2013 International Conference on inspection and testing technology and equipment and the National Conference on inspection and testing.

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