ISO 14362-3 Textiles - Detection of Use of Certain Azo Colorants That Can Reveal Aminoazobenzene

The ISO 14362-3 standard, published by the International Standards Organization (ISO), is a supplement to the ISO 14362-1 standard and describes specific test methods for detecting the use in commodities of certain azo colorants capable of releasing 4-aminoazobenzene. In these methods,

• It is accessible without extraction by the reducing agent, especially with respect to textiles made from cellulose and protein fibers (eg cotton, viscose, wool and silk).
• Accessible by removing fibers (eg polyester or artificial leather).

The presence of these 4-aminoazobenzene colorants cannot be reliably detected, for example, without knowledge of the chemical structure of the colorant used or without a special procedure. Extractive and non-shrinking methods may be required for some fiber blends.

Aminoazobenzenes are a class of compounds that contain the azo group and make them colored. Azo compounds are used as dyestuffs for fabrics, lacquers and foods. For example, 4-dimethylaminoazobenzene is an aminoazobenzene compound known as butter yellow for coloring margarine. However, these compounds have been found to be carcinogenic in animals.

In general, the 4-aminoazobenzene compound is used as a paint for lacquers, varnishes, wax products, oil stains, and styrene resins. It is also used as an intermediate in the production of acid yellow, diazo dyes and indulins. This compound is also used in yellow pigments, including inks for inkjet printers.

A textile sample properly colored according to ISO 14362-3 is tested using the colorant extraction method for disperse dyes or the direct reduction method for other dye classes. The textile sample or the residue of the sample extraction is treated with sodium dithionite in an alkaline solution at 40 degrees in a closed container. The 4-aminoazobenzene released during this process is transferred to a methyl ether phase via liquid-liquid extraction. Detection of 4-aminoazobenzene is performed using chromatography. If 4-aminoazobenzene is detected by a chromatographic method, verification should be performed using one or more alternative methods.

Among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors, our organization also provides testing services for the use of certain azo colorants that can release 14362-aminoazobenzene, within the scope of ISO 3-4 standard, with its trained and expert staff and advanced technological equipment. .