GB/T 23973-2018Determination of formaldehyde in dye products (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 23973-2009 "Determination of formaldehyde in dye products". Compared with GB/T 23973-2009, except editing The main technical changes outside the sexual modification are as follows:

--- Added a method for the determination of formaldehyde in dye products by high performance liquid chromatography (see 3.2). This standard was proposed by the China Petroleum and Chemical Industry Federation. This standard is under the jurisdiction of the National Dyestuff Standardization Technical Committee (SAC/TC134). This standard was drafted. Zhejiang Dibang Chemical Co., Ltd., Taizhou Qianjin Chemical Co., Ltd., China Chemical Economic and Technological Development Center, Shenyang Chemical Research Institute Co., Ltd., National Dyestuff Quality Supervision and Inspection Center. The main drafters of this standard. Pu Aijun, Xu Wanfu, Chen Guangshun, Xue Yan, Fu Weisong, Chen Rigang, Yang Zhenmei, Chen Sujuan. The previous versions of the standards replaced by this standard are.

---GB/T 23973-2009. Determination of formaldehyde in dye products Caution - Personnel using this standard should have practical experience in laboratory work. This standard does not address all security issues. use It is the responsibility of the person to take appropriate safety and health measures and to ensure compliance with the conditions set by the relevant national regulations.

1 Scope

GB/T 23973-2018 gives the methods for determining formaldehyde in dye products, the residue that decides whether a dye can be used on textiles that touch the skin. Two methods are laid down. The spectrophotometric method, which is the arbitration method, distils the free formaldehyde out of the sample into an aqueous solution, develops the colour with acetylacetone and reads it on a spectrophotometer; the standard fixes the reagents down to the preparation and the shelf life of the acetylacetone solution, which is stored at 0 °C to 5 °C in the dark, is used only after twelve hours and remains valid for six to eight weeks. The second method, added in this edition, is high performance liquid chromatography. Reagents are analytical grade and the water is grade three of GB/T 6682-2008; standard titration solutions are prepared to GB/T 601 and the results are judged by the rounding value comparison method of GB/T 8170-2008. This edition replaces GB/T 23973-2009, from which it differs by the addition of the chromatographic method.

This standard specifies the method for determining formaldehyde in dye products. This standard applies to the determination of formaldehyde in dye products.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. Preparation of

GB/T 601 chemical reagent standard titration solution

GB/T 6682-2008 Analytical laboratory water specifications and test methods ( ISO 3696.1987, MOD)

GB/T 8170-2008 Numerical rounding rules and the representation and determination of limit values