GB/T 26713-2025Footwear - Chemical tests - Determination of dimethyl fumarate (DMFu) (English PDF)

Foreword

This document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives

for Standardization - Part 1.Rules for the Structure and Drafting of Standardizing Documents.

This document serves as a replacement for GB/T 26713-2011 Footwear - Chemical Tests -

Determination of Dimethyl Fumarate (DMF). In comparison with GB/T 26713-2011, apart

from structural adjustments and editorial modifications, the main technical changes are as

follows.

a) The "Principle" is modified (see Chapter 4; Chapter 3 of Version 2011);

b) The "Reagents and Materials" is modified (see Chapter 5; Chapter 4 of Version 2011);

c) The "Instruments and Equipment" is modified (see Chapter 6; Chapter 5 of Version

2011);

d) The sampling requirements are modified (see Chapter 7; 6.1 of Version 2011);

e) The test steps are modified (see Chapter 8; Chapter 6 of Version 2011);

f) The blank test is deleted (see Chapter 7 of Version 2011);

g) The determination of recovery rate, result expression, lower limit of detection and

precision are deleted (see Chapter 9, Chapter 10, Chapter 11 and Chapter 12 of

Version 2011);

h) The "Test Report" is added (see Chapter 10).

This document modifies and adopts ISO 16186.2021 Footwear - Critical Substances

Potentially Present in Footwear and Footwear Components - Determination of Dimethyl

Fumarate (DMFU).

In comparison with ISO 16186.2021, this document makes the following structural adjustments.

---5.1 is added, 5.2 ~ 5.7 correspond to 5.1 ~ 5.6 of ISO 16186.2021;

---6.1 is added, 6.2 ~ 6.11 correspond to 6.1 ~ 6.10 of ISO 16186.2021;

---Appendix A, Appendix B and Appendix C respectively correspond to Appendix C,

Appendix A and Appendix B of ISO 16186.2021.

The technical differences between this document and ISO 16186.2021, and the causes for the

differences are as follows.

---The target object-stock solution preparation method is modified (see 5.7.3 and 5.7.4),

and the dimethyl fumarate-working solution preparation method is added (see 5.7.5) to

increase the operability;

Footwear - Chemical Tests - Determination of Dimethyl

Fumarate (DMFu)

WARNING---the use of this document may involve hazardous materials, operations, and

equipment. This document does not address all safety or environmental issues associated

with its use. Before applying this document, it is the responsibility of the user of this

document to take appropriate measures to ensure the safety and health of personnel and

the environment and to determine the applicability of regulatory limitations.

1 Scope

This document describes the method for the determination of dimethyl fumarate (DMFu)

content by gas chromatography-mass spectrometry (GC-MS) or gas chromatography-tandem

mass spectrometry (GC-MS/MS).

This document is applicable to all types of footwear and footwear components except metal

components.

2 Normative References

The contents of the following documents constitute indispensable clauses of this document

through the normative references in the text. In terms of references with a specified date, only

versions with a specified date are applicable to this document. In terms of references without a

specified date, the latest version (including all the modifications) is applicable to this document.

GB/T 12810 Laboratory Glassware - Capacity Methods Testing and Use of Volumetric

Instruments (GB/T 12810-2021, ISO 4787.2010, NEQ)

3 Terms and Definitions

This document does not have terms and definitions that need to be defined.

4 Principle

In an ultrasonic water bath at 60 °C, use acetone (see solvent precautions in Appendix A) to

extract the sample. In this step, two different procedures can be used, depending on the material

being tested.

a) The "standard steps" without purification and concentration of the extract can be used

for samples with simple matrix effects, such as textiles, synthetic leather and artificial

leather;

7 Sampling

The specimen is a single material type (made of textiles, leather, polymers or other organic

materials) and is separately tested.

Cut the homogeneous material sample into pieces with a side length of 3 mm ~ 5 mm.

NOTE 1.considering the detection limit and quantification limit, a maximum of 3 specimens (of

equal mass) of the same type of material can be simultaneously tested.

NOTE 2.desiccant may be the source of DMFu contamination in shoes. Desiccant samples are

directly sampled and tested.

8 Test Steps