GB/T 29493.8-2013Determination of harmful substances in textile dyeing and finishing auxiliaries - Part 8: Determination of residual monomers in polyacrylate (English PDF)

1 Scope

GB/T 29493 provisions of this part of the measurement method of textile dyeing and finishing auxiliaries polyacrylate product residual monomers.

This section applies to the determination of the residual monomer content of the polyacrylate coating finishing agents, adhesives and other products.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein

Member. For undated references, the latest edition (including any amendments) applies to this document.

Preparation of GB/T 601-2002 Chemical Reagent standard titration solution

GB/T 603-2002 Chemical Reagent Test Methods - Preparations with

GB/T 6682-2008 analytical laboratory use specifications and test methods (ISO 3696. 1987, MOD)

GB/T 8170-2008 revised value represents about rules and limit values and judgment

Principle 3

An excess of potassium bromate in the sample solution - a solution of potassium bromide, potassium bromide and potassium bromate reaction of bromine in acidic medium with the sample

Double bond reaction was. After completion of the reaction, an excess of potassium iodide and reduction of unreacted bromine iodine generated, and finally with sodium thiosulfate

Precipitation titration standard solution of iodine.

KBrO3 5KBr 6HCl ->

3Br2 6KCl 3H2O

CH -2 CHCOOR Br2 ->

CH2BrCHBrCOOR

Br2 2KI ->

2KBr I2

I2 2Na2S2O3 ->

Na2S4O6 2NaI

4 Reagents and solutions

Unless otherwise specified, use only recognized as analytical reagents and GB/T 6682-2008 specified in the third grade water.