GB/T 21879-2015Water-soluble dyes - Determination of solubility - Drop test of filter papers (English PDF)

1 Scope

This standard specifies the point filter paper method for determining the solubility of water-soluble dyes.

This standard applies to the determination of the solubility of water-soluble dyes.

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.

GB/T 1914-2007 Chemical analysis filter paper

General conditions GB/T 2374-2007 Determination of dyes provisions

Laboratory use specifications and test methods GB/T 6682-2008 Analysis

3 Terms and Definitions

The following terms and definitions apply to this document.

5 Equipment and Materials

Equipment and materials shall comply with the relevant provisions of GB/T 2374-2007 in Chapter 4; test water should comply with GB/T 6682-2008

The three water requirements.

a) high glass beaker. Capacity 150mL;

b) constant temperature water bath;

c) mercury thermometers. 0 °C ~ 100 °C;

d) straight scale straw. Capacity 1mL;

e) filter paper. phi110mm speed qualitative filter paper, shall comply with the relevant provisions of GB/T 1914-2007 in;

f) temperature-controlled magnetic stirrer.