GB/T 2382-2015Sulphur dyes - Determination of content of free sulphur (English PDF)

1 Scope

This standard specifies the method for the determination of free sulfur content of sulfur.

This standard applies to the determination of free sulfur content of sulfur.

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 chemical reagent standard titration solution

GB/T 603 chemical reagent in test methods - Preparations with

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

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

3 Principle of Measurement

Extraction with an organic solvent free from sulfur in the sulfur dye, and then the organic solvent was distilled off, the residue was then reacted with sodium sulfite, with

Iodine titration standard solution titration. Standard iodine titration solution free sulfur content is calculated according to consumption.

S Na2SO3 -> Na2S2O3

2Na2S2O3 I2 -> 2NaI Na2S4O6

4 Determination

Warning --- volatile organic solvent used in this standard is harmful to human health and the Flammable vapor can form explosive mixtures with air,

It should be performed in a fume hood, and prevent contact with open flame.