YS/T 715.1-2009Methods for chemical analysis of selenium dioxide. Part 1: Determination of selenium dioxide content. Sodium thiosulfate titration (English PDF)

Foreword

YS/T 715 "selenium dioxide chemical analysis method" is divided into five parts.

--- Part 1. Determination of the amount of selenium dioxide, sodium thiosulfate titration;

--- Part 2. arsenic, cadmium, iron, mercury, lead content - Inductively coupled plasma atomic emission spectrometry;

--- Part 3. Determination of chlorine content of silver chloride turbidimetric method;

--- Part 4. residue on ignition - Gravimetric method;

--- Part 5. water-insoluble content - Gravimetric method.

This section YS/T Part 1 715.

The non-ferrous metal part by the National Standardization Technical Committee and centralized.

This section is responsible for drafting unit. Tongling Nonferrous Metals Group Holdings Limited.

Participated in the drafting of this section. Guangzhou Research Institute of Nonferrous Metals and Jiangxi Copper Corporation.

1 Scope

YS/T of the provisions of section 715 of the method for the determination of selenium dioxide Selenium dioxide content.

This section applies to the determination of selenium dioxide Selenium dioxide amount, measurement range. 96.00% - 99.50%.

2 Method summary

Sample was dissolved in water, in 3.6mol/L sulfuric acid medium, sodium thiosulfate standard titration solution titration, towards the end of potassium iodide, Precipitated iodine with starch as indicator, titration to the blue disappeared as the end point.

3 Reagents

Unless otherwise indicated in the analysis using only recognized as analytical grade reagents and distilled or deionized water or equivalent purity.

3.1 hydrochloride (rho1.19g/mL).

Nitrate 3.2 (rho1.42g/mL).

3.3 sulfate (rho1.84g/mL).

3.4 sulfate (1 + 1).

3.5 sulfate (1 + 4).

3.6 potassium iodide solution (50g/L).

3.7 starch solution (5g/L).

3.8 sodium thiosulfate standard titration solution [Ba (Na2S2O3 · 5H2O) = 0.1mol/L].