YS/T 226.12-2009 English PDF

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YS/T 226.12-2009: Methods for chemical analysis of selenium. Part 12: Determination of selenium content. Sodium thiosulphate titrimetric method

YS/T 226.12: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
YS/T 226.12-2009	209	Add to Cart	3 days	Methods for chemical analysis of selenium. Part 12: Determination of selenium content. Sodium thiosulphate titrimetric method
YS/T 226.12-1994	199	Add to Cart	2 days	Determination of lead content in selenium--Oscillopolarographic method	Obsolete

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GB/T 14849.3   GB/T 14849.1   GB/T 37385   YS/T 226.4   YS/T 226.2   YS/T 226.3   

Basic data

Standard ID: YS/T 226.12-2009 (YS/T226.12-2009)
Description (Translated English): Methods for chemical analysis of selenium. Part 12: Determination of selenium content. Sodium thiosulphate titrimetric method
Sector / Industry: Nonferrous Metallurgy Industry Standard (Recommended)
Classification of Chinese Standard: H17
Classification of International Standard: 77.120.99
Word Count Estimation: 6,655
Date of Issue: 2009-12-04
Date of Implementation: 2010-06-01
Older Standard (superseded by this standard): YS/T 226.15-1994
Regulation (derived from): MIIT [2009] No. 66
Issuing agency(ies): Ministry of Industry and Information Technology
Summary: This standard specifies the amount of selenium in selenium determination. This standard applies to the determination of selenium in selenium. Measuring range: from 98. 0% to 99. 0%.

YS/T 226.12-2009: Methods for chemical analysis of selenium. Part 12: Determination of selenium content. Sodium thiosulphate titrimetric method

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Methods for chemical analysis of selenium.Part 12. Determination of selenium content.Sodium thiosulphate titrimetric method ICS 77.120.99 H17 People's Republic of China Nonferrous Metals Industry Standard Replacing YS/T 226.15-1994 Chemical analysis of selenium Part 12. Determination of the amount of selenium Sodium thiosulfate volumetric method Posted 2009-12-04 2010-06-01 implementation Ministry of Industry and Information Technology of the People's Republic of China released

Foreword

YS/T 226 "selenium chemical analysis method" is divided into 13 parts. --- Part 1. Determination of bismuth content - Hydride Generation - Atomic Fluorescence Spectrometry --- Part 2. Determination of antimony content Hydride Generation - Atomic Fluorescence Spectrometry --- Part 3. Determination of aluminum content Chromazurol S- cetylpyridinium bromide spectrophotometric method --- Part 4. Determination of mercury content of dithizone - CTC colorimetric titration --- Part 5. Determination of the amount of silicon silicon molybdenum blue spectrophotometry --- Part 6. Determination of sulfur content symmetrical diphenyl semicarbazide spectrophotometry --- Part 7. Determination of magnesium content - Flame atomic absorption spectrometry --- Part 8. Determination of copper content - Flame atomic absorption spectrometry --- Part 9. Determination of iron content by flame atomic absorption spectrometry --- Part 10. Determination of nickel content by flame atomic absorption spectrometry --- Part 11. Determination of lead content by flame atomic absorption spectrometry --- Part 12. Determination of the amount of selenium sodium thiosulfate volumetric method --- Part 13. silver, aluminum, arsenic, boron, mercury, bismuth, copper, cadmium, iron, gallium, indium, magnesium, nickel, lead, silicon, antimony, tin, tellurium, titanium, zinc content of electricity Inductively coupled plasma mass spectrometry This section YS/T Part 12 226. The partial replacement of YS/T 226.15-1994 "determining the amount of selenium in selenium sodium thiosulfate volumetric method." And YS/T 226.15-1994 Compared to the main section has the following changes. --- Calibration standard solution of sodium thiosulfate to dichromate method. --- Cancel precipitation process, the direct titration with sodium thiosulfate standard solution. The non-ferrous metal part by the National Standardization Technical Committee and centralized. This section is responsible for drafting unit. Jinchuan Group Limited. Participated in the drafting of this section. Tongling Nonferrous Metals Group Holdings Co., Ltd., Beijing Nonferrous Metal Research Institute. The main drafters of this section. to Gan Yong, Zhang Zhi hair, Zhan Jianhua, Yang Xiuping, Lin Hsiu-ying, Liu peers, Liu Hong, Gao Yan. This part of the standard replaces the previous editions are. --- GB 2124-1980; --- YS/T 226.15-1994. Chemical analysis of selenium Part 12. Determination of the amount of selenium Sodium thiosulfate volumetric method

1 Scope

This section YS/T 226 specifies the method for determination of selenium in selenium content. This section applies to the determination of selenium in selenium content. Measurement range. 98.0% to 99.0%.

2 Method summary

Sample decomposition with a mixed acid, the sulfuric acid medium, sodium thiosulfate standard titration solution was titrated. Towards the end iodide Potassium iodide reaction precipitated starch as indicator to the standard titration with sodium thiosulfate solution titrated blue color disappears as the end point.

3 Reagents

Unless otherwise specified, in this section are secondary distilled water, reagents were pure class distinctions. 3.1 urea. 3.2 hydrochloride (ρ1.19g/mL). Nitrate 3.3 (ρ1.42g/mL). 3.4 sulfate (ρ1.84g/mL). 3.5 sulfate (1 + 1). 3.6 sulfate (5 + 1). 3.7 potassium iodide solution (50g/L). using now. 3.8 starch solution (5g/L). 3.9 Sodium hydroxide solution (200g/L). 3.10 phenolphthalein ethanol solution (10g/L). 3.11 sodium thiosulfate standard titration solution (0.1mol/L). 3.11.1 preparation. Weigh 26g sodium thiosulfate (Na2S2O3 · 5H2O), plus 0.2g of anhydrous sodium carbonate, dissolved in 1000mL of water, slow Slow boil 10min, remove the cooling. After filtration for two weeks. 3.11.2 Calibration. Weigh 0.1800g three dried at 120 ℃ to constant weight basis of potassium dichromate, placed iodometric flask, 25mL Dissolved in water, and 20mL sulfuric acid was added 2g of potassium iodide (3.6), shake; placed in dark place for 10min. Adding 150mL water, thiosulfate Sodium standard solution titration titration, was added 2mL starch solution (3.8) towards the end and continue titration until the solution turns from blue to light green. with When the blank test. The concentration of sodium thiosulfate standard titration solution according to equation (1). (1) Where. Ba --- sodium thiosulfate standard titration solution concentration, in units of moles per liter (mol/L); Vp 1 --- Volume sodium thiosulfate standard titration solution, in milliliters (mL); ......

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