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YS/T 226.4-2009 English PDF

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YS/T 226.4-2009: Methods for chemical analysis of selenium. Part 4: Determination of mercury content. Dithizone-carbon tetrachloride titrated colorimetric-method
Status: Valid

YS/T 226.4: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
YS/T 226.4-2009English169 Add to Cart 3 days [Need to translate] Methods for chemical analysis of selenium. Part 4: Determination of mercury content. Dithizone-carbon tetrachloride titrated colorimetric-method Valid YS/T 226.4-2009
YS/T 226.4-1994English199 Add to Cart 2 days [Need to translate] Determination of aluminum content in selenium--Chrome azurol S--Cetyl trimethyl ammonium bromide absorption photometric method Obsolete YS/T 226.4-1994

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Standard similar to YS/T 226.4-2009

GB/T 14849.3   GB/T 14849.1   GB/T 37385   YS/T 226.3   YS/T 226.5   YS/T 226.2   

Basic data

Standard ID YS/T 226.4-2009 (YS/T226.4-2009)
Description (Translated English) Methods for chemical analysis of selenium. Part 4: Determination of mercury content. Dithizone-carbon tetrachloride titrated colorimetric-method
Sector / Industry Nonferrous Metallurgy Industry Standard (Recommended)
Classification of Chinese Standard H17
Classification of International Standard 77.120.99
Word Count Estimation 6,642
Date of Issue 2009-12-04
Date of Implementation 2010-06-01
Older Standard (superseded by this standard) YS/T 226.5-1994
Regulation (derived from) MIIT [2009] No. 66
Issuing agency(ies) Ministry of Industry and Information Technology
Summary This standard specifies the amount of mercury in selenium determination. This standard applies to the determination of the amount of mercury selenide. Measuring range: 0. 0005% to 0. 04%

YS/T 226.4-2009: Methods for chemical analysis of selenium. Part 4: Determination of mercury content. Dithizone-carbon tetrachloride titrated colorimetric-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 4. Determination of mercury content.Dithizone-carbon tetrachloride titrated colorimetric-method ICS 77.120.99 H17 People's Republic of China Nonferrous Metals Industry Standard Replacing YS/T 226.5-1994 Chemical analysis of selenium Part 4. Determination of the amount of mercury Dithizone - CTC colorimetric titration 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 4 226. The partial replacement of YS/T 226.5-1994 "Determination of the amount of mercury and selenium dithizone - CTC titration colorimetry." And YS/T 226.5- Compared to 1994, this section has the following main changes. --- Text format has been modified; --- Supplementary terms of quality assurance and control; --- Increase the repeatability limit, will be allowed to poor reproducibility limit. The non-ferrous metal part by the National Standardization Technical Committee and centralized. This section is responsible for drafting unit. Jinchuan Group Limited. This section is drafted. Beijing Nonferrous Metal Research Institute. Participated in the drafting of this section. Jinchuan Group Co., Ltd., Guangzhou Nonferrous Metal Research Institute. The main drafters of this section. Liu Ying, Liu Hong, Gao Yan, Dong Liping, Zhu Yujiang, Dai Fengying, Sun Hongying. This part of the standard replaces the previous editions are. --- GB 2114-1980; --- YS/T 226.5-1994. Chemical analysis of selenium Part 4. Determination of the amount of mercury Dithizone - CTC colorimetric titration

1 Scope

This section YS/T 226 specifies the method for determination of selenium in the amount of mercury. This section applies to the determination of the amount of mercury and selenium. Measurement range. 0.0005% to 0.04%.

2 Method summary

The sample is dissolved in nitric acid, mercury with dithizone in pH4 ~ pH5 acid medium - carbon tetrachloride generated orange-red complex, take into Titrated colorimetric assay. There edetate sodium in the presence of selenium impurity element other than silver outer not interfere with the determination. Interference silver, plus ammonium thiocyanate masking.

3 Reagents

The standard water is deionized water, conductivity is not more than 6.67 × 10-2μS · cm -1. Nitrate 3.1 (ρ1.42g/mL). 3.2 nitric acid (1 + 1). 3.3 Disodium ethylenediaminetetraacetate solution (50g/L). 3.4 ammonium acetate solution (500g/L). Ammonia 3.5 (1 + 1). 3.6 ammonium thiocyanate solution (500g/L). 3.7 pairs Diphenylthiocarbazone. Take 1g of finely dithizone dissolved in 200mL of carbon tetrachloride was added 200mL ammonium hydroxide (1 + 100) in the dispensing Funnel thoroughly shaken. After standing stratification, carbon tetrachloride layer was charged to another separating funnel, plus ammonium hydroxide (1 + 100) (the volume can be adapted When reduction), repeat the operation until the last ammonium hydroxide was colorless. All ammonium hydroxide solutions were combined, washed with hydrochloric acid (1 + 1) Dropwise to precipitate all dithizone solution colorless. Precipitated dithizone filtered with a glass funnel, washed with water 2 to 3 times, left at 40 ℃ Right drying. 3.8 pairs Diphenylthiocarbazone - carbon tetrachloride solution (0.01g/L). 3.9 mercury standard solution 3.9.1 Mercury standard solution A. Weigh 0.1354g mercuric chloride dissolved in water and transferred to 1000mL volumetric flask, dilute to the mark with water, shake uniform. This solution 1mL containing 100μg mercury. 3.9.2 Mercury standard solution B. Pipette 50.00mL solution A, placed in 500mL flask, diluted with water to the mark. This solution 1mL containing 10μg mercury. 3.10 pairs Diphenylthiocarbazone - CTC calibration solution. Pipette 10.00mL mercury standard solution (3.9.2) (Vp), placed in 60mL separatory funnel, Diluted with water to 20mL, plus 5mL disodium edetate solution (3.3), shake the solution was adjusted with ammonia (3.5) and ammonium acetate (3.4) pH4 ~ pH5, add 1mL of ammonium thiocyanate solution (3.6), 10mL ammonium acetate solution (3.4), shake, dropping dithizone - carbon tetrachloride solution Extraction, start adding 5mL, 3mL, 2mL, 1mL, close to the end dropwise 0.50mL, 0.20mL. Each oscillation 1min, standing After separation, discard the orange-red organic phase was extracted into the organic phase was dark green date (such as last dithizone - carbon tetrachloride and excess solution was dark green When mixing colors can be generated dithizone - CTC volume of 1/2,1/3 is calculated). Write down the consumption of dithizone - carbon tetrachloride solution

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