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YS/T 710.5-2009Method for chemical analysis of cobalt oxide. Part 5: Determination of silicon content. Molybdenum blue spectrophotometry (English PDF)

氧化钴化学分析方法第5部分：硅量的测定钼蓝分光光度法

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Issued by

Ministry of Industry and Information Technology

Level / Type

National · Recommended

Issue date

December 4, 2009

Implementation date

June 1, 2010

Scope

YS/T 710.5-2009 is the English-translated version of 氧化钴化学分析方法第5部分：硅量的测定钼蓝分光光度法.

YS/T 710.5-2009 — YS/T of the provisions of section 710 of the method for the determination of the amount of cobalt oxide silicon. This section applies to the determination of the amount of silicon oxide cobalt. Measurement range. 0.0010% to 0.050%.

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Document preview — YS/T 710.5-2009

National Standard of the People's Republic of China

ICS: 77.120.70
Classification: H 13
Replacing: YS/T 256-2000

Issued by: Ministry of Industry and Information Technology

Foreword
1 Scope
2 Method summary
3 Reagents
3.1 Commercially available reagents
3.2 Solution
3.3 Standard solution
4 Instrument

Foreword

YS/T 710 "cobalt oxide chemical analysis method" is divided into six sections.

--- Part 1. Determination of cobalt content potentiometric titration;

--- Part 2. Determination of sodium content by flame atomic absorption spectrometry;

--- Part 3. Determination of the amount of sulfur by high frequency combustion infrared absorption method;

--- Part 4. Determination of arsenic content by atomic fluorescence spectrometry;

--- Part 5. Determination of silicon content - Molybdenum blue spectrophotometric method;

--- Part 6. calcium, cadmium, copper, iron, magnesium, manganese, nickel, lead and zinc content - Inductively coupled plasma atomic emission spectrometry.

This section YS/T Part 5 710.

The partial replacement of YS/T 256-2000 "cobalt oxide" Appendix F. Compared with YS/T 256-2000 "cobalt oxide" Appendix F, Part the main changes are as follows.

--- Molybdenum blue spectrophotometric method instead of the emission spectrometry;

--- Complements the precision and quality assurance and control provisions.

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

This section is responsible for drafting unit. Zhuzhou Smelter Group Co., Ltd.

Participated in the drafting of this section. Jinchuan Group Ltd., Ganzhou cobalt tungsten limited liability company.

1 Scope

YS/T of the provisions of section 710 of the method for the determination of the amount of cobalt oxide silicon.

This section applies to the determination of the amount of silicon oxide cobalt. Measurement range. 0.0010% to 0.050%.

2 Method summary

Sample with perchloric acid dissolved and evaporated to near dryness, wherein the insoluble silica, hydrofluoric acid is added to dissolve. At pH1.5, the silicon and ammonium molybdate the molybdenum yellow heteropoly acid in sulfuric acid medium with butanol, the organic phase with sulfuric acid diamide and stannous reduced to molybdenum blue, for spectrophotometric Total 630nm wavelength measured absorbance.

3 Reagents

Solution preparation and analysis of water are ultra pure water. After reagent preparation were stored in plastic bottles.

3.1 Commercially available reagents

3.1.1 hydrofluoric acid, pure class distinctions.

3.1.2 butanol.

3.2 Solution

3.2.1 perchloric acid (1 + 1), pure class distinctions.

3.2.2 sulfuric acid (1 + 3), ultrapure.

3.2.3 sulfuric acid (7 + 93), ultra-pure.

3.2.4 a saturated solution of boric acid, high purity.

3.2.5 ammonium molybdate solution (100g/L). Weigh 10g of ammonium molybdate (excellent pure) was dissolved in 80mL water, cooled, diluted with water to 100mL, mix and filter use.

3.2.6 citric acid solution (500g/L), pure class distinctions.

3.2.7 Hydrazine sulfate solution (2.5g/L). excellent pure, formulated with high purity sulfuric acid (1.5 + 98.5).

3.2.8 stannous chloride (100g/L). Weigh 10g of stannous chloride dissolved in high purity hydrochloric acid (1 + 1) and diluted to 100mL, mix, effective Five days.

3.2.9 ammonia, high purity.

3.3 Standard solution

3.3.1 silicon standard stock solution. Weigh 0.2142g silica (SiO2>=99.9%) in a platinum crucible, 5g of anhydrous sodium carbonate (Excellent pure), mix, cover, placed in a muffle furnace 400 °C, the temperature was raised to 900 °C, melting 1h, washed with water and remove the outer wall of the crucible, placed in polytetrafluoroethylene Fluoride beaker, add 100mL cold water to dissolve, cooled to room temperature. Moved into 1000mL volumetric flask, dilute to the mark, mix, Immediately transferred to dry plastic bottles. This solution 1mL containing 100µg silicon.

3.3.2 Silicon standard solution. Pipette 50.00mL silicon standard stock solution (3.3.1) in 1000mL volumetric flask, dilute to the mark, Mix dried immediately transferred to a plastic bottle. This solution 1mL containing 5µg silicon.

4 Instrument

Spectrophotometer.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 4 pages — is available in the English PDF.

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