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GB/T 23273.4-2009 English PDF

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GB/T 23273.4-2009: Methods for chemical analysis of cobalt oxalate -- Part 4: Determination of silicon content -- Molybdenum blue spectrophotometry
Status: Valid

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
GB/T 23273.4-2009	English	139	Add to Cart	3 days [Need to translate]	Methods for chemical analysis of cobalt oxalate -- Part 4: Determination of silicon content -- Molybdenum blue spectrophotometry	Valid	GB/T 23273.4-2009

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Basic data

Standard ID	GB/T 23273.4-2009 (GB/T23273.4-2009)
Description (Translated English)	Methods for chemical analysis of cobalt oxalate -- Part 4: Determination of silicon content -- Molybdenum blue spectrophotometry
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	H13
Classification of International Standard	77.120.70
Word Count Estimation	6,684
Date of Issue	2009-01-15
Date of Implementation	2009-11-01
Regulation (derived from)	National Standard Approval Announcement 2009 No.2 (Total No.142)
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This standard specifies the determination of the amount of silicon in cobalt oxalate. This section applies to the determination of the amount of silicon in cobalt oxalate. Measuring range: 0. 001% to 0. 01 %.

GB/T 23273.4-2009: Methods for chemical analysis of cobalt oxalate -- Part 4: Determination of silicon content -- Molybdenum blue spectrophotometry

---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 cobalt oxalate Part 4. Determination of silicon content Molybdenum blue spectrophotometry ICS 77.120.70 H13 National Standards of People's Republic of China Methods for chemical analysis of cobalt oxalate Part 4. Determination of silicon content - Molybdenum blue spectrophotometric method Posted 2009-01-15 2009-11-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

GB/T 23273 "Methods for chemical analysis of cobalt oxalate" a total of eight sections. --- Part 1. Determination of cobalt content by potentiometric titration --- Part 2. Determination of lead content of electrothermal atomic absorption spectrometry --- Part 3. Determination of arsenic content by hydride generation - atomic fluorescence spectrometry --- Part 4. Determination of silicon content - Molybdenum blue spectrophotometric method --- Part 5. calcium, magnesium, sodium content - Flame Atomic Absorption Spectrometry --- Part 6. Determination of the amount of chloride ion selective electrode method --- Part 7. Determination of sulfate ion content of combustion - iodometric method --- Part 8. nickel, copper, iron, zinc, aluminum, manganese, lead, arsenic, calcium, magnesium, sodium content - Inductively coupled plasma atomic emission spectrometry This is Part 4. This part is proposed by the China Nonferrous Metals Industry Association. The non-ferrous metal part by the National Standardization Technical Committee. This section is responsible for drafting Jinchuan Group Limited. This section Zhuzhou Smelter Group Co., Ltd., Beijing Mining Research Institute participated in the drafting. The main drafters of this section. Zhang Zhi hair, dry Yong, Yang Xiuping, Dong Liping, Zhang Jihong, Lin Hsiu-ying, Zhang Yi, Gao Ying sword. Methods for chemical analysis of cobalt oxalate Part 4. Determination of silicon content - Molybdenum blue spectrophotometric method

1 Scope

GB/T 23273 provisions of this part of the determination of the amount of silicon in cobalt oxalate. This section applies to the determination of silicon content of cobalt oxalate. Measurement range. 0.001% to 0.01%.

2 Method summary

Sample with perchloric acid dissolved and evaporated to near dryness, wherein the insoluble silicon Hydrofluoric acid dissolution. When pH1.0 ~ pH1.5, silicon and molybdenum acid The molybdenum yellow ammonium heteropoly acid in sulfuric acid medium with butanol, the organic phase was washed with ammonium sulfate and stannous associated reduced to molybdenum blue, in a spectrophotometer Meter measuring the absorbance at a wavelength of 630nm.

3 Reagents

The reagents used in addition to special requirements, the rest are pure class distinctions, solution preparation and analysis are secondary distilled water, all reagent preparation after storage Stored in plastic bottles. 3.1 sulfate (ρ1.84g/mL). 3.2 perchloric acid (ρ1.67g/mL). 3.3 sulfate (1 + 3). 3.4 sulfuric acid (7 + 93). 3.5 hydrofluoric acid (1 + 1). 3.6 HCl (1 + 1). 3.7 saturated solution of boric acid. 3.8 ammonium molybdate solution (100g/L). Weigh 10g of high purity ammonium paramolybdate [(NH4) Mo7O24 · 4H2O] was dissolved in 80mL water, cooled, Diluted with water to 100mL, mix, use filtered. 3.9 citric acid solution (500g/L). 3.10 Hydrazine sulfate solution (2.5g/L), formulated with sulfuric acid (1.5 + 98.5). 3.11 stannous chloride (100g/L). Weigh 10g excellent pure stannous chloride dissolved in 100mL of hydrochloric acid (3.6), and mix using now. 3.12 ammonia, saturated Refining. 3.13 n-butanol, AR. 3.14 Silicon Storage standard solution. Weigh 0.2142g silica (silica mass fraction ≥99.9%) in a platinum crucible added 5g excellent pure anhydrous sodium carbonate, mix, cover, placed in a muffle furnace 400 ℃, the temperature was raised to 900 ℃, melting 1h, removed, washed with water crucible Outer crucible, placed in hot water containing 100mL of polytetrafluoroethylene cup, cold dissolution, removed, cooled to room temperature. Moved 1000mL volumetric flask Diluted with water to the mark, mix and immediately transferred to dry plastic bottles. This solution 1mL containing 100μg silicon. 3.15 Silicon standard solution. Pipette 50.00mL silicon standard stock solution (3.14) in 1000mL volumetric flask, dilute to the mark, mix Uniform, immediately moved into dry plastic bottles. This solution 1mL containing 5μg silicon.

4 Instrument

Spectrophotometer.

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