GB/T 5124.3-2017 English PDF

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GB/T 5124.3-2017: Hard metals -- Part 3: Determination of cobalt -- Potentiometric method
Status: Valid

GB/T 5124.3: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 5124.3-2017	119	Add to Cart	3 days	Hard metals -- Part 3: Determination of cobalt -- Potentiometric method	Valid
GB/T 5124.3-1985	159	Add to Cart	2 days	Methods for chemical analysis of hardmetals. The potentiometric method for the determination of cobalt content	Obsolete

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Basic data

Standard ID: GB/T 5124.3-2017 (GB/T5124.3-2017)
Description (Translated English): Hard metals -- Part 3: Determination of cobalt -- Potentiometric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H16
Classification of International Standard: 77.160
Word Count Estimation: 6,683
Date of Issue: 2017-10-14
Date of Implementation: 2018-05-01
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

GB/T 5124.3-2017: Hard metals -- Part 3: Determination of cobalt -- Potentiometric 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.
Hardmetals - Part 3. Determination of cobalt - Potentiometric method ICS 77.160 H16 National Standards of People's Republic of China Replacing GB/T 5124.3-1985 Carbide chemical analysis methods Part 3. Determination of cobalt content potentiometric titration (ISO 3909.1976, Hardmetals-Determinationofcobalt- Potentiometricmethod, IDT) 2017-10-14 Published 2018-05-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China China National Standardization Administration released

Foreword

GB/T 5124 "Carbide chemical analysis method" is divided into four parts. --- Part 1. Determination of total carbon content Gravimetric method; --- Part 2. Determination of insoluble (free) carbon content Gravimetric method; --- Part 3. Determination of cobalt content potentiometric titration; --- Part 4. Determination of titanium content hydrogen peroxide spectrophotometry. This section GB/T 5124 Part 3. This section drafted in accordance with GB/T 1.1-2009 given rules. This section instead of GB/T 5124.3-1985 "Carbide chemical analysis potentiometric titration of cobalt," and GB/T 5124.3- The main changes compared to 1985 are as follows. --- "4.3 calomel electrode or tungsten electrode" to "6.3 tungsten electrode or other reference electrode"; --- Replace the "Calculation of 7 Analysis Results" with "Expression of 9 Analysis Results" and add "The calculation result is accurate to 0.01%"; --- "8 allowable difference" to "9.3 allowable difference", and added "9.4 The final result to pass the arithmetic mean of the measured value of Report the results, accurate to 0.1%. " This section uses the translation method identical with ISO 3909.1976 "Determination of cobalt carbide potentiometry titration." This part is proposed by China Nonferrous Metal Industry Association. This part of the National Non-ferrous Metal Standardization Technical Committee (SAC/TC243) centralized. This section is responsible for the drafting unit. Zhuzhou Cemented Carbide Group Co., Ltd., Shenzhen Note into Technology Co., Ltd., non-ferrous metal technology Economic Research Institute. The main drafters of this section. Wang Hui-ping, Zhang Ying, Guo Liping, Zhao Shengzhi, Zhao Guoming, Mo Zixuan. This part replaces the standards previously issued as. --- GB/T 5124.3-1985. Carbide chemical analysis methods Part 3. Determination of cobalt content potentiometric titration

1 Scope

GB/T 5124 provisions of this part of the potential titration Determination of cobalt carbide.

2 scope of application

GB/T 5124 This section applies to carbide and bonded metal powder (no lubricant) and various grades of pre-sintering or sintering Determination of cobalt content in cemented carbide. Measurement range. 1% (mass fraction) or more.

3 method principle

In strong ammonia medium with an excess of potassium ferricyanide (III) cobalt is oxidized to trivalent. Titration with cobalt sulfate solution potentiometric titration excess Potassium ferricyanide.

4 interference element

The effects of interfering elements such as vanadium and manganese should be considered. Vanadium and manganese are also oxidized by potassium ferricyanide (III). Vanadium participates in the reaction quantitatively Content less than 0.5% (mass fraction) can be corrected. If the total amount of tantalum and niobium in the sample is less than 0.02% (mass fraction), then the amount of manganese can be as high as 0.2% (mass fraction) quantitative reaction. If tantalum niobium This method is valid only when the total amount exceeds 0.02% (mass fraction) and the amount of manganese is less than 0.03% (mass fraction).

5 reagent

Only analytical reagents identified as analytical grade and distilled or corresponding pure water are used in the analysis. 5.1 Ammonium sulfate. 5.2 Hydrochloric acid, p = 1.19 g/mL. 5.3 Hydrofluoric acid, ρ = 1.12 g/mL. 5.4 Nitric acid, p = 1.42 g/mL. 5.5 Sulfuric acid, p = 1.84 g/mL. 5.6 Ammonia, p = 0.91 g/mL. 5.7 Ammonium citrate solution Dissolve 100g of citric acid in 900mL of water and add 100mL of aqueous ammonia (5.6). 5.8 cobalt sulfate standard solution, 1L containing 3g cobalt. Cobalt standard solution with dense metal cobalt can also be formulated with ammonium or ammonium sulfate. When necessary, its concentration can be 1 - nitroso - 2-naphthol gravimetric or electrolytic calibration. 5.9 Potassium ferricyanide (Ⅲ) standard titration solution, 1L is equivalent to about 3g cobalt. 17 g of K3 [Fe (CN) 6] was dissolved in 1 L of water and mixed. The following method was used to determine cobalt sulfate standard solution (5.8) and ferricyanide ......

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