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GB/T 23273.1-2009: Methods for chemical analysis of cobalt oxalate -- Part 1: Determination of cobalt content -- Potentiometric titration method
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| GB/T 23273.1-2009 | English | 139 |
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Methods for chemical analysis of cobalt oxalate -- Part 1: Determination of cobalt content -- Potentiometric titration method
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GB/T 23273.1-2009
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Basic data | Standard ID | GB/T 23273.1-2009 (GB/T23273.1-2009) | | Description (Translated English) | Methods for chemical analysis of cobalt oxalate -- Part 1: Determination of cobalt content -- Potentiometric titration method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H13 | | Classification of International Standard | 77.120.70 | | Word Count Estimation | 6,633 | | Date of Issue | 2009-01-05 | | 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 cobalt in cobalt oxalate. This section applies to the determination of the amount of cobalt oxalate cobalt. Measuring range: 30% to 33 %. | GB/T 23273.1-2009: Methods for chemical analysis of cobalt oxalate -- Part 1: Determination of cobalt content -- Potentiometric titration method
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Methods for chemical analysis of cobalt oxalate Part 1. Determination of cobalt content Potentiometric titration method
ICS 77.120.70
H13
National Standards of People's Republic of China
Methods for chemical analysis of cobalt oxalate
Part 1. Determination of cobalt content by potentiometric titration
Posted 2009-01-05
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 1.
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 in part by the Beijing General Research Institute of Mining and Metallurgy, Ganzhou cobalt tungsten Ltd. participated in the drafting.
The main drafters of this section. Zhang Zhi hair, dry Yong, Yu Shengjie, Qin Xia, Lvqing Cheng, Lin Hsiu-ying, in force, Tangshu Fang, Wan Jianhong, Li Neng Hua,
Xiu Xiang.
Methods for chemical analysis of cobalt oxalate
Part 1. Determination of cobalt content by potentiometric titration
1 Scope
GB/T 23273 provisions of this part of the determination of the amount of cobalt oxalate cobalt.
This section applies to the determination of cobalt content of cobalt oxalate. Measuring range. 30% to 33%.
2 Method summary
Sample decomposition with dilute nitric acid, ammonium citrate in the solution, the potassium ferricyanide solution of cobalt (Ⅱ) oxidation of cobalt (Ⅲ), the excess iron cyanide
Potentiometric titration method using potassium back titration with cobalt standard titration solution.
3 Reagents
Unless otherwise specified, the reagents were analytical reagent, which is a distilled water or equivalent purity water.
Nitrate 3.1 (ρ1.42g/mL).
3.2 nitric acid (1 + 1).
3.3 mixing ammonia ammonium citrate solution. Weigh 60g of ammonium chloride, 120g of ammonium citrate dissolved in 500mL water, add ammonia (ρ0.90g/mL)
To 1000mL, and mix.
3.4 cobalt standard titration solution. Accurately weigh 2.0000g metal cobalt (Co mass fraction ≥99.98%), was added 20mL of nitric acid (3.2),
Low heat until completely dissolved, oxides of nitrogen purge boiling, remove the cooling to room temperature, rinsed with water and dish table cup wall, moved 1000mL capacity
Bottle of water volume. 1mL solution containing 2mg cobalt.
3.5 ferricyanide standard solution (ρ [K3Fe (CN) 6] = 20g/L).
3.5.1 preparation. Weigh 20g of potassium ferricyanide, adding about 250mL dissolved in water, filtered and diluted with water to 1000mL, shake, stored in brown
Color bottle and set aside.
3.5.2 Calibration. Pipette 15.00mL Cobalt Standard Solution (3.4) (V0), in 150mL beaker, add 50mL ammonium citrate ammonia
Mixing solution (3.3), was added 15.00mL ferricyanide accurate standard solution (3.5.1) (Vp 2), in the automatic potentiometric titrator on (4.1), insert
The electrode (4.2), stirring, by the end of the potential of the instrument to set the end point of the titration recognition program or set, cobalt standard titration solution (3.4)
Titration to the end point potential (Vp 1).
According to equation (1) calculate the standard solution of potassium ferricyanide cobalt standard solution titration titration factor.
K = Vp Vp 1 Vp 2 0+
(1)
Where.
K --- titration factor ferricyanide standard solution volume consumed per unit volume of the number of standard titration solution of cobalt;
V0 --- Pipette cobalt standard solution volume in milliliters (mL of);
Vp 1 --- back titration volume cobalt standard solution consumed in milliliters (mL);
Vp 2 --- standard solution of potassium ferricyanide was added volume in milliliters (mL).
Taking an average of three calibration results. Titration volume 0.05mL poor within the scope of the mean value, or re-calibration.
4 Instrument
4.1 automatic potentiometric titrator, with a stirring device.
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