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Pig iron contenting nickel -- Determination of chromium content -- Ammonium per sulfate-ammonium ferrous sulfate titration method
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Basic data
| Standard ID | GB/T 32784-2016 (GB/T32784-2016) |
| Description (Translated English) | Pig iron contenting nickel -- Determination of chromium content -- Ammonium per sulfate-ammonium ferrous sulfate titration method |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | H11 |
| Classification of International Standard | 77.100 |
| Word Count Estimation | 6,698 |
| Date of Issue | 2016-06-14 |
| Date of Implementation | 2017-05-01 |
| Quoted Standard | GB/T 4010; GB/T 6682; GB/T 12805; GB/T 12806; GB/T 12808 |
| Regulation (derived from) | National Standard Announcement No. 8 of 2016 |
| 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 ammonium persulfate - ammonium ferrous sulfate titration method for determination of chromium content. This standard is applicable to the determination of chromium in nickel-containing pig iron, the determination range (mass fraction): 0.50% ~ 10.00%. |
GB/T 32784-2016: Pig iron contenting nickel -- Determination of chromium content -- Ammonium per sulfate-ammonium ferrous sulfate titration method
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Pig iron contenting nickel.Determination of chromium content.Ammonium per sulfate-ammonium ferrous sulfate titration method
ICS 77.100
H11
National Standards of People's Republic of China
Determination of chromium content in nickel - containing pig iron
Ammonium persulfate - ferrous ammonium sulfate titration
2016-06-14 release
2017-05-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Management Committee released
Foreword
This standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This standard is proposed by China Iron and Steel Industry Association.
This standard is under the jurisdiction of the National Technical Committee on Standardization of Pig Iron and Ferroalloys (SAC/TC318).
The drafting of this standard unit. Minmetals (Hunan) ferroalloy limited liability company, Metallurgical Industry Information Standards Institute.
The main drafters of this standard. Huang Yan, Yang Mao, Wang Hui, Peng Zaijiang, Xie Zhixin, Chen Zhibin.
Determination of chromium content in nickel - containing pig iron
Ammonium persulfate - ferrous ammonium sulfate titration
WARNING - Personnel using this standard should have practical experience in formal laboratory work. This standard does not indicate all possible security questions
question. It is the responsibility of the user to take appropriate safety and health measures and to ensure compliance with the conditions set forth in the relevant national regulations.
1 Scope
This standard specifies ammonium persulfate - ferrous ammonium sulfate titration determination of chromium content.
This standard is applicable to the determination of chromium content in nickel-containing pig iron, the determination range (mass fraction). 0.50% ~ 10.00%.
2 normative reference documents
The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article
Pieces. For undated references, the latest edition (including all modifications) applies to this document.
GB/T 4010 Ferroalloy chemical analysis of the sample to take and preparation
GB/T 6682 Analytical laboratory water specifications and test methods
GB/T 12805 Laboratory glass instrumentation burette
GB/T 12806 laboratory glass instrument single standard line capacity bottle
GB/T 12808 Laboratory glass instruments Single line suction pipette
3 principle
Samples dissolved in acid, sulfuric acid, phosphoric acid medium, silver nitrate as a catalyst, with ammonium persulfate oxidation of chromium into hexavalent, with ferrous sulfate
Ammonium standard titration solution titration, measured chromium content. For vanadium-containing samples, add excess ammonium ferrous sulfate standard titration solution, then potassium permanganate
Standard titration solution drops back.
4 reagent
Unless otherwise stated, only the analytical analytical reagents and secondary water in accordance with GB/T 6682 are used in the analysis.
4.1 nitric acid, ρ = 1.42 g/mL.
4.2 phosphoric acid, ρ = 1.69 g/mL.
4.3 hydrofluoric acid, ρ = 1.15 g/mL.
4.4 Hydrochloric acid, 1 1.
4.5 hydrochloric acid, 1 3.
4.6 sulfuric acid, 1 1.
4.7 Sulfuric acid, 5 95.
4.8 Sulfuric Acid-Phosphoric Acid Mixed Acid Solution. Take 1500 mL of water in a 3000 mL Erlenmeyer flask and slowly add.200 mL of phosphoric acid (4.2)
Stir evenly; water cooling, while stirring slowly add 800mL sulfuric acid (ρ = 1.84g/mL), stirring evenly.
4.9 silver nitrate solution, 10g/L. Weigh 1.0 g of silver nitrate in 100 mL of water and drop a few drops of nitric acid (4.1) in a brown bottle.
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