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Ferromolybdenum. Determination of silicon contents. Silicomolybdic blue spectrophotometric method
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Basic data
| Standard ID | SN/T 3113-2012 (SN/T3113-2012) |
| Description (Translated English) | Ferromolybdenum. Determination of silicon contents. Silicomolybdic blue spectrophotometric method |
| Sector / Industry | Commodity Inspection Standard (Recommended) |
| Classification of Chinese Standard | H11 |
| Classification of International Standard | 77.100 |
| Word Count Estimation | 6,638 |
| Quoted Standard | GB/T 4010; GB/T 6682 |
| Regulation (derived from) | National Quality Inspection (2012) 237; industry standard filing Notice 2012 No. 9 (Total No. 153); |
| Issuing agency(ies) | General Administration of Customs |
| Summary | This standard specifies the silicon molybdenum blue spectrophotometric determination of molybdenum in silicon content. This standard applies to molybdenum silicon content. Measuring range (mass fraction): 0. 016% to 2. 5%. |
SN/T 3113-2012: Ferromolybdenum. Determination of silicon contents. Silicomolybdic blue spectrophotometric method
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Ferromolybdenum.Determination of silicon contents.Silicomolybdic blue spectrophotometric method
People's Republic of China Entry-Exit Inspection and Quarantine Standards
Determination of silicon content in ferromolybdenum
Silicon molybdenum blue spectrophotometry
Issued on. 2012-05-07
2012-11-16 implementation
People's Republic of China
The State Administration of Quality Supervision, Inspection and Quarantine released
Foreword
This standard was drafted in accordance with GB/T 1.1-2009 given rules.
This standard is proposed and managed by the National Certification and Accreditation Administration Committee.
This standard was drafted. Shaanxi People's Republic of China Entry-Exit Inspection and Quarantine of Liaoning People's Republic of China
Board JINDUICHENG Molybdenum Company, Xi'an University of Science and Technology.
The main drafters. Zhang Lin, Cai Yan, Wang Chang Zhao, happy love mountains, Zhao Jian, Mouming Ren, Zhang Dongwen, Chen Xin.
Determination of silicon content in ferromolybdenum
Silicon molybdenum blue spectrophotometry
Warning. Use of this standard shall have a person experiences regular laboratory work. This standard does not point out all possible security issues.
Users have the responsibility to take appropriate safety and health practices and to ensure compliance with the conditions relevant national regulations.
1 Scope
This standard specifies the silicon molybdenum blue spectrophotometric determination of silicon content in ferromolybdenum.
This standard applies to the determination of silicon content in ferromolybdenum. Measurement range (mass fraction). 0.016% to 2.5%.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 4010 alloy chemical analysis and preparation of samples
Laboratory use specifications and test methods GB/T 6682 Analysis
3 Method summary
The sample was dissolved by nitric acid in acidic medium, add ammonium molybdate and silicon molybdenum yellow silicon formed in the presence of oxalic acid, ferrous ammonium sulfate is reduced to
Silicon molybdenum blue. 660nm wavelength spectrophotometer measured absorbance.
4 Reagents
Unless otherwise indicated, analytical reagent used in the analysis only and in accordance with GB/T 6682 specified secondary water.
4.1 high-purity iron powder (silicon content less than 0.005%).
4.2 nitric acid (13).
4.3 solution of ammonium persulfate (150g/L), the use of the existing service.
4.4 ammonium molybdate solution (50g/L). Weigh 5g of ammonium molybdate [(NH4) 6MO7O24 · 4H2O] was dissolved in 80mL water, cooled, washed with water
Diluted to 100mL, mix, use filtered.
4.5 oxalic acid solution (50g/L).
4.6 ferrous ammonium sulfate solution (60g/L). Weigh 6g ferrous ammonium sulfate [(NH4) 2Fe (SO4) 2 · 6H2O], add 6 drops of sulfuric acid (11)
It was dissolved in 100mL of water.
4.7 silicon standard stock solution (200μg/mL). Weigh 0.2140g silica [silica (mass fraction) ≥99.9%] (in advance
1050 ℃ burning 30min, cooled in a desiccator to room temperature), placed in a platinum crucible, add 5g excellent pure anhydrous sodium carbonate, mix, cover,
Placed 400 ℃ muffle furnace, heated to 900 ℃, melting 1h, removed, cooled, 100mL Teflon beaker in hot water
Take, washed with water and the lid of the crucible, cooled to room temperature. Transferred to 500mL volumetric flask, dilute to the mark, shake, and immediately transferred to dry plastic
Feeding bottle save.
4.8 Silicon standard solution (50μg/mL). Pipette 25mL silicon standard stock solution (4.7) in 100mL flask, diluted with water to the mark,
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