GB/T 38812.1-2020Direct reduced iron—Determination of iron(II) content—The potassium dichromate titrimetric method after decomposition of sample by ferric chloride (English PDF)
直接还原铁 亚铁含量的测定 三氯化铁分解重铬酸钾滴定法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
June 2, 2020
Implementation date
January 1, 2021
Scope
GB/T 38812.1-2020 is the English-translated version of 直接还原铁 亚铁含量的测定 三氯化铁分解重铬酸钾滴定法.
GB/T 38812.1-2020 is the part of the Chinese series on direct reduced iron that determines the iron(II) content by potassium dichromate titrimetry after decomposing the sample with ferric chloride.
It gives the principle, the reagents, the instruments, the sampling and sample preparation, the analytical procedure, the calculation of the result and the test report.
It applies to the determination of iron(II) in direct reduced iron. Steel producers, DRI plants and test laboratories use it. Issued on 2 June 2020, it has applied since 1 January 2021.
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Document preview — GB/T 38812.1-2020
National Standard of the People's Republic of China
- ICS
- 73.060.10
- Classification
- D 31
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope4
- 2 Normative references4
- 3 Principle5
- 4 Reagents and materials5
- 5 Instruments6
- 6 Sampling and sample preparation6
- 7 Analysis steps6
- 8 Analysis result calculation and their expression7
- 9 Test report8
- Appendix A (Normative) Sample analysis result acceptance procedure flow chart10
1 Scope
This Part of GB/T 38812 specifies the potassium dichromate titrimetric method after decomposition of sample by ferric chloride to determine the iron (II) content.
This Part applies to the determination of iron (II) content in direct reduced iron; the determination range (mass fraction): 1.00% ~ 40.00%.
2 Normative references
The following documents are indispensable for the application of this document.
For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 6682, Water for analytical laboratory use - Specification and test methods
GB/T 8170, Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 12805, Laboratory glassware - Burettes
GB/T 12806, Laboratory glassware - One-mark volumetric flasks
GB/T 12808, Laboratory glassware - One mark pipettes
GB/T 24239, Direct reduced iron and hot briquetted iron - Sampling and sample preparation […]
5 Instruments
5.1 Common laboratory equipment that is used in the analysis. Burettes, one-mark volumetric flasks and one mark pipettes shall meet the requirements of GB/T 12805, GB/T 12806 and GB/T 12808.
5.2 Oscillator: reciprocating multi-functional oscillator. Oscillation frequency:
150 times/min ~ 160 times/min; amplitude: 20 mm (reciprocating).
6 Sampling and sample preparation
Perform sampling and sample preparation according to the provisions of GB/T 24239.
7 Analysis steps
7.1 Number of measurements
Make at least two independent measurements on the same sample.
Note: "Independent" means that the second and subsequent measurement results are not affected by the previous measurement results. In this analysis method, this condition means that in the same laboratory, the same operator uses the same equipment and the same test method to independently repeat the measurement on the same tested object in a short time, including the use of appropriate recalibration.
7.2 Sample mass
Weigh 0.20 g of sample, to the nearest 0.000 1 g.
7.3 Blank test
Carry out a blank test along with the sample.
7.4 Determination
7.4.1 Sample decomposition
Place the sample (see 7.2) in a dry 300 mL conical flask; add 40 mL of ferric trichloride solution (see 4.7); stopper the bottle; place it on an oscillator and shake for 40 min. Use medium-speed filter paper to filter; use water to wash the […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 6682Water for analytical laboratory use - Specification and test methods
- GB/T 8170Rules of rounding off for numerical values & expression and judgement of limiting values
- GB/T 12805Laboratory glassware -- Burettes
- GB/T 12806Laboratory glassware -- One-mark volumetric flasks
- GB/T 12808Laboratory glassware - One mark pipettes
- GB/T 24239Direct reduced iron and hot briquetted iron -- Sampling and sample preparation
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Related Standards
GB/T 12805-2011 — Laboratory glassware -- Burettes
GB/T 12806-2011 — Laboratory glassware -- One-mark volumetric flasks
GB/T 12808-2015 — Laboratory glassware - One mark pipettes
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