GB/T 38812.2-2020Direct reduced iron—Determination of metallic iron content—The potassium dichromate titrimetric method after decomposition of sample by ferric chloride (English PDF)
直接还原铁 金属铁含量的测定 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 38812.2-2020 is the English-translated version of 直接还原铁 金属铁含量的测定 三氯化铁分解重铬酸钾滴定法.
GB/T 38812.2-2020 is the Chinese standard "Direct reduced iron--Determination of metallic iron content--The potassium dichromate titrimetric method after decomposition of sample by ferric chloride".
Its scope clause reads: This Part of GB/T 38812 specifies the potassium dichromate titrimetric method after decomposition of sample by ferric chloride to determine the metallic iron content.
This Part applies to the determination of metallic iron content in direct reduced iron; the determination range (mass fraction): >= 50.00%. Its clauses include principle; reagents and materials; instruments; sampling and sample preparation; analysis steps; result calculation and expression; test report.
It was issued by the State Administration for Market Regulation on JUNE 02, 2020 and took effect on DECEMBER 01, 2020.
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Document preview — GB/T 38812.2-2020
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 Result calculation and expression7
- 9 Test report8
- Appendix A (Normative) Sample analysis result acceptance procedure flow chart9
1 Scope
This Part of GB/T 38812 specifies the potassium dichromate titrimetric method after decomposition of sample by ferric chloride to determine the metallic iron content.
This Part applies to the determination of metallic iron content in direct reduced iron; the determination range (mass fraction): >= 50.00%.
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
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 determinations
Make at least two independent determinations on the same sample.
Note: "Independent" means that the second and any subsequent determination result is not affected by the previous determination result. 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 determination on the same tested object in a short time, including the use of appropriate recalibration.
7.2 Sample mass
Weigh 0.10 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 4.4); stopper the bottle; place it on an oscillator and shake for 40 min. Use a medium-speed filter paper to filter; collect the filtrate in a 500 mL conical flask. Use water to wash the conical flask, stopper and residue 6 ~ 8 times; control the solution volume to 150 mL ~ 200 mL. […]
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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
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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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GB/T 38812.2-2020
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