GB/T 38812.1-2020 PDF English
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GB/T 38812.1-2020: Direct reduced iron - Determination of iron (II) content - The potassium dichromate titrimetric method after decomposition of sample by ferric chloride
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GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 73.060.10 D 31 Direct reduced iron - Determination of iron (II) content - The potassium dichromate titrimetric method after decomposition of sample by ferric chloride ISSUED ON: JUNE 02, 2020 IMPLEMENTED ON: DECEMBER 01, 2020 Issued by: State Administration for Market Regulation; Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Principle ... 5 4 Reagents and materials ... 5 5 Instruments ... 6 6 Sampling and sample preparation ... 6 7 Analysis steps ... 6 8 Analysis result calculation and their expression ... 7 9 Test report ... 8 Appendix A (Normative) Sample analysis result acceptance procedure flow chart ... 10 Direct reduced iron - Determination of iron (II) content - The potassium dichromate titrimetric method after decomposition of sample by ferric chloride Caution -- The personnel who uses this Part shall have hands-on experience in formal laboratory work. This Part does not address all possible security issues. It is the responsibility of the user to take appropriate safety and health measures and to ensure compliance with the conditions which are set by the relevant national regulations.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 Weigh 0.4 g of sodium diphenylamine sulfonate and dissolve it in 100 mL of sodium carbonate solution (2 g/L).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 ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
