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GB/T 4333.6-2019: Ferrosilicon - Determination of chromium content - Diphenylcarbazide spectrophotometric method
Status: Valid GB/T 4333.6: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 4333.6-2019 | English | 199 |
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Ferrosilicon - Determination of chromium content - Diphenylcarbazide spectrophotometric method
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GB/T 4333.6-2019
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| GB/T 4333.6-1988 | English | 159 |
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Methods for chemical analysis of ferrosilicon. The diphenylcarbazide photometric method for the determination of chromium content
| Obsolete |
GB/T 4333.6-1988
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| GB/T 4333.6-1984 | English | RFQ |
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Methods for chemical analysis of ferrosilicon--The diphenylcarbazide photometric method for the determination of chromium content
| Obsolete |
GB/T 4333.6-1984
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PDF similar to GB/T 4333.6-2019
Basic data | Standard ID | GB/T 4333.6-2019 (GB/T4333.6-2019) | | Description (Translated English) | Ferrosilicon - Determination of chromium content - Diphenylcarbazide spectrophotometric method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H11 | | Classification of International Standard | 77.100 | | Word Count Estimation | 10,183 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2020-05-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 4333.6-2019: Ferrosilicon - Determination of chromium content - Diphenylcarbazide spectrophotometric method
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Ferrosilicon--Determination of chromium content--Diphenylcarbazide spectrophotometric method
ICS 77.100
H11
National Standards of People's Republic of China
Replace GB/T 4333.6-1988
Determination of chromium content in ferrosilicon
Diphenylcarbazide spectrophotometry
Published on.2019-06-04
2020-05-01 implementation
State market supervision and administration
China National Standardization Administration issued
Foreword
The analysis method of GB/T 4333 ferrosilicon is divided into 9 parts.
--- GB/T 4333.1 Determination of silicon iron content - Perchloric acid dehydration weight method and potassium fluorosilicate capacity method;
---GB/T 4333.2 Ferrosilicon chemical analysis method 铋phosphorus molybdenum blue method for the determination of phosphorus;
--- GB/T 4333.3 Ferrosilicon chemical analysis method potassium periodate spectrophotometric determination of manganese content;
--- GB/T 4333.4 Determination of ferrosilicon content - chrome azurol S spectrophotometry, EDTA titration and flame atomic absorption
Spectroscopy
--- GB/T 4333.5 Determination of ferrosilicon, manganese, aluminium, calcium, chromium and iron content - Dispersion X-ray fluorescence spectroscopy
Glass film method);
--- GB/T 4333.6 Determination of chromium content of ferrosilicon - Diphenylcarbonyl hydrazide spectrophotometric method;
--- GB/T 4333.7 Determination of sulfur content of ferrosilicon - Infrared absorption method and chromatographic separation of barium sulfate gravimetric method;
--- GB/T 4333.8 ferrosilicon chemical analysis method for the determination of calcium by atomic absorption spectrometry;
---GB/T 4333.10 Determination of carbon content of ferrosilicon Infrared absorption method.
This part is the sixth part of GB/T 4333.
This part is drafted in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB/T 4333.6-1988 "Chemical analysis method of ferrosilicon by diphenylcarbazide photometric method for the determination of chromium content". This section
Compared with GB/T 4333.6-1988, the main technical changes are as follows.
--- Revised the range, the measurement range (mass fraction) is adjusted from 0.100% to 0.600% to 0.010% to 0.600% (see Chapter 1,
Chapter 1 of the 1988 edition);
--- Added normative references (see Chapter 2);
--- Modified the solution to be added to the diphenylcarbazide ethanol solution is anhydrous ethanol (see 4.9, 3.9 edition of 1988);
--- Increased sampling and sample preparation (see Chapter 6);
--- Increased the number of measurements (see 7.2);
--- Modified the analysis steps, such as "smoke perchloric acid for about 3min" to "continue to heat up the evaporation of perchloric acid to the solution about 4mL left
Right"; "to fully oxidize the chromium and completely dissolve the ammonium persulfate" was changed to "the solution appeared stable red and then kept the solution slightly boiling
5min, sufficient oxidation of chromium and complete decomposition of ammonium persulfate" (see 7.5, 5.3 edition of 1988);
--- Modified the content of the allowable difference, replacing the "permitted difference" with the repetitive limit r and the reproducibility limit R obtained by statistics (see Chapter 9,
Chapter 7 of the 1988 edition);
--- Added the content of the test report (see Chapter 10).
This part was proposed by the China Iron and Steel Association.
This part is under the jurisdiction of the National Iron and Iron Alloy Standardization Technical Committee (SAC/TC318).
This section drafted by. Wuhan Iron and Steel Group Kunming Iron and Steel Co., Ltd., Erdos City West Gold Mining and Metallurgy Co., Ltd., Bengang Steel Plate
Co., Ltd., Metallurgical Industry Information Standards Institute.
The main drafters of this section. Tao Jun, Zhao Yu, Xu Yaping, Sun Xiaoyuan, Qi Yuesi, Ma Ning, Wang Wenfeng, Zeng Haimei, Yan Lizhi, Zhang Kun, Chen Gang,
Min Min, Lu Fen, Lu Chunsheng.
The previous versions of the standards replaced by this section are.
---GB/T 4333.6-1984, GB/T 4333.6-1988.
Determination of chromium content in ferrosilicon
Diphenylcarbazide spectrophotometry
Caution - Personnel using this section should have formal laboratory practice experience. This section does not address all possible security questions.
The user is responsible for taking appropriate safety and health measures and ensuring compliance with the relevant national regulations.
1 Scope
This part of GB/T 4333 specifies the determination of chromium in ferrosilicon by diphenylcarbazide spectrophotometry.
This section applies to the determination of chromium content in ferrosilicon. Measuring range (mass fraction). 0.010%~0.600%.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
Preparation and preparation of GB/T 4010 ferroalloy chemical analysis sample
GB/T 6379.1 Accuracy of measurement methods and results (accuracy and precision) Part 1. General and definition
GB/T 6379.2 Accuracy of measurement methods and results (accuracy and precision) Part 2. Determination of standard method of measurement
Basic method of sex and reproducibility
GB/T 6682 Analytical laboratory water specifications and test methods
GB/T 7729 Metallurgical products - Chemical analysis - General rules for spectrophotometry
GB/T 8170 Numerical Rounding Rules and Representation and Determination of Limit Values
GB/T 12806 laboratory glass instrument single standard line volumetric flask
GB/T 12807 laboratory glass instrument indexing pipette
GB/T 12808 laboratory glass instrument single standard line pipette
3 Principle
The sample is dissolved with nitric acid and hydrofluoric acid, and the perchloric acid is smoked to remove silicon. In the silver nitrate solution, ammonium persulfate is used to oxidize chromium to a positive hexavalent amount.
The amount of sodium carbonate solution is such that iron, manganese and other elements are precipitated and separated from chromium. Divide part of the filtrate to make hexavalent chromium and diphenylcarbonyl in sulfuric acid medium
The diterpene reaction produces a purplish red compound, and its absorbance is measured at a wavelength of 550 nm of the spectrophotometer to calculate the mass fraction of chromium.
4 reagents
In the analysis, unless otherwise stated, only the reagents confirmed as analytically pure are used, and the test water is the third and third grades specified in GB/T 6682.
Distilled water or water of comparable purity.
4.1 Nitric acid, ρ = 1.42 g/mL.
4.2 Hydrofluoric acid, ρ = 1.15 g/mL.
4.3 Perchloric acid, ρ = 1.67 g/mL.
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