GB/T 14849.11-2016Methods for chemical analysis of silicon metal - Part 11: Determination of chromium content - 1,5-Diphenylcarbohydrazide spectrophotometric method (English PDF)
工业硅化学分析方法 第11部分：铬含量的测定 二苯碳酰二肼分光光度法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
August 29, 2016
Implementation date
July 1, 2017
Scope
GB/T 14849.11-2016 is the English-translated version of 工业硅化学分析方法 第11部分：铬含量的测定 二苯碳酰二肼分光光度法.
GB/T 14849.11-2016 is the Chinese standard "Methods for chemical analysis of silicon metal - Part 11: Determination of chromium content - 1,5-Diphenylcarbohydrazide spectrophotometric method".
Its scope clause reads: This part of GB/T 14849 specifies the determination of chromium content in industrial silicon. This part is suitable for the determination of chromium in industrial silicon, the determination range.
0.0010% ~ 0.0500%. Its clauses include normative reference documents; method summary; reagent.
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Document preview — GB/T 14849.11-2016
National Standard of the People's Republic of China
- ICS
- 77.120.10
- Classification
- H 12
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 normative reference documents
- 3 method summary
- 4 reagent
1 Scope
This part of GB/T 14849 specifies the determination of chromium content in industrial silicon.
This part is suitable for the determination of chromium in industrial silicon, the determination range. 0.0010% ~ 0.0500%.
2 normative reference documents
The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article
Pieces. For undated references, the latest edition (including all modifications) applies to this document.
GB/T 6682 Analytical laboratory water specifications and test methods
Representation and Judgment of Numerical Correction Rule and Limit Value of GB/T 8170
3 method summary
Samples with hydrofluoric acid and nitric acid decomposition, sulfuric acid smoke to remove silicon, fluorine and other elements, the residue dissolved with sulfuric acid. In sulfuric acid solution, with permanganic acid
Potassium oxidation of chromium to hexavalent, the use of sodium carbonate precipitation separation of iron and other interfering elements, hexavalent chromium and dibenzoyl hydrazine reaction to produce purple
The absorbance was measured at a wavelength of 540 nm.
4 reagent
Unless otherwise stated, the reagents used in this section are analytical reagents that conform to national or industry standards and are of the same
GB/T 6682 specified in the distilled water.
4.1
nitric acid (rho1.42g/mL).
4.2
hydrofluoric acid (rho1.14g/mL).
4.3
sulfuric acid (rho1.84g/mL).
4.4
Sulfuric acid (1 4).
4.5
Sulfuric acid (1 6).
4.6 potassium permanganate solution (10g/L)
Weigh 1.0g potassium permanganate dissolved in about 50mL of water, diluted with water to 100mL, with the current allocation.
4.7 sodium carbonate solution (200g/L)
Weigh 80g anhydrous sodium carbonate in a 400mL beaker, add.200mL water dissolved, diluted with water to
400mL, stored in a polyethylene reagent bottle.
4.8 manganese sulfate solution (10g/L)
Weigh 2g of manganese sulfate (MnSO4 · 7H2O) dissolved in water, diluted with water to.200mL.
4.9
Diphenylcarbazide ethanol solution (0.02 mol/L). Weigh 0.24 g of diphenylcarbazide, placed in a 100 mL beaker,
45mL anhydrous ethanol, 5mL acetic acid, stirring to dissolve, save in a brown bottle, with the current distribution.
4.10 phenolphthalein ethanol solution (1g/L)
Weigh 0.1g phenolphthalein dissolved in anhydrous ethanol, diluted with ethanol to 100mL.
4.11 chromium standard storage solution
the potassium dichromate reference reagent at 150 °C drying and constant weight, accurately weighed 0.1415g, placed in 150mL […]
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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Related Standards
GB/T 14849.1-2020 — Methods for chemical analysis of silicon metal—Part 1: Determination of iron content
GB/T 14849.10-2016 — Methods for chemical analysis of silicon metal - Part 10: Determination of mercury content - Atomic fluorescence spectrometry method
GB/T 14849.2-2007 — Methods for chemical analysis of silicon metal - Part 2: Determination of aluminum content - Chrome azurol S spectrophotometric method
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