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Methods for chemical analysis of silicon metal -- Part 11: Determination of chromium content - 1, 5-Diphenylcarbohydrazide spectrophotometric method
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GB/T 14849.11-2016
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Basic data Standard ID | GB/T 14849.11-2016 (GB/T14849.11-2016) | Description (Translated English) | Methods for chemical analysis of silicon metal -- Part 11: Determination of chromium content - 1, 5-Diphenylcarbohydrazide spectrophotometric method | Sector / Industry | National Standard (Recommended) | Classification of Chinese Standard | H12 | Classification of International Standard | 77.120.10 | Word Count Estimation | 7,726 | Date of Issue | 2016-08-29 | Date of Implementation | 2017-07-01 | Regulation (derived from) | National Standard Announcement 2016 No.14 | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China |
GB/T 14849.11-2016: Methods for chemical analysis of silicon metal -- Part 11: Determination of chromium content - 1, 5-Diphenylcarbohydrazide spectrophotometric method ---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Methods for chemical analysis of silicon metal - Part 11. Determination of chromium content - 1, 5-Diphenylcarbohydrazide spectrophotometric method
ICS 77.120.10
H12
National Standards of People's Republic of China
Chemical silicon chemical analysis method
Part 11. determination of chromium content
Diphenylcarbazide spectrophotometric method
Part 11. Determination ofchromiumcontent-
1,5-Diphenylcarbohydrazidespectrophotometric method
2016-08-29 released
2017-07-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People 's Republic of China
China National Standardization Management Committee released
Foreword
GB/T 14849 "Industrial silicon chemical analysis method" is divided into 11 parts.
- Part 1. Determination of iron content - 1,10 - phenanthroline spectrophotometric method;
- Part 2. Determination of aluminum content - Chromazurol - spectrophotometric method;
Part 3. Determination of calcium content
- Part 4. Determination of impurity element content - Inductively coupled plasma atomic emission spectrometry;
- Part 5. Determination of impurity element content - X - ray fluorescence spectroscopy;
- Part 6. Determination of carbon content - Infrared absorption method;
- Part 7. Determination of phosphorus content - Phosphorolybdenum blue spectrophotometric method;
- Part 8. Determination of copper content - Atomic absorption spectroscopy;
- Part 9. Determination of titanium content - Diantipyrylmethane spectrophotometric method;
- Part 10. Determination of mercury content - Atomic fluorescence spectrometry;
- Part 11. Determination of chromium content - Diphenylcarbazide spectrophotometric method.
This part is part 11 of GB/T 14849.
This part is drafted in accordance with the rules given in GB/T 1.1-2009.
This part is made by China Nonferrous Metals Industry Association.
This part is the national nonferrous Metals Standardization Technical Committee (SAC/TC243).
This part is responsible for drafting unit. SGS Standard Technical Service Co., Ltd., Kunming Metallurgical Research Institute.
This part participates in the drafting unit. Beijing Mining and Metallurgy Research Institute, China Aluminum Industry Zhengzhou Nonferrous Metal Research Institute Co., Ltd., Beijing Nonferrous Metals
Research Institute, the standard standard Technology Services Limited Guangzhou Branch.
The main drafters of this part. Yang Chen, Cheng Shuqiang, Hu Zhitao, Liu Yingbo, Luo Shun, Li Min, Peng Sihui, Shi Lei, Tong Ling, Qi Yujing,
Hu Xuan, Wang Li
Chemical silicon chemical analysis method
Part 11. determination of chromium content
Diphenylcarbazide spectrophotometric method
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 (ρ1.42g/mL).
4.2 hydrofluoric acid (ρ1.14g/mL).
4.3 sulfuric acid (ρ1.84g/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 ℃ drying and constant weight, accurately weighed 0.1415g, placed in 150mL
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