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GB/T 14849.11-2016 English PDF

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GB/T 14849.11-2016: Methods for chemical analysis of silicon metal -- Part 11: Determination of chromium content - 1, 5-Diphenylcarbohydrazide spectrophotometric method
Status: Valid
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GB/T 14849.11-2016English139 Add to Cart 3 days [Need to translate] Methods for chemical analysis of silicon metal -- Part 11: Determination of chromium content - 1, 5-Diphenylcarbohydrazide spectrophotometric method Valid 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


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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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