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GB/T 1819.12-2017: Methods for chemical analysis of tin concentrates -- Part 12: Determination of silicon dioxide content -- The silicon molybdenum blue spectrophotometry and sodium hydroxide titration
Status: Valid GB/T 1819.12: Evolution and historical versions
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| GB/T 1819.12-2017 | English | 199 |
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Methods for chemical analysis of tin concentrates -- Part 12: Determination of silicon dioxide content -- The silicon molybdenum blue spectrophotometry and sodium hydroxide titration
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GB/T 1819.12-2017
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| GB/T 1819.12-2004 | English | 199 |
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Methods for chemical analysis of tin concentrates -- Determination of silicon dioxide content -- The silicon molybdenum blue spectrophotometric method
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GB/T 1819.12-2004
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Basic data | Standard ID | GB/T 1819.12-2017 (GB/T1819.12-2017) | | Description (Translated English) | Methods for chemical analysis of tin concentrates -- Part 12: Determination of silicon dioxide content -- The silicon molybdenum blue spectrophotometry and sodium hydroxide titration | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | D41 | | Classification of International Standard | 73.060 | | Word Count Estimation | 10,116 | | Date of Issue | 2017-09-29 | | Date of Implementation | 2018-04-01 | | 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 1819.12-2017: Methods for chemical analysis of tin concentrates -- Part 12: Determination of silicon dioxide content -- The silicon molybdenum blue spectrophotometry and sodium hydroxide titration
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Methods for chemical analysis of tin concentrates - Part 12. Determination of silicon dioxide content - The silicomolybdenum blue spectrophotometry and sodium hydroxide titration
ICS 73.060
D41
National Standards of People's Republic of China
Replacing GB/T 1819.12-2004
Methods for chemical analysis of tin concentrates
Part 12. Determination of the amount of silica
Silicon molybdenum blue spectrophotometry and sodium hydroxide titration
Methods for chemical analysis of tinconcentrates-
Part 12.Determinationofsilicondioxidecontent-
2017-09-29 Posted
2018-04-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
China National Standardization Administration released
Foreword
GB/T 1819 "tin concentrate chemical analysis method" is divided into 21 parts.
--- Part 1. Determination of moisture thermal drying method;
--- Part 2. Determination of tin content potassium iodate titration;
--- Part 3. Determination of iron content cerium sulfate titration method;
--- Part 4. Determination of lead content by flame atomic absorption spectrometry and Na2 EDTA titration;
--- Part 5. Determination of arsenic Arsenic antimony molybdenum blue spectrophotometry and iodometric titration;
--- Part 6. Determination of the amount of antimony; malachite green spectrophotometry and flame atomic absorption spectrometry;
--- Part 7. Determination of bismuth content by flame atomic absorption spectrometry;
--- Part 8. Determination of zinc content by flame atomic absorption spectrometry;
--- Part 9. Determination of tungsten oxide content; thiocyanate spectrophotometry;
--- Part 10. Determination of sulfur content High-frequency induction furnace combustion infrared absorption method and potassium iodate titration;
--- Part 11. Determination of the amount of aluminum oxide chromium azure S spectrophotometry;
--- Part 12. Determination of the amount of silica silicon molybdenum blue spectrophotometry and sodium hydroxide titration;
--- Part 13. Determination of magnesia, calcium oxide content; Flame atomic absorption spectrometry;
--- Part 14. Determination of copper content by flame atomic absorption spectrometry;
--- Part 15. Determination of fluorine content ion selective electrode method;
--- Part 16. Determination of silver content; Flame atomic absorption spectrometry;
--- Part 17. Determination of mercury content; atomic fluorescence spectrometry;
--- Part 18. Determination of nickel content by flame atomic absorption spectrometry;
--- Part 19. Determination of cobalt content; Flame atomic absorption spectrometry;
--- Part 20. Determination of cadmium content by flame atomic absorption spectrometry;
--- Part 21. Determination of calcium, magnesium, copper, lead, zinc, arsenic, antimony, bismuth, silver content Inductively coupled plasma atomic emission spectrometry.
This section GB/T 1819 Part 12.
This section drafted in accordance with GB/T 1.1-2009 given rules.
This Part Replaces GB/T 1819.12-2004 "Methods for chemical analysis of tin concentrates - Determination of the amount of silica - Molybdenum blue spectrophotometric
law".
This section compared with GB/T 1819.12-2004, Method 1 silicon molybdenum blue spectrophotometry are mainly the following changes.
--- Reducing agent from the original "mixed solution" modified "ascorbic acid solution";
--- Measurement wavelength from the original "660nm" revised "810nm";
--- Modify the precision part;
--- Increase the test report terms.
Method 2 sodium hydroxide titration method for the new method.
This part is proposed by China Nonferrous Metal Industry Association.
This part of the National Non-ferrous Metal Standardization Technical Committee (SAC/TC243) centralized.
This section is responsible for the drafting unit. Yunnan Tin Industry Co., Ltd..
This section participates in the drafting unit. Yunnan Tin Group (Holdings) Co., Ltd., China Nonferrous Guilin Institute of Mineral Geology Co., Ltd.
Division, Guangxi Huaxi Group Co., Ltd., China Certification & Inspection Group Guangxi Co., Ltd., Guangdong Province Industry Analysis and Testing Center.
The main drafters of this section Xie Hui Fang, Zhang Li, Lu Qiyu, Feng Baoqiong, Zhang Hongling, Hu Zhen, Wang Zi Yan, Tang Jiansuo, Wang Qing, Huang Xuemei,
Pang Xiaozhen, Zhong Guiyuan, Wei Yajuan, Xie Hui, Li Yuhong, Hai Lan, Su Aiping, Zhang Ting, Chen Xiaodong, Qiao Xiaofang, Ma Li Bi, Xu Jie Yu.
This part replaces the standards previously issued as.
--- GB/T 1819.12-2004;
--- GB/T 1831-1979.
Methods for chemical analysis of tin concentrates
Part 12. Determination of the amount of silica
Silicon molybdenum blue spectrophotometry and sodium hydroxide titration
1 Scope
This section GB/T 1819 specifies the determination of the amount of silica in tin concentrates.
This section applies to the determination of silica content in tin concentrate method. Method 1 Determination range .0.10% ~ 10.00%; Method 2 Determination of Van
Wai .5.00% ~ 20.00%.
The overlapping part of the determination range is based on Method 2 for arbitration analysis.
2 Method 1 silicon molybdenum blue spectrophotometry
2.1 Method summary
The sample was melted and decomposed with sodium peroxide, leached with boiling water, and acidified with hydrochloric acid. In dilute hydrochloric acid medium, silicic acid and ammonium molybdate generated silicon molybdenum yellow;
Add hydrochloric acid, add oxalic acid, tartaric acid to eliminate the interference of phosphorus, arsenic and other elements, and use ascorbic acid to reduce silicon molybdenum yellow to silicon molybdenum blue. In the light
Meter wavelength 810nm, measuring the absorbance.
2.2 Reagents
Unless otherwise specified, only reagents that are identified as analytically pure and secondary water are used in the analysis.
2.2.1 Sodium peroxide.
2.2.2 anhydrous ethanol.
2.2.3 Hydrochloric acid (1 1).
2.2.4 hydrochloric acid (1 3).
2.2.5 potassium permanganate solution (30g/L).
2.2.6 Ammonium molybdate solution [(NH4) 6Mo7O24 4H2O] (100g/L) After filtration, use and store in a plastic bottle.
2.2.7 oxalic acid - tartaric acid mixed solution Weigh 100g of oxalic acid (H2C2O4 · 2H2O), 40gL () - tartaric acid (C4H6O6) dissolved in
Water, diluted with water to 1000mL, stored in plastic bottles.
2.2.8 Ascorbic acid solution (20g/L) Preparation with time.
2.2.9 Silica standard stock solution Weigh 1.0000g silica (wSiO299.99%, pre-fired at 800 ℃ to constant weight, placed in
Dryer cooled to room temperature) placed in a platinum crucible, add 5g of anhydrous sodium carbonate, mix, and then covered with 1g of anhydrous sodium carbonate at 1000 ℃
High temperature melting furnace 1h. Remove, cold, the water outside the crucible clean, placed in 100mL hot water Teflon beaker
Leach melt (can be slowly heated). After the leaching is complete, wash the crucible and cool. The solution into 1000mL volumetric flask, diluted with water to
Scale, mix well. 1 mL of this solution contains 1 mg of silica. Store in plastic bottle.
2.2.10 silica standard solution A. Pipette 25.00mL silica standard stock solution (2.2.9) in 500mL volumetric flask, water
Dilute to the mark and mix well. 1 mL of this solution contains 50 μg of silica. Store in plastic bottle.
2.2.11 silica standard solution B. Pipette 50.00mL silica standard solution (2.2.10) in 250mL volumetric flask, diluted with water
Release to the mark, mix well. 1 mL of this solution contains 10 μg of silica. Store in plastic bottle.
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