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GB/T 20899.3-2019: Methods for chemical analysis of gold ores -- Part 3: Determination of arsenic content
Status: Valid GB/T 20899.3: Evolution and historical versions
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Methods for chemical analysis of gold ores -- Part 3: Determination of arsenic content
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GB/T 20899.3-2019
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| GB/T 20899.3-2007 | English | 319 |
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Methods for chemical analysis of gold ores -- Part 3: Determination of arsenic contents
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GB/T 20899.3-2007
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Basic data | Standard ID | GB/T 20899.3-2019 (GB/T20899.3-2019) | | Description (Translated English) | Methods for chemical analysis of gold ores -- Part 3: Determination of arsenic content | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | D46 | | Classification of International Standard | 73.060.99 | | Word Count Estimation | 10,137 | | Date of Issue | 2019-12-10 | | Date of Implementation | 2020-11-01 | | Older Standard (superseded by this standard) | GB/T 20899.3-2007 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | | Summary | This standard specifies the method for the determination of arsenic in gold ores. This standard is applicable to the determination of arsenic in gold ore. The measurement range of method 1 is: 0.050%~0.350%; the measurement range of method 2: 0.15%~5.00%. | GB/T 20899.3-2019: Methods for chemical analysis of gold ores -- Part 3: Determination of arsenic content
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Methods for chemical analysis of gold ores--Part 3. Determination of arsenic content
ICS 73.060.99
D46
National Standards of People's Republic of China
Replaces GB/T 20899.3-2007
Chemical analysis method of gold ore
Part 3. Determination of arsenic content
Part 3. Determinationofarseniccontent
2019-12-10 release
2020-11-01 implementation
State Administration of Market Supervision
Published by the National Standardization Management Committee
Foreword
GB/T 20899 `` Chemical Analysis Methods for Gold Ore '' is divided into the following sections.
--- Part 1. Determination of the amount of gold;
--- Part 2. Determination of silver content by flame atomic absorption spectrometry;
--- Part 3. Determination of arsenic content;
--- Part 4. Determination of copper content;
--- Part 5. Determination of lead content;
--- Part 6. Determination of zinc content;
--- Part 7. Determination of iron content;
--- Part 8. Determination of sulfur content;
--- Part 9. Determination of carbon content;
--- Part 10. Determination of the amount of antimony;
--- Part 12. Determination of arsenic, mercury, cadmium, lead and bismuth by atomic fluorescence spectrometry;
--- Part 13. Determination of lead, zinc, bismuth, cadmium, chromium, arsenic, and mercury; inductively coupled plasma atomic emission spectrometry;
--- Part 14. Determination of plutonium inductively coupled plasma atomic emission spectrometry and inductively coupled plasma mass spectrometry.
This part is the third part of GB/T 20899.
This section is drafted in accordance with the rules given in GB/T 1.1-2009.
This section replaces GB/T 20899.3-2007 "Chemical analysis methods for gold ores Part 3. Determination of arsenic content".
Compared with GB/T 20899.3-2007, the main technical changes in this section are as follows.
--- Increased "repetitive" and "reproducible" requirements (see 2.7 and 3.6);
--- Removed the "allowable difference" requirement (see.2007 version 2.7 and 3.6);
--- In method 1, ammonium ferric sulfate solution replaces copper sulfate, and the test steps are adjusted (see 2.5.3.3,.2007 version 2.5.3.3);
--- In method 2, standard solution of potassium dichromate replaces iodine, standard solution of ferrous ammonium sulfate replaces sodium arsenite, and sulfuric acid replaces sodium bicarbonate
(See 3.4.3.4, 3.4.3.4 of the.2007 version).
This part is proposed and managed by the National Gold Standardization Technical Committee (SAC/TC379).
This section was drafted by. Changchun Gold Research Institute Co., Ltd., Shandong Hengbang Smelting Co., Ltd., North Mine Detection Technology Co., Ltd.,
Zijin Mining Group Co., Ltd., Lingbao Gold Group Co., Ltd., Tongguan Zhongjin Smelting Co., Ltd., Jiangxi Sanhe Gold
Ltd.
The main drafters of this section. Chen Yonghong, Su Guangdong, Lu Xingen, Meng Xianwei, Liu Zhenghong, Hong Bo, Zhang Yanfeng, Song Jianwei, Luan Shaoyu,
Wang Feihu, Lu Qian, Zhang Yue, Tong Lijun, Chen Diangeng, Xia Zhenzhu, Lu Xiaolong, Hu Zhanfeng, Zhu Yansheng, Guo Yaqin, Liu Hongfei, Zhang Guangsheng.
The previous versions of the standards replaced by this section are.
--- GB/T 20899.3-2007.
Chemical analysis method of gold ore
Part 3. Determination of arsenic content
1 Scope
This part of GB/T 20899 specifies the method for the determination of arsenic in gold ores.
This section applies to the determination of arsenic in gold ore.Method 1 measurement range. 0.050% ~ 0.350%; method 2 measurement range. 0.15%
~ 5.00%.
2 Method 1. Silver diethyldithiocarbamate spectrophotometry
2.1 Principle
The sample was decomposed by acid, and arsenic was reduced by arsenic-free zinc particles in 1.0 mol/L ~ 1.5 mol/L sulfuric acid medium to generate arsenic gas.
Silver dithiocarbamate (hereinafter referred to as copper reagent silver salt) trichloromethane solution absorption. Silver ions in silver salts of copper reagents reduced by arsenide
It becomes red colloidal silver. The absorbance was measured at a wavelength of 530 nm of the spectrophotometer.
2.2 Reagents and materials
Unless otherwise stated, only reagents and distilled or deionized or fairly pure water identified as analytically pure were used in the analysis.
2.2.1 Arsenic-free zinc particles.
2.2.2 Potassium Chlorate.
2.2.3 Trichloromethane.
2.2.4 Nitric acid (ρ = 1.42g/mL).
2.2.5 Sulfuric acid solution (1 1).
2.2.6 Tartaric acid solution (400g/L).
2.2.7 Potassium iodide solution (300g/L).
2.2.8 Tin dichloride solution (400g/L). Prepared with hydrochloric acid solution (1 1).
2.2.9 Triethanolamine (or triethylamine) trichloromethane solution (3 97).
2.2.10 Ammonium ferric sulfate solution [ρ (Fe) = 20g/L]. Weigh 108g [NH4Fe (SO4) 2 · 2H2O], add water and 10mL sulfuric acid
(2.2.5) After stirring and dissolving, transfer to a 1000mL volumetric flask, dilute with water to the mark, and shake well.
2.2.11 Copper reagent silver salt trichloromethane solution (2g/L). Weigh 1g of copper reagent silver salt into a 1000mL reagent bottle, add 500mL three
Ethanolamine trichloromethane solution (2.2.9), stir to dissolve, stand still overnight, and use after filtering. Store in brown reagent bottle.
2.2.12 Arsenic standard solution (1000μg/mL). Certified standard solution.
2.2.13 Arsenic standard solution Ⅰ (100 μg/mL). Pipette 10.00 mL of arsenic standard solution (2.2.12) into a 100 mL volumetric flask and add 5 mL
Nitric acid (2.2.4), diluted with water to the mark, and mixed.
2.2.14 Arsenic standard solution Ⅱ (5 μg/mL). Transfer 5.00 mL of arsenic standard solution I (2.2.13) into a 100 mL volumetric flask, add 5 mL
Nitric acid (2.2.4), diluted with water to the mark, and mixed.
2.2.15 Lead acetate absorbent cotton. Soak the absorbent cotton in 100mL lead acetate solution (100g/L, containing 1mL glacial acetic acid), remove, and dry
After use.
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