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GB/T 7739.3-2019 English PDF

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GB/T 7739.3-2019: Methods for chemical analysis of gold concentrates -- Part 3: Determination of arsenic content
Status: Valid

GB/T 7739.3: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 7739.3-2019English199 Add to Cart 3 days [Need to translate] Methods for chemical analysis of gold concentrates -- Part 3: Determination of arsenic content Valid GB/T 7739.3-2019
GB/T 7739.3-2007English399 Add to Cart 3 days [Need to translate] Methods for chemical analysis of gold concentrates -- Part 3: Determination of arsenic contents Obsolete GB/T 7739.3-2007
GB/T 7739.3-1987English199 Add to Cart 2 days [Need to translate] Methods for chemical analysis of gold concentrates--The silver diethyldithiocarbamate spectrophotometric method for the determination of arsenic content Obsolete GB/T 7739.3-1987

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Basic data

Standard ID GB/T 7739.3-2019 (GB/T7739.3-2019)
Description (Translated English) Methods for chemical analysis of gold concentrates -- Part 3: Determination of arsenic content
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard D46
Classification of International Standard 77.060.99
Word Count Estimation 10,132
Date of Issue 2019-12-31
Date of Implementation 2020-11-01
Issuing agency(ies) State Administration for Market Regulation, China National Standardization Administration

GB/T 7739.3-2019: Methods for chemical analysis of gold concentrates -- Part 3: Determination of arsenic content


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Methods for chemical analysis of gold concentrates--Part 3. Determination of arsenic content ICS 73.060.99 D46 National Standards of People's Republic of China Replaces GB/T 7739.3-2007 Gold concentrate chemical analysis method Part 3. Determination of arsenic content Part 3. Determinationofarseniccontent 2019-12-31 release 2020-11-01 implementation State Administration of Market Supervision Published by the National Standardization Administration

Foreword

GB/T 7739 `` Chemical Analysis Methods for Gold Concentrates '' is divided into the following sections. --- Part 1. Determination of the amount of gold and silver; --- 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, chromium, cadmium, chromium, arsenic, and mercury; inductively coupled plasma atomic emission spectrometry; --- Part 14. Determination of plutonium by inductively coupled plasma atomic emission spectrometry and inductively coupled plasma mass spectrometry. This part is the third part of GB/T 7739. This section is drafted in accordance with the rules given in GB/T 1.1-2009. This section replaces GB/T 7739.3-2007 "Chemical analysis methods for gold concentrates-Part 3. Determination of arsenic content", and GB/T 7739.3- Compared with.2007, the main technical changes in addition to editorial changes are as follows. --- Added "repeated" clauses and "reproducible" requirements (see 2.7 and 3.6); --- Removed the "allowable difference" requirement (see 2.7 and 4.6 of the.2007 version); --- Deleted the "Iodometric method for the determination of arsenic" (see Chapter 3 of the.2007 edition); --- Modified silver diethyldithiocarbamate spectrophotometry, ammonium ferric sulfate solution instead of copper sulfate, test steps adjusted (See 2.5.3.3, 2.5.3.3 of the.2007 version); --- The base phosphate titration method was modified to the potassium dichromate titration method, and the measurement range of the potassium dichromate titration method was "0.15% ~ 15.00%" (See Chapters 1 and 3, Chapter 4 of the.2007 edition). This part is proposed and managed by the National Gold Standardization Technical Committee (SAC/TC379). This section was drafted. 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 Limited company. The main drafters of this section. Chen Yonghong, Su Guangdong, Lu Xingen, Meng Xianwei, Liu Zhenghong, Hong Bo, Luan Haiguang, Wang Lili, Jiang Xingwei, Zhang Junfeng, Sui Junyong, Wang Lingyan, Xi Lijun, Chen Diangeng, Lu Xiaolong, Xie Yanhong, Zhu Yansheng, Hu Zhanfeng, Guo Yaqin, Liu Hongfei, Zhang Guangsheng. The previous versions of the standards replaced by this section are. --- GB/T 7739.3-1987, GB/T 7739.3-2007. Gold concentrate chemical analysis method Part 3. Determination of arsenic content

1 Scope

This part of GB/T 7739 specifies the method for the determination of arsenic in gold concentrates. This section applies to the determination of arsenic in gold concentrates. Method 1 measurement range. 0.050% ~ 0.350%; Method 2 measurement range. 0.15% ~ 15.00%. 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 arsenide 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 (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 (1 1). 2.2.9 Triethanolamine (or triethylamine) trichloromethane solution (3 97). 2.2.10 Ferric ammonium sulfate solution [ρ (Fe) = 20g/L]. Weigh 108g of ferric ammonium sulfate [NH4Fe (SO4) 2 · 2H2O], add water and 10mL Sulfuric acid (2.2.5), stir and dissolve, 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, leave it overnight, and use after filtering. Store in a 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 and 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

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