GB/T 7739.2-2019 English PDF

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GB/T 7739.2-2019: Methods for chemical analysis of gold concentrates -- Part 2: Determination of silver content -- Flame atomic absorption spectrometric method
Status: Valid

GB/T 7739.2: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 7739.2-2019	139	Add to Cart	3 days	Methods for chemical analysis of gold concentrates -- Part 2: Determination of silver content -- Flame atomic absorption spectrometric method	Valid
GB/T 7739.2-2007	239	Add to Cart	3 days	Methods for chemical analysis of gold concentrates -- Part 2: Determination of silver contents	Obsolete
GB/T 7739.2-1987	199	Add to Cart	2 days	Methods for chemical analysis of gold concentrates--The flame atomic absorption spectrophotometric methods for the determination of silver content	Obsolete

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Basic data

Standard ID: GB/T 7739.2-2019 (GB/T7739.2-2019)
Description (Translated English): Methods for chemical analysis of gold concentrates -- Part 2: Determination of silver content -- Flame atomic absorption spectrometric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: D46
Classification of International Standard: 73.060.99
Word Count Estimation: 7,772
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 7739.2-2019: Methods for chemical analysis of gold concentrates -- Part 2: Determination of silver content -- Flame atomic absorption spectrometric 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 gold concentrates--Part 2. Determination of silver content--Flame atomic absorption spectrometric method ICS 73.060.99 D46 National Standards of People's Republic of China Replaces GB/T 7739.2-2007 Gold concentrate chemical analysis method Part 2. Determination of silver content Flame atomic absorption spectrometry Part 2. Determinationofsilvercontent- 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, 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 second 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 7739.2-2007 "Chemical analysis methods for gold concentrates-Part 2. Determination of silver content". Compared with GB/T 7739.2-2007, the main technical changes in this section are as follows. --- Increased "repetitive" and "reproducible" requirements (see 8.1 and 8.2); --- Removed the "allowable difference" requirement (see Chapter 8 of the.2007 edition); --- Modified the sample preparation method (see 6.3,.2007 version 6.3). This part is proposed and managed by the National Gold Standardization Technical Committee (SAC/TC379). Drafting organizations of this section. Changchun Gold Research Institute Co., Ltd., Henan Zhongyuan Gold Smelter Co., Ltd., Shenzhen Gold and Silver Jewelry Inspection and Research Center Co., Ltd., Zijin Mining Group Co., Ltd., North Mine Detection Technology Co., Ltd., SDIC Jincheng Metallurgy Co., Ltd. Responsible company, Chifeng Gold Xiongfeng Environmental Protection Technology Co., Ltd., Shandong Guoda Gold Co., Ltd., Zhaojin Mining Co., Ltd. Golden Wing Ling Gold Mine, Henan Gold Industry Technology Research Institute Co., Ltd. The main drafters of this section. Chen Yonghong, Gao Zhenguang, Lu Xingen, Hong Bo, Guan Guojun, Dang Hongqing, Jiang Yanshui, Successive Entitlement, Yang Pei, Luo Ronggen, Yang Yanpeng, Nan Junfang, Li Tieshuan, Kong Lingqiang, Weng Zhanping, Wang Qingli, Yang Qingyu. The previous versions of the standards replaced by this section are. --- GB/T 7739.2-1987, GB/T 7739.2-2007. Gold concentrate chemical analysis method Part 2. Determination of silver content Flame atomic absorption spectrometry

1 Scope

GB/T 7739 specifies the atomic absorption spectrometry method for silver content in gold concentrate. This section applies to the determination of silver in gold concentrate by atomic absorption spectrometry. Measurement range. 10.00g/t ~.2000.0g/t.

2 Principle

The sample was decomposed by hydrochloric acid, nitric acid and perchloric acid.In a dilute hydrochloric acid medium, the flame atomic absorption spectrometer was at a wavelength of 328.1 The gas-acetylene flame was used to measure the absorbance of silver, and the amount of silver was calculated according to the standard curve method.

3 reagents

Unless otherwise stated, only reagents and distilled or deionized or fairly pure water identified as analytically pure were used in the analysis. 3.1 Hydrochloric acid (ρ = 1.19g/mL). 3.2 Nitric acid (ρ = 1.42g/mL). 3.3 Sulfuric acid (ρ = 1.83g/mL). 3.4 Perchloric acid (ρ = 1.67g/mL). 3.5 Hydrochloric acid (3 17). 3.6 Silver standard storage solution (500μg/mL). Weigh 0.5000g of pure silver (mass fraction ≥99.99%), put it in a 100mL beaker, add Add 20mL of nitric acid (3.2), heat to completely dissolve, boil to remove the nitrogen oxides, remove and cool, and transfer to 1000mL with chloride-free water In a brown volumetric flask, add 30mL of nitric acid (3.2), dilute to the mark with chloride-free water, and mix. 1 mL of this solution contained 0.5000 mg of silver. 3.7 Silver standard solution (50 μg/mL). Pipette 50.00 mL of the silver standard storage solution (3.6) into a 500 mL brown volumetric flask and add 10 mL Nitric acid (3.2), diluted to the mark with chloride-free water, and mixed. 1 mL of this solution contained 50 μg of silver.

4 instruments

Atomic absorption spectrometer with silver hollow cathode lamp. Under the optimal conditions of the instrument, any flame atomic absorption spectrometer that can meet the following indicators Can be used. --- Sensitivity. In a solution consistent with the measurement solution matrix, the characteristic concentration of silver should not be greater than 0.034 μg/mL. --- Precision. Use the highest concentration standard solution to measure 11 absorbances, and the standard deviation should not exceed 1.0% of the average absorbance; Measure the absorbance 11 times with the lowest concentration standard solution (not "zero" standard solution), and the standard deviation should not exceed the highest concentration The standard solution has an average absorbance of 0.5%. --- Standard curve linear. Divides the standard curve into five segments according to the concentration. The ratio should not be less than 0.8. ......

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