GB/T 20899.2-2019 English PDF

US$119.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 20899.2-2019: Methods for chemical analysis of gold ores -- Part 2: Determination of silver content -- Flame atomic absorption spectrometric method
Status: Valid

GB/T 20899.2: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 20899.2-2019	119	Add to Cart	3 days	Methods for chemical analysis of gold ores -- Part 2: Determination of silver content -- Flame atomic absorption spectrometric method	Valid
GB/T 20899.2-2007	239	Add to Cart	3 days	Methods for chemical analysis of gold ores -- Part 2: Determination of silver contents	Obsolete

Similar standards

GB/T 42333   GB/T 20899.1   YS/T 254.1   GB/T 20899.10   GB/T 20899.9   GB/T 20899.8   

Basic data

Standard ID: GB/T 20899.2-2019 (GB/T20899.2-2019)
Description (Translated English): Methods for chemical analysis of gold ores -- 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: 6,640
Date of Issue: 2019-12-10
Date of Implementation: 2020-11-01
Older Standard (superseded by this standard): GB/T 20899.2-2007
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration
Summary: This standard specifies the method for the determination of silver in gold ore. This standard applies to the determination of silver in gold ore. Measurement range: 2.00 g/t~1 000.0 g/t.

GB/T 20899.2-2019: Methods for chemical analysis of gold ores -- 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 ores--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 20899.2-2007 Chemical analysis method of gold ore Part 2. Determination of silver content Flame atomic absorption spectrometry Part 2. Determinationofsilvercontent- 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 second 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 20899.2-2007 "Methods for chemical analysis of gold ores Part 2. Determination of silver content". Compared with GB/T 20899.2-2007, 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 pre-treatment method, using polytetrafluoroethylene beaker tetraacid solution (see 6.3,.2007 version 6.3.1). 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., Henan Zhongyuan Gold Smeltery Co., Ltd., Shenzhen Gold Gold 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., Zhengzhou Institute of Comprehensive Utilization of Mineral Resources, Chinese Academy of Geological Sciences. The main drafters of this section. Chen Yonghong, Gao Zhenguang, Meng Xianwei, Hong Bo, Guan Guojun, Dang Hongqing, Jiang Yanshui, Zhao Dongjie, Yang Pei, Xu Chaoxiu, Yang Yanpeng, Qiang Gaikun, Li Feifan, Wang Jianzheng, Cai Pengna, Wang Qingli, Liu Xiaoji, Gao Xiaofei. The previous versions of the standards replaced by this section are. --- GB/T 20899.2-2007. Chemical analysis method of gold ore Part 2. Determination of silver content Flame atomic absorption spectrometry

1 Scope

This section of GB/T 20899 specifies the method for determining the amount of silver in gold ores. This section applies to the determination of silver in gold ores. Measurement range. 2.00g/t ~ 1000.0g/t.

2 Principle

The sample was decomposed by hydrochloric acid, nitric acid, perchloric acid, and hydrofluoric acid. In a dilute hydrochloric acid medium, the wavelength was 328.1 nm in a flame atomic absorption spectrometer. At the same time, the absorbance value of silver was measured by air-acetylene flame, 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 Perchloric acid (ρ = 1.67g/mL). 3.4 Hydrofluoric acid (ρ = 1.15g/mL). 3.5 Hydrochloric acid solution (3 17). 3.6 Silver standard storage solution. Weigh 0.5000g of pure silver (wAg≥99.99%), put it in a 100mL beaker, and add 20mL nitric acid (3.2), heat to completely dissolve, remove nitrogen oxides by boiling, remove and cool, move into 1000mL brown volumetric flask with water without chloride ion In 30 mL 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. Pipette 50.00mL of the silver standard storage solution (3.6), and put it in a 500mL brown volumetric flask, and add 10mL nitric acid (3.2) Dilute to the mark with chloride-free water and mix well. 1 mL of this solution contained 50 μg of silver.

4 instruments

Atomic absorption spectrometer with silver hollow cathode lamp. Under the optimal working 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 matrix of the measurement solution, 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; Use the lowest concentration standard solution (not "zero" standard solution) to measure 11 absorbances, 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 difference between the absorbance difference between the highest segment and the absorbance difference between the lowest segment. The ratio should not be less than 0.8. ......

Image     

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 20899.2-2019_English be delivered?

Answer: Upon your order, we will start to translate GB/T 20899.2-2019_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 20899.2-2019_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 20899.2-2019_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

Question 5: Should I purchase the latest version GB/T 20899.2-2019?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 20899.2-2019 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.