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YS/T 461.9: Evolution and historical versions
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| YS/T 461.9-2025 | English | RFQ |
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(Methods for chemical analysis of lead and zinc bulk concentrates - Part 9: Determination of silver and gold contents - Flame atomic absorption spectrometry and fire assay method)
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| YS/T 461.9-2013 | English | 159 |
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Methods for chemical analysis of lead and zinc bulk concentrates. Part 9: The determination of silver content. Flame atomic absorption spectrometry
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| YS/T 461.9-2003 | English | 239 |
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The methods for chemical analysis of lead and zinc bulk concentrates-The determination of silver content-The atomic absorption method
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Basic data
| Standard ID | YS/T 461.9-2025 (YS/T461.9-2025) |
| Description (Translated English) | (Methods for chemical analysis of lead and zinc bulk concentrates - Part 9: Determination of silver and gold contents - Flame atomic absorption spectrometry and fire assay method) |
| Sector / Industry | Nonferrous Metallurgy Industry Standard (Recommended) |
| Classification of Chinese Standard | H13 |
| Classification of International Standard | 77.120.60 |
| Date of Issue | 2025-08-19 |
| Date of Implementation | 2026-03-01 |
| Older Standard (superseded by this standard) | YS/T 461.9-2013, YS/T 461.10-2013 |
| Issuing agency(ies) | Ministry of Industry and Information Technology |
| Summary | This standard specifies methods for determining silver and gold content in mixed lead-zinc concentrate using both flame atomic absorption spectrometry and fire assay. This standard applies to the determination of silver and gold content in mixed lead-zinc concentrate. |
YS/T 461.9-2013: Methods for chemical analysis of lead and zinc bulk concentrates. Part 9: The determination of silver content. Flame atomic absorption spectrometry
---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 lead and zinc bulk concentrates Part 9. The determination of silver content Flame atomic absorption spectrometry
ICS 77.120.60
H13
People's Republic of China Nonferrous Metals Industry Standard
Replacing YS/T 461.9-2003
Lead and Zinc concentrates - Methods
Part 9. Determination of silver content
Flame Atomic Absorption Spectrometry
Part 9. Thedeterminationofsilvercontent-
Issued on. 2013-10-17
2014-03-01 implementation
Ministry of Industry and Information Technology of the People's Republic of China released
Foreword
YS/T 461 "Lead and Zinc concentrates - Methods" is divided into 11 parts.
--- Part 1. Determination of the amount of lead and zinc content Na2EDTA precipitation titration;
--- Part 2. Determination of iron content Na2EDTA titration;
--- Part 3. Determination of sulfur content of combustion - neutralization titration method;
--- Part 4. Determination of arsenic content of iodine titration;
--- Part 5. Determination of silicon dioxide content - Molybdenum blue spectrophotometric method;
--- Part 6. Determination of the amount of mercury atomic fluorescence spectrometry;
--- Part 7. Determination of cadmium content by flame atomic absorption spectrometry;
--- Part 8. Determination of copper content - Flame atomic absorption spectrometry;
--- Part 9. Determination of the amount of silver by flame atomic absorption spectrometry;
--- Part 10. the amount of gold and silver contents - fire assay;
--- Part 11. arsenic, bismuth, cadmium, cobalt, copper, nickel, antimony content - Inductively Coupled Plasma - Atomic Emission Spectrometry.
This is Part 9 YS/T 461's.
This section drafted in accordance with GB/T 1.1-2009 given rules.
The partial replacement of YS/T 461.9-2003 "Lead and Zinc concentrates - Methods for chemical analysis of silver content - Flame atomic absorption spectrometric
Law, "compared with the YS/T 461.9-2003, the main changes are as follows.
--- Text format has been modified;
--- Added "reproducibility" clause, delete the words "to allow poor" clause;
--- Added "the test report" requirement.
The non-ferrous metal part by the National Standardization Technical Committee (SAC/TC243) centralized.
YS/T 461 is responsible for drafting. Shenzhen Lingnan Nonferrous Metals Co., Baiyin Nonferrous Metals Group Co., Ltd.,
Beijing General Research Institute of Mining and Metallurgy.
This section is responsible for drafting. Shenzhen Lingnan Nonferrous Metals Co., Ltd. Shaoguan smelter.
Participated in the drafting of this section. Shenzhen Lingnan Nonferrous Metals Co. Fankou, Baiyin Nonferrous Group Co. Shares
Company, Beijing Mining Research Institute, Zhuzhou Smelter Group Co., Ltd., Western Mining Corporation xitiesan Branch, Hunan has
Color homes.
The main drafters of this section. Liu Renjie, Chen Tiejun, Tang Ping, Chen Ling of Pakistan Jianrong, Yindong Xia, Wang Haoying, Dian Chen Geng, Zhang Yanyun,
Lei Su letter, Du Feng, Li Li, Yang Deli, Pang Wenlin.
This part of the standard replaces the previous editions are.
--- YS/T 461.9-2003.
Lead and Zinc concentrates - Methods
Part 9. Determination of silver content
Flame Atomic Absorption Spectrometry
1 Scope
This section YS/T 461 specifies the method for determination of mixing zinc concentrates of silver content.
This section applies to the determination of mixing zinc concentrates of silver content. Measuring range. 50g/t ~ 500g/t.
2 Method summary
Samples with hydrochloric acid, nitric acid dissolved in 15% volume fraction of hydrochloric acid medium using air - acetylene flame atomic absorption spectrometer wave
Long 328.1nm at measuring the absorbance of silver. According to the standard curve method to calculate the content of silver.
3 Reagents
Unless otherwise indicated in the analysis using only recognized as analytical grade reagents and distilled or deionized water or equivalent purity.
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 nitric acid (11).
3.5 silver standard stock solution. Weigh 0.5000g metallic silver (wAg≥99.99%) in 100mL beaker, add 20mL of nitric acid
(3.4), a hot plate at low heat to dissolve completely get rid of boiling nitrogen oxides. Remove cooling to room temperature, transferred to 1000mL volumetric flask
Added 20mL of nitric acid (3.4), diluted with water containing no chlorine ions to the mark, and mix. This solution 1mL containing 0.5mg silver.
3.6 silver standard solution. Pipette 10.00mL silver standard stock solution (3.5) in 100mL flask, add 4mL nitric acid (3.4), with
Dilution water does not contain chlorine ions to the mark, and mix. This solution 1mL containing 50μg silver.
4 Instrument
Atomic absorption spectrometer attached Silver hollow cathode lamp.
Under optimum working conditions for those who can reach the following indicators can be used.
--- Characteristic concentration. a solution in the measurement matrix consistent solution, features silver concentration should not exceed 0.06μg/mL.
--- Precision. standard solution with the highest concentration of 10 times the absorbance measurements, the standard deviation should not exceed the average absorbance of 1.0%;
With the lowest concentration of standard solution (not "zero" concentration of the standard) measuring the absorbance of 10 times, the standard deviation should not exceed the maximum
0.5% of the average concentration of the standard solution absorbance.
--- Linear curve. The curve is divided into five sections according to concentration, absorbance difference between the absorbance difference between the highest and the lowest segment of the segment
Ratio of not less than 0.8.
5 Sample
5.1 The specimen shall 0.100mm sieve through hole.
