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GB/T 15249.2-2009: Methods for chemical analysis of crude gold -- Part 2: Determination of silver content -- Fire assay gravimetric and EDTA titrimetric methods
Status: Valid GB/T 15249.2: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 15249.2-2009 | English | 189 |
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Methods for chemical analysis of crude gold -- Part 2: Determination of silver content -- Fire assay gravimetric and EDTA titrimetric methods
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GB/T 15249.2-2009
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| GB/T 15249.2-1994 | English | 199 |
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Crude Gold-Determination of silver content-EDTA titrimetric method
| Obsolete |
GB/T 15249.2-1994
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PDF similar to GB/T 15249.2-2009
Basic data | Standard ID | GB/T 15249.2-2009 (GB/T15249.2-2009) | | Description (Translated English) | Methods for chemical analysis of crude gold -- Part 2: Determination of silver content -- Fire assay gravimetric and EDTA titrimetric methods | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H15 | | Classification of International Standard | 77.120.70 | | Word Count Estimation | 8,848 | | Date of Issue | 2009-05-06 | | Date of Implementation | 2009-10-01 | | Older Standard (superseded by this standard) | GB/T 15249.2-1994 | | Regulation (derived from) | National Standard Approval Announcement 2009 No.6 (Total No.146) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies: Method 1: Scope fire assay gravimetric method for the determination of the amount of silver | GB/T 15249.2-2009: Methods for chemical analysis of crude gold -- Part 2: Determination of silver content -- Fire assay gravimetric and EDTA titrimetric methods
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Methods for chemical analysis of crude gold Part 2. Determination of silver content Fire assay gravimetric and EDTA titrimetric methods
ICS 77.120.70
H15
National Standards of People's Republic of China
Replacing GB/T 15249.2-1994
Crude Gold Analysis
Part 2. Determination of silver content
Fire assay gravimetric and EDTA titration
Posted 2009-05-06 2009-10-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
GB/T 15249 "Crude Gold analysis method" is divided into the following five sections.
--- Part 1. Determination of the amount of gold fire assay gravimetric method;
--- Part 2. Determination of the amount of silver fire assay gravimetric and EDTA titration;
--- Part 3. Determination of copper content iodometry;
--- Part 4. Determination of lead content EDTA titration;
--- Part 5. Determination of mercury content - Cold atomic absorption spectrometry.
This section GB/T 15249 Part 2.
This Part replaces GB/T 15249.2-1994 "Crude Gold analysis method EDTA titration method for the determination of silver content."
This portion of the GB/T 15249.2-1994 compared to the main changes are as follows.
--- On the basis of the content of the original standard adds content determination fire assay gravimetric method for silver content and the method of arbitration as a method;
--- Text format was revised; increase the "Preface", as described in GB/T 15249 "Methods for chemical analysis of crude gold" composition
Partial revision of the standard and background information;
--- Remove the old version of "reference standard" clause, "the term" clause, and the "principle of the method" clause text was re-expressed;
--- Increased clause "samples";
--- Remove the old version of "allowable difference" clause;
--- Added "precision" clause, "quality assurance and control" clause.
This section proposed by the People's Bank of China.
This part of the National Standardization Technical Committee on Finance (SAC/TC180) centralized.
This section is responsible for drafting the Shenyang Mint.
This part by the Chengdu Banknote Printing Company, Changchun Gold Research Institute, Shanghai Mint, Beijing Mining Research Institute, Nanjing Mint participated in the drafting.
The main drafters of this section. Wang Yu, Chen Jie, Chen Feifei, Wang Zisen, Linle Qin, Chu Ling Bao Long Shujie, Meng Bo, Zhu Muping, Dupei Yong,
Zhuxiu Fen, Huang Minhua.
This part of the standard replaces the previous editions are.
--- GB/T 15249.2-1994.
Crude Gold Analysis
Part 2. Determination of silver content
Fire assay gravimetric and EDTA titration
Method 1 a fire assay gravimetric method for the determination of the amount of silver
1.1 Scope
This section GB/T 15249 specifies the method for determination of crude gold silver content.
This section applies to the determination of crude gold (gold mining, smelting and recycling crude metal products such as gold) silver content. Determination of the mass fraction range of silver.
0.50% - 40.00%.
When a sample containing the influence of interference element fire assay gravimetric method for the measurement accuracy (such as iridium, palladium, platinum, rhodium, ruthenium and osmium), this section will not
Be applicable.
1.2 Principle of the method
Weigh a certain quality of crude gold samples, wrapped in lead foil is carried out at a high temperature molten ash blown state, lead and gold and silver and base metals are oxidized stars
Away, said gold and silver have combined grain quality and the amount of gold fire assay sample were measured by subtraction calculations and measurement along with the synthesis of gold and silver standard after correction
Calculate the mass fraction of silver.
1.3 Reagents and materials
Unless otherwise indicated in the analysis using only recognized as analytical grade reagents and distilled or deionized water or equivalent purity.
1.3.1 lead foil. pure lead (mass fraction of not less than 99.99%) processed into a length of about 51mm, a thickness of about 0.1mm square sheet.
1.3.2 Silver. the mass fraction of not less than 99.99%.
1.3.3 gold. the mass fraction of not less than 99.99%.
1.3.4 nitric acid (1 + 1).
1.3.5 nitric acid (1 + 2).
1.4 instruments and appliances
1.4.1 Box-type high-temperature furnace.
1.4.2 scales. a sense of the amount of 0.01mg.
1.4.3 cupel
1.4.3.1 ashes dish. animal ashes made from the ashes of the best sheep. The animal bones crushed into ashes after firing the following particle size 0.175mm
Ashes powder, add 10% to 15% of the water pressing on the gray ash pan dish machine, natural drying after use. Ashes dish Dimensions. Diameter 30mm, high
Of 23mm, an inner diameter of 26mm, the concave depth 10mm.
1.4.3.2 magnesia cupel. Calcined magnesia powder (particle size 0.147mm) and 525 Portland cement by mixing a small amount of water 85.15
Pressing, dry naturally after use. Magnesium oxide ash pan size. diameter 40mm, height 25mm, inner diameter of 30mm, the depth of the concave
15mm.
1.4.4 grind machine. small, rolled up to a thickness of 0.1mm.
1.5 Sample
To avoid contamination of the sample surface, the heat can be used hydrochloric acid (1 + 1) soak 15min. Washed by the water after washing with alcohol or acetone twice,
Drying in the oven at 105 ℃ ~ 110 ℃.
1.6 Analysis Steps
1.6.1 Gold, silver forecast given
1.6.1.1 Weigh 0.5g sample (1.5) in duplicate, to the nearest 0.00001g, wherein a lead foil packet (1.3.1) and the other based on the estimated
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