GB/T 15072.2: Evolution and historical versions
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| GB/T 15072.2-2025 | English | RFQ |
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Method for chemical analysis of precious metal alloys - Part 2: Determination of silver content
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GB/T 15072.2-2025
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| GB/T 15072.2-2008 | English | 189 |
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Test method of precious metal alloys -- Determination of silver contents for silver alloys -- Potentiometer titration with sodium chloride
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GB/T 15072.2-2008
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| GB/T 15072.2-1994 | English | 199 |
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Silver alloys-Determination of silver content
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GB/T 15072.2-1994
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Basic data | Standard ID | GB/T 15072.2-2025 (GB/T15072.2-2025) | | Description (Translated English) | Method for chemical analysis of precious metal alloys - Part 2: Determination of silver content | | Sector / Industry | National Standard (Recommended) | | Date of Implementation | 2026-03-01 | | Older Standard (superseded by this standard) | GB/T 15072.2-2008, GB/T 15072.5-2008 | GB/T 15072.2-2008: Test method of precious metal alloys -- Determination of silver contents for silver alloys -- Potentiometer titration with sodium chloride
---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.
Test method of precious metal alloys.Determination of silver contents for silver alloys.Potentionmeter titration with sodium chloride
ICS 77.120.99
H68
National Standards of People's Republic of China
Replacing GB/T 15072.2-1994
Precious metal alloys -
Determination of the amount of silver in silver alloys
Potentiometric titration with sodium chloride
Posted 2008-03-31
2008-09-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard is GB/T 15072-1994 "precious metals and their alloys -" (all parts) the integration of amendments into
Part 19.
Determination --- GB/T 15072.1-2008 Methods for chemical analysis of precious metal alloys of gold, platinum, palladium, gold alloy amount of ferrous sulfate
Potentiometric titration;
--- GB/T 15072.2-2008 Methods for chemical analysis of precious metal alloys silver alloys Determination of silver content of sodium chloride potential drop
Titration;
--- GB/T 15072.3-2008 Methods for chemical analysis of precious metal alloys of gold, platinum, palladium, platinum alloys determining the amount of potassium permanganate
Current titration;
--- GB /15072.4-2008 Methods for chemical analysis of precious metal alloys of palladium, silver-palladium alloy determining the amount of T-dimethyl glyoxal
Gravimetric method;
--- GB/T 15072.5-2008 Methods for chemical analysis of precious metal alloys of gold, measuring the potential of potassium iodide palladium alloy of silver content drops
Titration;
--- GB/T 15072.6-2008 precious metal alloys - Determination of platinum, palladium, iridium alloy in determining the amount of ferrous sulfate Current
titration;
--- GB/T 15072.7-2008 precious metal alloys - Gold alloys chromium and iron content - Inductively coupled plasma
Plasma atomic emission spectrometry;
--- GB/T 15072.8-2008 precious metal alloys - gold, palladium, silver and copper alloys - Determination of the amount of precipitation thiourea
EDTA complexometric back titration;
--- GB/T 15072.9-2008 precious metal alloys - Gold alloys - Determination of the amount of indium by EDTA back drop
Titration;
--- GB/T 15072.10-2008 precious metal alloys - Gold alloys - Determination of nickel by EDTA back drop
Titration;
--- GB/T 15072.11-2008 precious metal alloys - gold alloy of gadolinium and beryllium content - Inductively coupled plasma
Plasma atomic emission spectrometry;
--- GB T 15072.12-2008 precious metal alloys - Silver alloys - Determination of vanadium content/hydrogen peroxide spectrophotometer
Law degree;
--- GB/T 15072.13-2008 precious metal alloys - Tin in silver, cerium and lanthanum content - Inductively coupled
Plasma atomic emission spectrometry;
--- GB/T 15072.14-2008 precious metal alloys - silver alloy of aluminum and nickel content - Inductively coupled plasma
Plasma atomic emission spectrometry;
--- GB T 15072.15-2008 precious metal alloys - gold, silver, palladium alloy of nickel, zinc and manganese contents /
Inductively coupled plasma atomic emission spectrometry;
--- GB/T 15072.16-2008 precious metal alloys - gold alloy of copper and manganese content - Inductively coupled plasma
Plasma atomic emission spectrometry;
--- GB/T 15072.17-2008 precious metal alloys - Determination of tungsten content of a platinum alloy of tungsten trioxide weight
Method;
--- GB/T 15072.18-2008 precious metal alloys - Gold alloys of zirconium and gallium content - Inductively coupled plasma
Plasma atomic emission spectrometry;
--- GB/T 15072.19-2008 precious metal alloys - silver vanadium alloys and magnesium content - Inductively coupled plasma
Plasma atomic emission spectrometry.
This section GB/T 15072-2008 Part 2.
This Part replaces GB/T 15072.2-1994 "precious metals and their alloys - Silver alloys Determination of silver content."
This section compared with the GB/T 15072.2-1994, have the following main changes.
--- Standard name by the GB/T 15072.2-1994 "precious metals and their alloys - Silver alloys - Determination of the amount of silver" change
More "precious metal alloys - Determination of silver alloy silver amount of sodium chloride by potentiometric titration."
--- The new standard requires the preparation of solution preparation, concentration and other representation were revised.
--- Original standard range AgCu10, AgCu12.5, AgCuNiAl20-2.0-1.0, AgCuV10-0.2, AgCe0.5 modify oriented
Standard applies to AgCu, AgCuZnMnNi, AgCuNiAl, AgCuV, AgCuZnSn, AgSnCeLa, AgCe, AgMg-
Ni alloys - Determination of silver content. Measurement range (mass fraction). 50% to 99.5%.
--- According to GB/T 20001.4-2001 format requirements rewritten.
Appendix A of this section is an informative annex.
This part is proposed by the China Nonferrous Metals Industry Association.
The non-ferrous metal part by the National Standardization Technical Committee.
This section is your research Platinum Ltd. is responsible for drafting.
The main drafters of this section. Luo Yijiang, race Xiang Tao, Yang Yuanyuan.
This part of the standard replaces the previous editions are.
--- GB/T 15072.2-1994.
Precious metal alloys -
Determination of the amount of silver in silver alloys
Potentiometric titration with sodium chloride
1 Scope
This section provides the determination of silver alloy silver content.
This section applies to AgCu, AgCuZnMnNi, AgCuNiAl, AgCuV, AgCuZnSn, AgSnCeLa, AgCe, AgMgNi
Determination of silver content alloys. Measurement range (mass fraction). 50% to 99.5%.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this part. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this section, however, encourage the parties to this part of the research agreement
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this section.
371 precious metal alloys - General rules and regulations YS/T
3 Method summary
Sample was dissolved in nitric acid. In nitric acid medium, a silver electrode as indicator electrode, a silver - silver iodide electrode as the reference electrode, with sodium chloride standard
Silver titration titration, potentiometric method indicates the end.
4 Reagents and materials
Unless otherwise indicated, all reagents shall conform YS/T 371 standard.
4.1 nitrate (ρ1.42g/mL), pure class distinctions.
4.2 silver standard solution.
Weighed 2.0000g of metallic silver (silver content of not less than 99.99%), accurate to 0.00001g, placed in 250mL beaker,
Plus 40mL of nitric acid (1 + 1, pure class distinctions), cover the surface of the pan, heat until completely dissolved, in time to make the nitrogen oxides, removed, cooled to room temperature. Water
Rinse the beaker and watch glass wall, the brown solution was transferred into 1000mL volumetric flask, diluted with water to the mark. Mix well. This solution containing 1mL
2.000mg silver stored.
4.3 sodium chloride standard titration solution [Ba (NaCl) about 0.020mol/L]
4.3.1 preparation.
Weigh 1.169g sodium chloride (excellent pure), dissolved in water and diluted to 1000mL, and mix.
4.3.2 Calibration.
Pipette 25.00mL standard solution of silver in 100mL beaker, silver insertion indicator electrode, a silver - silver iodide reference electrode, electromagnetic stirring start
Stirrer with sodium chloride standard titration solution, titration to the maximum potential jump is the end. Sodium chloride Standard Solution Calibration parallel consumed
Poor shall not exceed the volume of 0.05mL, averaged.
According to equation (1) to calculate the actual concentration of sodium chloride standard titration solution.
Ba Ba = 0
· Vp 1 × 10-3
107.87 × Vp 2
(1)
Where.
Ba --- the actual concentration of sodium chloride standard titration solution, expressed in moles per liter (mol/L);
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