GB/T 15072.9-2008Test method of precious metal alloys - Determination of indium content for gold alloys - Complexometric return titration using EDTA (English PDF)
贵金属合金化学分析方法 金合金中铟量的测定 EDTA络合返滴定法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
March 31, 2008
Implementation date
September 1, 2008
Scope
GB/T 15072.9-2008 is the English-translated version of 贵金属合金化学分析方法 金合金中铟量的测定 EDTA络合返滴定法.
GB/T 15072.9-2008 is the Chinese standard "Test method of precious metal alloys - Determination of indium content for gold alloys - Complexometric return titration using EDTA".
Its scope clause reads: This section provides the determination of gold alloys indium content. This section applies to the determination AuNiIn alloy indium content.
Measurement range (mass fraction). 7% to 10%. Its clauses include method summary; reagents and materials.
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Document preview — GB/T 15072.9-2008
National Standard of the People's Republic of China
- ICS
- 77.120.99
- Classification
- H 68
- Replacing
- GB/T 15072.9-1994
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 Normative references
- 3 Method summary
- 4 Reagents and materials
1 Scope
This section provides the determination of gold alloys indium content.
This section applies to the determination AuNiIn alloy indium content. Measurement range (mass fraction). 7% to 10%.
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 a mixed acid, hydrochloric acid and nitric acid. Sulfite reduction and separation of gold, dimethyl glyoxal oxime ethanol precipitation separation of nickel is added
Excess edetate disodium (EDTA) solution and indium complexed with xylenol orange as indicator, titrate with lead standard solution back titration, measuring
Given the amount of indium.
4 Reagents and materials
Unless otherwise noted, reagents and vessels shall comply with YS/T 371 standard.
4.1
crystalline sodium acetate (CH3COONa · 8H2O).
4.2
Glacial acetic acid (rho1.05g/mL).
4.3
hydrochloride (rho1.19g/mL).
Nitrate 4.4 (rho1.42g/mL).
4.5
sulfite (rho1.03g/mL).
4.6
Ammonia (rho0.90g/mL).
4.7
ammonia solution (1 + 1).
4.8
ammonia solution (99 + 1).
4.9
hydrochloric acid solution (1 + 1).
Mixing hydrochloric acid and nitric acid 4.10. 3 per unit volume of hydrochloric acid (4.3) and 1 unit volume of nitric acid (4.4) is mixed with a time of existing service.
4.11
tartaric acid solution (500g/L).
4.12
sodium chloride solution (100g/L).
4.13
ammonium chloride solution (250g/L).
4.14
glyoxal oxime dimethyl ethanol solution (15g/L).
4.15
acetic acid - sodium acetate buffer solution (pH5.8). Weigh 100g crystallized sodium acetate (4.1), add 4.5mL glacial acetic acid (4.2), dilute with water
Diluted to 500mL.
4.16 disodium edetate [Na2EDTA · 2H2O (abbreviated
EDTA)] solution (about 0.01mol/L).
4.17 Indium standard solution
Weigh 0.100g metal indium (indium content of not less than 99.99%), accurate to 0.0001g, placed […]
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Similar standards
Editions of GB/T 15072.9
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 15072.9-2008 | Test method of precious metal alloys - Determination of indium content for gold alloys - Complexometric return titration using EDTA | current edition | Current |
| GB/T 15072.9-1994 | Test method of precious metal alloys - Determination of indium content for gold alloys - Complexometric return titration using EDTA | previous edition | Superseded |
This page sells the current edition, GB/T 15072.9-2008. Earlier editions are listed for reference only.
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Related Standards
GB/T 15072.10-2008 — Test method of precious metal alloys - Determination of nickel content for gold alloys - Complexometric backing titration using EDTA
GB/T 15072.8-1994 — Gold, Palladium and silver alloys-Determination of copper content
GB/T 15072.10-1994 — Gold alloys-Determination of nickel content
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