GB/T 15072.18-2008Test method of precious metal alloys - Determination of zirconium and gadolinium contents for gold alloys - Inductively coupled plasma atomic emission spectrometry (English PDF)
贵金属合金化学分析方法 金合金中锆和镓量的测定 电感耦合等离子体原子发射光谱法
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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 15072.18-2008 is the English-translated version of 贵金属合金化学分析方法 金合金中锆和镓量的测定 电感耦合等离子体原子发射光谱法.
GB/T 15072.18-2008 is the Chinese standard "Test method of precious metal alloys - Determination of zirconium and gadolinium contents for gold alloys - Inductively coupled plasma atomic emission spectrometry".
Its scope clause reads: This section provides the method of determination of zirconium and gallium in gold alloys. This section applies to AuNiFeZr and AuGa alloy determination of zirconium and gallium content.
Measuring range (mass fraction). 0.1% ~ 2%. Its clauses include method summary; reagents and materials.
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Document preview — GB/T 15072.18-2008
National Standard of the People's Republic of China
- ICS
- 77.120.99
- Classification
- H 68
- Replacing
- GB/T 15072.20-1994
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 method of determination of zirconium and gallium in gold alloys.
This section applies to AuNiFeZr and AuGa alloy determination of zirconium and gallium content. Measuring range (mass fraction). 0.1% ~ 2%.
2 Normative references
The following documents contain provisions which, through reference in this section, become the provisions of this section. All dated references, which are subsequently owned
Amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach an agreement under this section of the parties to study
Whether you can use the latest versions of these files. For undated references, the latest version applies to this section.
YS/T 371 Methods for Chemical Analysis of Precious Metal Alloys and General Provisions
3 method summary
The sample was dissolved with a mixed acid of hydrochloric acid and nitric acid, and the gold was reduced by reduction with sulfurous acid. Inductively coupled plasma atomic emission spectrometry (hereinafter referred to as
ICP-AES) to calculate the mass fraction of zirconium and gallium.
4 Reagents and materials
Unless otherwise indicated, the reagents and materials used in this section should be consistent with the provisions of YS/T 371.
4.1
Argon ((Ar) >=99.95%).
4.2
Hydrochloric acid (rho 1.19 g/mL).
4.3
Nitric acid (rho1.42g/mL).
4.4
hydrochloric acid - nitric acid mixed acid (4 +1), when used with the current.
4.5
Hydrochloric acid (1 + 9).
Sulfuric acid (SO2, content of not less than 6%).
4.7 gallium standard stock solution
Weigh 0.1000g of metal gallium ((Ga) >= 99.95%), placed in a 150mL beaker. Add 10 mL
Hydrochloric acid (4.5), cover the surface of the dish, low temperature heating until dissolved completely. Cool to room temperature, transfer to 100 mL volumetric flask with hydrochloric acid (4.5) and dilute
Release to the mark. Mix well. This solution 1 mL contains 1.000 mg gallium.
4.8 zirconium standard stock solution
4.8.1 Preparation
Weigh 3.532g zirconyl chloride (ZrOCl2 · 8H2O), placed in 250mL beaker, add 50mL hydrochloric acid (4.5),
Dissolved completely into the.200mL volumetric flask, diluted with water to the mark. Mix well. This solution 1 mL contains 5 mg zirconium.
4.8.2 Calibration
Pipette 10.00mL zirconium standard stock solution (4.8.1) in 400mL beaker, add 40mL hydrochloric acid (4.2) and
100mL water, heated to near boiling. Add 50mL of mandelic acid (150g/L) with stirring and stir until the precipitate is precipitated.
90 °C insulation 0.5h. Stand for more than 4h. Slow filter paper filtration. With hot wash solution (per liter of solution containing 20g mandelic acid, 20mL salt
Acid (4.2)) for 7-8 times. The precipitate, together with the filter paper, is placed in a porcelain crucible, which is then ashed, transferred to a high temperature furnace and fired at 1000 ° C for 1 hour. take out crucible. Slightly cold, into the dryer, cooled to room temperature and then weighed. Parallel calibration of three, the difference between the three weighing should not exceed 1.0mg, take
The average.
According to equation (1) calculate the mass concentration of zirconium.
rho0 = (1) […]
......
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 15072.18
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 15072.18-2008 | Test method of precious metal alloys - Determination of zirconium and gadolinium contents for gold alloys - Inductively coupled plasma atomic emission spectrometry | current edition | Current |
| GB/T 15072.20-1994 | Test method of precious metal alloys - Determination of zirconium and gadolinium contents for gold alloys - Inductively coupled plasma atomic emission spectrometry | previous edition | Superseded |
This page sells the current edition, GB/T 15072.18-2008. Earlier editions are listed for reference only.
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