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GB/T 9288-2019: Gold jewellery alloys - Determination of gold - Cupellation method (fire assay)
Status: Valid GB/T 9288: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 9288-2019 | English | 264 |
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Gold jewellery alloys - Determination of gold - Cupellation method (fire assay)
| Valid |
GB/T 9288-2019
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| GB/T 9288-2006 | English | 439 |
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Gold jewellery alloys -- Determination of gold -- Cupellation method (fire assay)
| Obsolete |
GB/T 9288-2006
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| GB/T 9288-1998 | English | 239 |
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Analyse method of gold content in jewellery
| Obsolete |
GB/T 9288-1998
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| GB/T 9288-1988 | English | RFQ |
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3 days [Need to translate]
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Analyse-method of gold content in jewellery
| Obsolete |
GB/T 9288-1988
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PDF similar to GB/T 9288-2019
Basic data | Standard ID | GB/T 9288-2019 (GB/T9288-2019) | | Description (Translated English) | Gold jewellery alloys - Determination of gold - Cupellation method (fire assay) | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Y88 | | Classification of International Standard | 39.060 | | Word Count Estimation | 14,122 | | Date of Issue | 2019-10-18 | | Date of Implementation | 2020-05-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 9288-2019: Gold jewellery alloys - Determination of gold - Cupellation method (fire assay)---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.
Gold jewellery alloys--Determination of gold--Cupellation method(fire assay)
ICS 39.060
Y88
National Standards of People's Republic of China
Replace GB/T 9288-2006
Gold alloy jewellery gold content determination
Ash blowing method (fire test method)
[ISO 11426.2014, Jewelery-Determinationofgoldingoldjewelery
aloys-Cupelationmethod(fireassay), MOD]
Published on.2019-10-17
2020-05-01 implementation
State market supervision and administration
China National Standardization Administration issued
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 9288-2006 "Gold alloy jewelry gold content determination gray blowing method (fire test method)".
Compared with GB/T 9288-2006, the main technical changes of this standard are as follows.
--- Removed the normative reference document GB 11887 (see Chapter 2 of the.2006 edition);
--- Added normative reference document ISO 11596 (see Chapter 2);
--- Revised the requirements for nitric acid (see 5.1, 5.1 and 5.2 of the.2006 edition);
--- Increased sampling requirements (see Chapter 7);
--- Added appropriate health and safety procedures warnings in the test procedure (see 8.1);
--- Increased initial testing requirements (see 8.2);
--- Revised the formula for calculating the gold content of the sample, consistent with ISO 11426.2014 (see Chapter 9).
This standard uses the redrafting method to modify the use of ISO 11426.2014 "jewelry gold alloy jewelry gold content determination gray blowing method
(Fire Test Method).
This standard has more structural adjustments than ISO 11426.2014. Appendix A lists this standard and ISO 11426.2014.
The chapter number is compared to the list.
There are technical differences between this standard and ISO 11426.2014. The terms of these differences have been passed vertically in the blank position on the outside.
The single line (|) is marked, and Appendix B gives a list of the corresponding technical differences and their causes.
This standard also made the following editorial changes.
--- Change the standard name to "Gold Alloy Jewelry Gold Content Determination Gray Blowing Method (Fire Test Method)".
This standard was proposed by the China Light Industry Association.
This standard is under the jurisdiction of the National Jewelry Standardization Technical Committee (SAC/TC256).
This standard was drafted. Beijing Guoshou Jewelry Testing Co., Ltd./National Jewelry Quality Supervision and Inspection Center, Beijing Guoshou Jewelry
Standardization Research Center.
The main drafters of this standard. Li Suqing, Qin Shenghui, Wang Jian, Zhang Teng, Li Yuxi, Gao Juncai, Li Wujun.
The previous versions of the standards replaced by this standard are.
---GB 9288-1988, GB/T 9288-1998, GB/T 9288-2006.
Gold alloy jewellery gold content determination
Ash blowing method (fire test method)
1 Scope
This standard specifies the method for determining the gold content of gold alloy jewellery and related products by the ash blowing method (fire test method).
This standard applies to various gold alloy jewellery and related products with a gold content of 333.0‰~999.5‰ (excluding platinum, hydrazine, etc., insoluble in nitric acid
The composition of the gold content.
This standard is designated by GB 11887 as the arbitration method for the analysis of gold content in gold alloy jewellery and related products.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
ISO 11596 Sampling of precious metal alloy jewellery and related products (Jewelery-Samplingofpreciousmetalal-
Loysforandinjeweleryandassociatedproducts)
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Ash blowing cupelation
The gold and/or silver containing the impurity metal is melted in a high-temperature furnace ash dish (a flat-bottomed porous disk made of refractory or high-temperature resistant material),
The process of blowing off the hot air stream over it to separate the impurities is then carried out. Lead, copper, tin and other metal impurities to be separated by hot air oxygen
It is partially evaporated and partially absorbed by the ash dish.
3.2
Gold partingofgold
The silver in the gold-silver alloy particles after the ash blowing is dissolved with nitric acid to realize the process of gold and silver separation.
4 Principle of the method
A suitable amount of silver was added to the sample in proportion, and lead was used as a buffering agent, and placed in a porous ash dish for ash ash blowing. Lead oxides and impurities are
The ash dish is absorbed, while the gold and silver are retained in a ash dish and smelted into gold and silver alloy particles (precious metal beads). Roll it into thin slices and roll them into small rolls, placed in nitric acid
In the middle, the silver is gradually dissolved to obtain the quality of the gold. At the same time, the standard gold is used for analysis and comparison, which can eliminate the systematic error in the analysis process.
5 reagent materials
5.1 Nitric acid, mass fraction of 65% to 68%, does not contain halides.
5.2 Lead foil, free of precious metals and antimony.
The lead pellets are melted and cast into 0.2mm thick lead foil, and the oil is wiped off for use.
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