GB/T 28016-2011 English PDF

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GB/T 28016-2011: Gold alloy jewellery -- Determination of gold -- Gravimetric method
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 28016-2011	139	Add to Cart	3 days	Gold alloy jewellery -- Determination of gold -- Gravimetric method	Valid

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Basic data

Standard ID: GB/T 28016-2011 (GB/T28016-2011)
Description (Translated English): Gold alloy jewellery -- Determination of gold -- Gravimetric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: Y88
Classification of International Standard: 39.060
Word Count Estimation: 6,631
Date of Issue: 2011-10-31
Date of Implementation: 2012-02-01
Regulation (derived from): Announcement of Newly Approved National Standards No. 15 of 2011
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 the use of gold jewelery alloys Gravimetric method of gold content. This standard applies to the determination of gold content 700. O �� ~ 999. 5 �� gold alloy jewelry and related products. This standard does not apply to determination containing platinum, palladium, rhodium and other noble metals gold alloy products.

GB/T 28016-2011: Gold alloy jewellery -- Determination of gold -- Gravimetric method

---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 alloy jewellery. Determination of gold. Gravimetric method ICS 39.060 Y88 National Standards of People's Republic of China Determination of gold content of gold jewelery alloys - Gravimetric method Issued on. 2011-10-31 2012-02-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard was drafted in accordance with GB/T 1.1-2009 given rules. Please note that some of the content of this document may involve patents. Distribution of this document Institutions do not assume the responsibility to identify these patents. The standard proposed by China National Light Industry Council. This standard by the National Standardization Technical Committee jewelry (SAC/TC256) centralized. This standard was drafted. Tianjin Institute of Geology Steel Group Co., Ltd. The main drafters of this standard. Wang Hong, Su Xiaohua, Zhang strive. Determination of gold content of gold jewelery alloys - Gravimetric method

1 Scope

This standard specifies the use of gold jewelery alloys - Gravimetric method for gold content. This standard applies to the determination of gold content of 700.0 ‰ ~ 999.5 ‰ gold alloy jewelry and related products. This standard does not apply to the determination of gold alloy products containing platinum, palladium, rhodium and other precious metal elements.

2 principle of the method

Gold alloy sample was dissolved in aqua regia, the metal is converted to elemental state state of the metal compounds, under acidic conditions, the compound with hydrazine hydrate state Gold reduced to elemental gold, and the gold content of the sample by weighing. Reaction is as follows. Au HNO3 4HCl → HAuCl4 NO ↑ 2H2O 2HAuCl4 6N2H4 · H2O → 2Au ↓ 6NH4Cl 3N2 ↑ 2HCl 6H2O

3 Reagents

Unless otherwise indicated in the analysis using only recognized as analytical reagent and secondary distilled water. 3.1 hydrochloride, mass fraction of 36% ~ 38%, ρ = 1.19g/mL. Nitric acid 3.2 mass fraction of 65% ~ 68%, ρ = 1.40g/mL. 3.3 aqua regia, nitric acid (3.2) HCl (3.1) = 13. 3.4 nitric acid, (15). 3.5 hydrazine hydrate.

4 Equipment

4.1 Analytical balance, a sense of the amount of 0.1mg. 4.2 Electric hot plate. 4.3 vacuum pump. 4.4 metal press. 4.5 muffle furnace. 4.6 Quantitative filter paper. 4.7 precision pH test paper. pH4.0 ~ 7.0. 4.8 Buchner funnel. 100mL, 250mL. 4.9 suction bottle. 250mL, 500mL. 4.10 beaker. 250mL, 500mL. 4.11 dryer. 4.12 porcelain crucible. 25mL. ......

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