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Methods for chemical analysis of precious metal alloys - Part 20: Determination of rhodium content
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| GB/T 15072.20-1994 | English | 199 |
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Gold alloys-Determination of zirconium content
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Basic data | Standard ID | GB/T 15072.20-2025 (GB/T15072.20-2025) | | Description (Translated English) | Methods for chemical analysis of precious metal alloys - Part 20: Determination of rhodium content | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H15 | | Classification of International Standard | 77.120.99 | | Word Count Estimation | 16,118 | | Date of Issue | 2025-08-29 | | Date of Implementation | 2026-03-01 | | Issuing agency(ies) | State Administration for Market Regulation; Standardization Administration of China | GB/T 15072.20-2025: Methods for chemical analysis of precious metal alloys - Part 20: Determination of rhodium content
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ICS 77.120.99
CCSH15
National Standards of the People's Republic of China
Chemical Analysis Methods for Precious Metal Alloys
Part 20.Determination of Rhodium Content
Published on 2025-08-29
Implemented on 2026-03-01
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Foreword
This document is in accordance with GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents".
Drafting is scheduled.
This document is Part 20 of GB/T 15072 "Chemical Analysis Methods for Noble Metal Alloys". GB/T 15072 has been published in the following parts.
Parts.
---Part 1.Determination of Gold Content;
---Part 2.Determination of Silver Content;
---Part 3.Determination of Platinum Content;
---Part 4.Determination of Palladium Content;
---Part 6.Determination of Iridium Content;
---Part 7.Determination of Chromium and Iron Contents in Gold Alloys by Inductively Coupled Plasma Atomic Emission Spectrometry;
---Part 8.Determination of Copper Content in Gold, Palladium, and Silver Alloys. Thiourea Precipitation EDTA Complexometric Back Titration;
---Part 9.Determination of Indium Content in Gold Alloys by EDTA Complexometric Back Titration;
---Part 10.Determination of Nickel Content in Gold Alloys by EDTA Complexometric Back Titration;
---Part 11.Determination of Hormone and Beryllium Contents in Gold Alloys by Inductively Coupled Plasma Atomic Emission Spectrometry;
---Part 12.Determination of Vanadium Content in Silver Alloys by Hydrogen Peroxide Spectrophotometry;
---Part 13.Determination of Tin, Cerium and Lanthanum in Silver Alloys by Inductively Coupled Plasma Atomic Emission Spectrometry;
---Part 14.Determination of Aluminum and Nickel Contents in Silver Alloys by Inductively Coupled Plasma Atomic Emission Spectrometry;
---Part 15.Determination of Nickel, Zinc and Manganese Contents in Gold, Silver and Palladium Alloys by Inductively Coupled Plasma Atomic Emission Spectrometry;
---Part 16.Determination of Copper and Manganese Contents in Gold Alloys by Inductively Coupled Plasma Atomic Emission Spectrometry;
---Part 17.Determination of Tungsten Content in Platinum Alloys by Tungsten Trioxide Gravimetric Method;
---Part 18.Determination of Zirconium and Gallium Contents in Gold Alloys by Inductively Coupled Plasma Atomic Emission Spectrometry;
---Part 19.Determination of Vanadium and Magnesium Contents in Silver Alloys by Inductively Coupled Plasma Atomic Emission Spectrometry;
---Part 20.Determination of Rhodium Content
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed by the China Nonferrous Metals Industry Association.
This document is under the jurisdiction of the National Technical Committee on Standardization of Nonferrous Metals (SAC/TC243).
This document was drafted by. Guizhou Research & Testing Technology (Yunnan) Co., Ltd., Jinchuan Group Co., Ltd., and Guizhou Research Resources (Yimen) Co., Ltd.
Company, Jiangxi Junxin Precious Metals Technology Materials Co., Ltd., Shandong Mengjinyuan Jewelry Co., Ltd., Yunnan Gold Mining Group Precious Metals Inspection
Testing & Certification Co., Ltd., National Standard (Beijing) Testing & Certification Co., Ltd., Beijing Mining Testing Technology Co., Ltd., Zijin Mining Group Co., Ltd.
Shandong Zhongjin Lingnan Copper Industry Co., Ltd., Nanjing Municipal Institute of Product Quality Supervision and Inspection (Nanjing Municipal Institute of Quality Development and Advanced Technology Application Research)
Yunnan Provincial Institute of Precious Metals, Yunnan Provincial Precious Metals Laboratory Co., Ltd., Yunnan Provincial Precious Metals New Materials Holding Group Co., Ltd., and Nonferrous Metals Technology and Economic Research Institute
Research Institute Limited Liability Company.
The main drafters of this document are. Zhang Hangbo, Yang Hui, Zhao Zhenhao, Xiang Lei, Liu Guoqi, Ma Wangrui, Yu Fengshan, Wang Guoxin, Chen Xiaoke, and Li Na.
Ren Chenyang, Lai Qiuxiang, Wang Huaying, Yuan Lili, Gao Ruifeng, Peng Yiran, Zu Yuwei, Chen Lihua, Chen Neng, Wang Zegang, Feng Yanbo, Sun Haifeng
Lin Cuifang, Cao Xiaoyong, Jin Yaqiu, Han Jibiao, Yang Fan, Li Li, Yu Lei, Li Qiuying, Fang Haiyan, Luo Jingdi, Zhu Wuxun.
introduction
Precious metal alloys are alloy materials composed of one or more precious metals (such as gold, silver, platinum, palladium, etc.) and other metallic or non-metallic elements.
These alloys not only retain the excellent properties of precious metals, such as corrosion resistance, electrical conductivity, and ductility, but can also be modified by adding other metals.
Modifying or enhancing certain physical, chemical, or mechanical properties of an alloy. This makes precious metal alloys advantageous in improving material utility and reducing costs.
It is of great significance and has wide applications in the automotive industry, electronics and communications, new energy, petrochemicals, weaponry, aerospace, and other fields. GB/T
15072 aims to establish a set of standard methods for chemical composition analysis to meet the needs of the production and trade of precious metal alloy products.
GB/T 15072 is proposed to consist of 19 parts.
---Part 1.Determination of Gold Content. The aim is to establish potentiometric titration and fire assay methods for determining the gold content in precious metal alloys.
Methods of measurement;
---Part 2.Determination of Silver Content. The aim is to establish potentiometric titration and fire assay methods for determining the silver content in precious metal alloys.
Methods of measurement;
---Part 3.Determination of Platinum Content. The aim is to establish a potentiometric titration method for determining the platinum content in noble metal alloys;
---Part 4.Determination of Palladium Content. The aim is to establish gravimetric and titration methods for determining palladium content in noble metal alloys;
---Part 6.Determination of Iridium Content. The aim is to establish a potentiometric titration method for determining the iridium content in noble metal alloys;
---Part 7.Platinum, Palladium, Rhodium, Iridium, Ruthenium, Cobalt, Chromium, Iron, Nickel, Zinc, Copper, Manganese, Gadolinium, Yttrium, Tin, Cerium, Lanthanum, Aluminum, Vanadium, Magnesium, Gallium, Beryllium, Antimony
Determination of zirconium, molybdenum, and titanium content. The aim is to establish an inductively coupled plasma atomic emission spectrometry (ICP-AES) method for determining the content of zirconium, molybdenum, and titanium in noble metal alloys.
Methods for determining elemental content;
---Part 8.Determination of Copper Content. The aim is to establish a titration method for determining the copper content in noble metal alloys;
---Part 9.Determination of Indium and Zirconium Content. The aim is to establish a titration method for determining the indium and zirconium content in noble metal alloys;
---Part 10.Determination of Nickel Content. The aim is to establish methods for determining the nickel content in noble metal alloys using titration and gravimetric methods;
---Part 12.Determination of Vanadium, Rhenium, Gadolinium, and Yttrium Content by Spectrophotometry. The aim is to establish a spectrophotometric method for the determination of precious metal content.
Methods for determining the content of vanadium, rhenium, gadolinium, and yttrium in gold;
---Part 17.Determination of Tungsten Content. The aim is to establish a gravimetric method for determining the tungsten content in noble metal alloys;
---Part 20.Determination of Rhodium Content. The aim is to establish spectrophotometric and gravimetric methods for determining the rhodium content in noble metal alloys.
method;
---Part 21.Determination of Ruthenium Content. The aim is to establish a spectrophotometric method for determining the ruthenium content in noble metal alloys;
---Part 22.Determination of Manganese Content. The aim is to establish a titration method for determining the manganese content in noble metal alloys;
---Part 23.Determination of Cobalt Content. The aim is to establish a titration method for determining the cobalt content in noble metal alloys;
---Part 24.Determination of Tin Content. The aim is to establish a titration method for determining the tin content in noble metal alloys;
---Part 25.Determination of Copper, Manganese, Antimony, and Nickel Content by Flame Atomic Absorption Spectrometry. The aim is to establish a flame atomic absorption spectrometry method.
A method for determining the content of copper, manganese, antimony and nickel in precious metal alloys by spectroscopic method.
---Part 26.Determination of Oxygen, Nitrogen, and Hydrogen Content. The aim is to establish an inert gas melting-infrared absorption/thermal conductivity method for the determination of oxygen, nitrogen, and hydrogen content.
Nitrogen and hydrogen content.
---Part 27.Determination of Carbon Content. The aim is to establish a high-frequency infrared detection method for determining carbon content.
The release of this document further improves the completeness of the standards system, fully covering the product standard requirements in terms of measurement scope, and meeting market needs.
This is of great significance in improving the quality of precious metal alloy products, promoting their production and trade, and expanding application demand.
Chemical Analysis Methods for Precious Metal Alloys
Part 20.Determination of Rhodium Content
Warning---Personnel using this document should have practical experience working in a formal laboratory. This document does not address all possible safety issues.
Users are responsible for taking appropriate safety and health measures and ensuring compliance with relevant national regulations.
1.Scope
This document describes methods for determining the rhodium content in noble metal alloys using the hexaamminecobalt nitrate gravimetric method and spectrophotometry.
The hexaamminecobalt nitrate gravimetric method described in this document is applicable to the determination of rhodium content in precious metal alloys. The determination range (mass fraction) is 5.00%~
95.00%; Spectrophotometry is suitable for determining the rhodium content in platinum-palladium-rhodium alloys, with a determination range (mass fraction) of 3.00% to < 5.00%.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
GB/T 8170 Rules for rounding off numerical values and the representation and determination of limiting values
3.Terms and Definitions
This document does not contain any terms or definitions that need to be defined.
4.Method 1.Gravimetric method of hexaamminecobalt nitrate
4.1 Principle
The sample was digested in a polytetrafluoroethylene digestion vessel or a hard glass sealed tube under high temperature and high pressure with hydrochloric acid and hydrogen peroxide, in a slightly acidic environment containing rhodium chloride complexes.
In a solution, rhodium is precipitated as a double salt by cobalt hexaammine nitrate, and the amount of rhodium is determined by gravimetric method.
4.2 Reagents and Materials
Unless otherwise specified, only reagents confirmed to be of analytical grade and distilled or deionized water or water of equivalent purity shall be used in the analysis.
4.2.1 Sodium nitrite.
4.2.2 Nitric acid. ρ = 1.42 g/mL.
4.2.3 Hydrochloric acid. ρ = 1.19 g/mL.
4.2.4 Anhydrous ethanol. ρ = 0.79 g/mL.
4.2.5 Diethyl ether. ρ = 1.19 g/mL.
4.2.6 Hydrogen peroxide. w=30%.
4.2.7 Crystallization of cobalt hexaammine nitrate. Dissolve 73g of cobalt nitrate in 100mL of water, add 80g of ammonium nitrate, 2g of activated carbon, and 180mL of concentrated...
Ammonia solution. Aerate the solution for 3-4 hours. Add 1300 mL of nitric acid to acidify the water, and heat to approximately 70°C. Filter to remove activated carbon, and then...
Add.200 mL of nitric acid (4.2.2) to the solution, and filter through a No. 3 glass frosted funnel to precipitate an orange crystalline precipitate. Wash the precipitate once with water and ethanol.
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GB/T 15072.20-2025: Methods for chemical analysis of precious metal alloys - Part 20: Determination of rhodium content
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