Methods for Testing the Purity of Precious Metal Jewelry.pptx

Summary:
Dive into the world of jewelry and discover how to ensure your precious metal pieces are as pure as they seem. This article uncovers the secrets of purity testing for gold, silver, and other precious metals. We explore non-destructive methods that keep your jewelry intact while accurately determining its authenticity and quality.

Key Points:

Non-Destructive Testing: Keep your jewelry looking flawless with tests that don't damage its beauty.
Hydrostatic Method: Plunge into the density world where ethanol, xylene, and carbon tetrachloride help reveal the true nature of your metals.
X-ray Fluorescence (XRF): Uncover the composition with a quick X-ray that's as harmless as it is revealing.
Fire Assay (Cupellation): Watch the transformation as metals are separated in a fiery dance.
ICP Emission Spectroscopy: Peer into the heart of your jewelry with a spectroscope that reads the story of its elements.
Fun Facts:

Did you know you can test jewelry purity with a simple dip in a liquid? It's like giving your jewelry a quick swim test!
X-rays for jewelry? Yep, it's like giving your necklace an MRI without the hospital stay.
Fire and metal? It's not just for blacksmiths; it's a way to purify gold to perfection.

1. Methods for Testing the Purity of Precious Metal Jewelry Get entire article, please visit: https://sobling.jewelry/methods-for-testing-the-purity-of-precious-metal-jewelry/

2. Principles of Testing the Purity of Precious Metal Jewelry Common Detection Methods for Precious Metal Jewelry Quality Hydrostatic Method (Density Method) 01 03 02 04 X-ray Fluorescence Analysis Method (XRF Method) Fire Assay Method (Cupellation Method) 05 06 Inductively Coupled Plasma Emission Spectroscopy (ICP Method) CONTENTS

3. 01 Principles of Testing the Purity of Precious Metal Jewelry

4. Non-destructive testing should be achieved as much as possible. The detection should maintain a certain level of accuracy The detection cost should be as low as possible. Non-Destructive Testing The goals for detecting precious metal jewelry quality are: verifying authenticity and assessing quality.

5. 02 Common Detection Methods for Precious Metal Jewelry Quality

6. Common Detection Methods

7. 03 Hydrostatic Method (Density Method)

8. Density Method The density of impurities in gold jewelry, mainly silver (Ag) and copper (Cu), varies between 8.90 and 10.49 g/cm³.

9. Detection Method

10. Detection Method Infusion Ethanol Xylene Carbon tetrachloride Density /(g/cm 3 ) Temperature /℃ Density / (g/cm 3 ) Temperature /℃ Density /(g/cm 3 ) Temperature /℃ 0.837 7 0.839 6 1.630 3 0.830 16 0.829 16 1.610 13 0.829 18 0.824 22 1.599 18 0.827 19 0.819 27 1.589 23 0.821 21 0.814 32 1.579 28 0.817 26 0.809 37 1.569 33 0.810 32 0.804 42 1.559 38 Densities of Ethanol, Xylene, and Carbon Tetrachloride Immersion Solutions at Different Temperatures

11. 04 X-ray Fluorescence Analysis Method (XRF Method)

12. The basic principles of XRF, including how X- rays interact with the sample to determine elemental composition, are outlined. X-ray Interaction The importance of XRF in jewelry testing for its non- destructive and accurate measurement capabilities is highlighted. Importance in Jewelry Testing Basic Principles of X-ray Fluorescence Analysis

13. Technological Advancements A description of the components of an XRF spectrometer and their roles in the testing process is provided. Components and Their Roles The advancements in XRF technology that have made it a preferred method for testing the purity of precious metals in jewelry are discussed. Structure of X-ray fluorescence spectrometer Structure diagram of the sequential wavelength dispersive X-ray fluorescence spectrometer Schematic diagram of the structure of energy dispersive X-ray fluorescence spectrometer

14. The advantages of using XRF in the jewelry industry, such as speed, accuracy, and non- destructive nature, are detailed. Advantages in Jewelry Industry The limitations and challenges of XRF, including potential sources of error and the need for proper calibration and standard samples, are discussed. Limitations and Challenges Characteristics of X-ray fluorescence spectroscopic analysis

15. Qualitative and Quantitative Analysis Methods of X-ray Fluorescence Spectrometer

16. Affecting the Detection Accuracy of the XRF Method

17. 05 Fire Assay Method (Cupellation Method)

18. Cupellation Method

19. Equipment and utensils used Ash Blowout Furnace

20. Equipment and utensils used Gold Separation Basket Plate-shaped magnesia crucible

21. Analysis Steps of Fire Assay

22. Analysis Steps of Fire Assay Lead Packaging (The numbers in the figure are sample numbers) Aggregate after Ash Melting

23. Analysis Steps of Fire Assay Flattening the alloy particles (The numbers in the figure are sample numbers) Rolling thin sheets Rolling into a cylinder

24. Analysis Steps of Fire Assay Separation using a separation flask and nitric acid  (According to Paolo Battaini , 2013) Gold roll after separation and burning

25. Factors Affecting the Accuracy of Fire Assay Analysis

26. 06 Inductively Coupled Plasma Emission Spectroscopy (ICP Method)

27. ICP Method Working principle diagram of the ICP method

28. ICP Analysis Steps  As an example, the steps include the following analysis of gold content in gold jewelry.

29. ICP Analysis Steps Recommended wavelengths for impurity elements (analytical lines) (Unit: nm) Element Wavelength Other available wavelengths Element Wavelength Other available wavelengths Ag 328.068 338.289 Ni 352.454 231.604 Al 396.152 308.215 Pb 168.220 220.353 As 189.042 193.696 Pd 340.458 355.308 Bi 223.061 306.772 Pt 306.471 203.646 Cd 226.502 228.802 Rh 343.489 - Co 228.616 238.892 Ru 240.272 - Cr 267.716 283.563 Sb 206.833 217.581 Cu 324.754 327.396 Se 196.090 - Fe 259.940 239.563 Sn 189.989 189.927 Ir 215.278 - Te 214.281 - Mg 279.553 280.270 Ti 334.941 - Mn 257.610 260.569 Zn 213. 856 -

30. Factors of Interference in lCP Analysis

31. Factors of Interference in lCP Analysis ICP detection process and corresponding types of interference

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