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Jewelry

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Application Solutions for Testing Industry of Precious Metals

Create Date:2016/7/4 12:47:46  Click:3037

1.Precious metal classification

Precious metal elements: osmium, iridium, ruthenium, rhodium, platinum, palladium, gold, silver.

According to the GB11887-2002 , the jewelries made from precious metals sold in the market can be classified in to 4 types: gold jewelry, silver jewelry, platinum jewelry and palladium jewelry.

1> Gold jewelry

According to the gold content, gold jewelries can be classified into Karat gold jewelry, 99.0% gold jewelry, 99.9% gold jewelry. 1K equals to 100% divided by 24, that is 1K =4.1667%. The theoretical purity of 24K is 100%.
①The gold content of 18K gold jewelry is above 750‰, which can be labeled as 18K or G18K, G750, Au750, gold 18K and gold 750.
②The gold content of 99.0% gold jewelry is not less than 990‰, which can be labeled as 99.0% gold or G990, Au990 and gold 990.
③The gold content of 99.9% gold jewelry is not less than 999‰, which can be labeled as 99.9% gold or G999, Au999 and gold 999. In the market (especially in the overseas market) there are some gold jewelries of 9K (gold content is not less than 375‰), 14K (gold content is not less than 585‰) and 22K (gold content is not less than 916‰).

2> Silver jewelry

common silver jewelries in the market include:
①925 silver: silver content shall not be less than 925‰, the other 75‰ may be copper or anti-oxidants, which can be labeled as S925, or Ag 925 and silver 925.
②99.0% silver: silver content shall not be less than 990‰, which can be labeled as S990 or Ag990 and silver 990. 800 silver (silver content shall not be less than 800‰) can be seen occasionally in the market.

3>Platinum jewelry

Common platinum jewelries in the market include: Pt900, Pt950 and Pt990.
①Pt900, Pt content shall not be less than 900‰, which can be labeled as Pt900 or Platinum 900.
②Pt950, Pt content shall not be less than 950‰, which can be labeled as Pt950 or Platinum 950.
③Pt900, Pt content shall not be less than 990‰, which can be labeled as Pt990 or Platinum 990, 99.0% platinum. Pt850 (platinum content shall not be less than 850‰) and Pt750 (platinum content shall not be less than 750‰) can be seen in the market occasionally.

4>Palladium jewelry

In the past palladium was regarded as blends into the platinum jewelry. Palladium is a new member of precious metal jewelry family.
①Pd950, palladium content shall not be less than 950‰, which can be labeled as Pd950 or palladium 950.
②Pd990, palladium content shall not be less than 990‰, which can be labeled as Pd990 or palladium 990.

2.Application plans of X-ray fluorescence spectrometer for precious metal testing

1>According to GB/T18043-2008 , X-ray fluorescence spectrum can be used in testing surface content of precious metal jewelry and entrusted inspection, and manufacturer internal management. Due to the special circumstances of the jewelries and limitations of methods and principles, X-ray fluorescence spectrometry can be affected by:

  1. major difference in the elemental composition and content of tested samples and reference materials
  2. the tested samples have surface coatings or processed by chemicals
  3. measuring time, shape of samples and measuring area of samples

2>how to improve the measuring accuracy

①Tested samples made into reference materials with the same mend
②Melt the sample evenly and made into tablet for test; as for sample which can’t be melted, polish the surface before test in case that the dirt on the surface affects the testing.
③Operate normatively and prolong the measuring time. Virtual spectrum shall perfectly match with the testing spectrum. As for uneven samples, run the test several times and average the test results.

Instrument Introduction

EDX3000 is developed by Skyray Instrument based on our precious metal testing technology and experience. It is integrated with unique product configurations, testing software with complete functions, and user-friendly operating interface, meeting the requirements for composition testing of precious metals. The human design minimizes adverse effects, making the job of testing various elements easier and satisfying most needs of the customer.

Features

long stable X-ray tube
Semi-conductor silicon electric refrigeration system, instead of liquid nitrogen refrigeration.
Using Skyray Instrument patented product-Signal Noise Enhance (SNE), greatly improving the measuring stability and accuracy of spectrometer.
Built-in high resolution camera, convenient for observing samples at any time.
digital pulse processor, fast and accurate data processing
amplifying circuit
high-low voltage power
single sample chamber, manual instrument cap switch, safe and convenient operation
non-vacuum chamber
triple safety models
multi-variant non-linear regression program
Independent matrix effect correction model
Integral steel structure and elegant appearance
Special software particularly developed, user-friendly operating interface
non-standard samples can be tested accurately as well
high-resolution graphics real-time display, care-free measuring

Technical index

instrument model: EDX3000
scope of measuring elements: from natrium (Na) to uranium (U)
analytical accuracy: 0.05% (above 96%)
analytical scope: 1ppm-99.9%
measuring objects: powder, solids and liquids
working voltage: AC 110V/220V (AC purified stabilivolt power)
analyzing 24 elements simultaneously at one time
energy resolution: (155±5)eV
measuring time: 60-200 seconds
tube voltage: 5-50kV
tube current: 50μA-1000μA
temperature: 15℃-30℃
humidity: 35%-70%
weight: 30KG

Standard configuration

Si-Pin detector
high voltage 5kv-50kv
light pipe 50uA-1000uA
Signal Noise Enhancer
MCA
single sample chamber

Application field

gold, silver, platinum, palladium, copper, zinc and nickel, etc.
electronics and electrical appliances
toys and ceramics
metallurgy and mining industries

Related products

CONTACT US

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400-7102-888
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