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Solutions for the Precious Metals Industry
Category ： Solution1
Release time： 2014-03-17 16:35
The national standard GB/T18043 "Non-destructive testing method for precious metal jewelry content, X-ray fluorescence spectroscopy" issued by AQSIQ clearly states that X-fluorescence can be used for non-destructive testing of precious metal content.
At present, the precious metal manufacturing industry has formed a large-scale use of X-fluorescence spectroscopy (XRF) to test precious metal content. The unique advantages of XRF for precious metal detection standards: the product meets the relevant national industry standards and technical standards, and has passed the inspection of relevant inspection agencies such as the Quality Supervision Bureau, and can provide calibration certificates;
Fast: no pretreatment is required for the sample, generally only 20~200 seconds to determine the content of gold, silver, platinum, palladium, etc., which is convenient for the detection of a large number of samples of jewelry;
Precision: ppm-level accuracy, reliable detection data;
Non-destructive: before and after the test, there is no change in the sample in any form;
Intuitive: real-time spectra to visualize precious metals or harmful elements;
Simple: easy to operate, no need for professional testers, no strict test conditions;
Safety: triple protection device to ensure safety;
Economical: The testing process basically does not require any consumables, reducing testing and maintenance costs;
Reliable: Provides a measurement basis for chemical analysis, reducing costs and increasing efficiency.
XRF schematic diagram Screening analysis method of harmful element instruction in jewelry National standard GB/T28021 proposes that atomic absorption spectrophotometer (AAS) and inductively coupled plasma emission spectrometer (ICP) test are used for the determination of harmful elements in jewelry, and a test scheme that can be applied to XRF is provided. The national standard requires that the test article has a variety of products, and such products are in direct contact with human skin. There are five categories of items that are representative. 1: Earrings. 2: Necklaces, bracelets, bracelets, anklets, rings. 3: Watch case, bracelet, buckle. 4: Snaps, buckles, rivets, zippers and metal signage. 5: Jewelry jade, etc.
It can be seen from the above five categories of samples that the first to fourth categories are all made of metal, which can be a precious metal series, a steel series or a coated series. The fifth category can be classified as a non-metallic series.
According to the national standard GB28480, the content of harmful elements in jewelry should be less than or equal to the maximum limit requirements of the corresponding elements in the following table.
|
element |
砷（AS） |
Chromium (Cr hexavalent) |
Mercury (Hg) |
Lead (Pb) |
Cadmium (Cd) |
|
Maximum Limit (ppm) |
1000 |
1000 |
1000 |
100 |
100 |
For jewelry or components that are easy to be swallowed by children, the content of harmful elements should meet the requirements of the above table, and its dissolution amount should also be less than or equal to the maximum limit requirements of the corresponding elements in the following table.
|
element |
Antimony (Sb) |
砷（As） |
Barium (Ba) |
Cadmium (Cd) |
Chromium (Cr) |
Lead (Pb) |
Mercury (Hg) |
硒(Se) |
|
maximum |
60 |
25 |
1000 |
75 |
60 |
90 |
60 |
500 |
According to the national standard GB/T28020, the content of harmful elements in jewelry can be detected by XRF method. After the initial inspection of the X fluorescence spectrometer, we can distinguish between qualified products and unqualified products (that is, products with content lower than or higher than the maximum limit value of 30%), but X fluorescence has a certain application range, it can not test the element valence state, so hexavalent chromium in we test the total chromium content, if the total chromium content does not exceed the standard, then the amount of hexavalent chromium does not exceed the standard, if the total chromium content is determined by XRF to exceed the standard, the quantitative test of hexavalent chromium can be carried out by ultraviolet spectrophotometer. Some suspect products that have been screened by XRF (i.e., products whose content fluctuates around the maximum limit and cannot be determined to qualify and fail must be arbitrated by destructive testing spectroscopic instruments ICP and AAS analysis).
In addition, XRF because it is only the total content of the test element, and can not be tested by the amount of dissolution, we can test whether the total amount of elements exceeds the maximum limit of dissolution through XRF, if it exceeds the maximum limit of dissolution, it must be determined by other spectral analysis testing equipment (such as ICP, AAS) whether the dissolution of the element exceeds the maximum limit, so if you want to solve the harmful element detection solution in jewelry in an all-round way, XRF alone can not do it all, but also carry out other analytical tests, The following figure shows the screening preliminary inspection analysis method of XRF detection of harmful elements in jewelry: 200. XRF non-destructive testing instrument DX-T1 intelligent automatic precious metal detector This product is a new type of high-end tester developed on the basis of many years of precious metal detection technology and experience of Depu Instruments, using a new generation of detectors and multi-channel technology to achieve ultra-high counting rate, 99 second results, accurate analysis of precious metal content. At the same time, it is equipped with a two-dimensional mobile platform and a high-definition industrial camera to achieve accurate positioning of samples. (99.1% gold can be effectively analyzed) fast performance characteristics, 1 second results125, using the industry's most advanced extreme speed detector technology - (X-SDD) resolution as low as <>eV
Advantages: large detection area (area up to 25m㎡), more information received per unit time, good high resolution of counting rate
The detection efficiency of precious metals is higher, the detection signal-to-noise ratio is stronger, and the detection limit is lower
2. Adopt the industry's most advanced digital multichannel technology
Advantages: Effectively improve output efficiency, achieve ultra-high count rate, and ensure that the effective count rate of acquisition exceeds 30WCPS
3. High-power X-ray tube and advanced collimation filter system are adopted
Advantage: Make the excitation efficiency of precious metals higher
4. Optical shutter system
Advantages: Sample exchange does not need to turn off high pressure, improve test efficiency and test accuracy
Sophisticated positioning system
Ultra-high-definition industrial camera, clearer display of test points, multi-point testing, 2D fully automatic mobile sample stage - can realize image linkage control, multi-point continuous testing
Ultra-small sample inspection – down to 0.2 mm
8 kinds of collimators, 4 kinds of filter quick switching function, can be selected according to different samples
Collimators as small as 0.2 mm provide accurate focus detection for ultra-small samples
It can efficiently distinguish between 99.9% and 99.99% gold purity
It can measure harmful elements in precious metals, and the humanized design of lead, cadmium and other humanized designs is safer: X-ray linkage safety device---- optical shutter interacts with the linkage device; The instrument housing is linked to the high-voltage enable terminal
Faster: multi-point testing, where to measure
Schedule warm-up: According to the set time, the instrument can start the test regularly
Appointment to start up function: customers can make an appointment for the instrument to start up, and at the same time, the instrument can be warmed up and automatically detect and correct the instrument status; At the same time, it can realize the appointment shutdown, and the sound and light prompt technical parameters can be set before shutdown: sulfur (S) ~ uranium (U)
Detection limit: The detection limit of analysis can reach 2ppm, and the thinnest can be tested up to 0.005μm
Stability: 0.02%
Elemental content analysis range: 2ppm~99.99%
Detector: X-SDD detector with resolution as low as 125eV
Pipe flow: ≤1000uA
Pipe pressure: 5~50kV
Measurement time: 1s or more (adjustable)
Filters: 4 kinds of filters can be switched freely
Collimator: 8 types of collimator automatic switching
Sample observation: HD industrial camera
Ambient humidity: ≤70%
Ambient temperature: 15°C~30°C
Refrigeration method: electric refrigeration, without any consumables
Input voltage: AC 220V±5V, it is recommended to configure AC purification and stabilized power supply
The instrument is equipped with X-SDD detector digital multichannel analysis system
X-ray source
High and low voltage power supply
Collimator filter system
Precision mobile platform
Optical shutter system
Sample observation system
Electronic control system
Computers and inkjet printers
Application areas
Jewelry processing factory
Gold and silver jewelry store
Precious metal smelters
Quality inspection department
Analytical Test Center
Pawnshop
Precious metal recycling
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FAQ
Can ROHS testing instruments test metal elements?
ROHS detection instrument is a professional equipment used to detect whether electronic components, household appliances, toys and other products contain harmful substances. These harmful substances may pose a long-term threat to humans and the environment, so the application of ROHS detection instruments is of great significance.
The answer to the question of whether ROHS detection instruments can test metal elements is affirmative. Because the scope of ROHS testing not only includes harmful substances, but also includes the detection of metal element components in qualified products. These metal elements include lead, cadmium, mercury, etc., which are widely used in product manufacturing. Although these elements are necessary, excessive use poses great harm to human health and environmental protection. Therefore, the emergence of ROHS detection instruments has brought great convenience to our detection of metal elements.
Which is the best gas chromatograph?
Gas chromatograph is a commonly used analytical instrument, which is widely used in chemistry, biology, medicine and other fields. However, there are many gas chromatograph brands on the market, and the prices are far from the same, making it difficult to choose. So, which gas chromatograph is better?
First of all, we need to understand the basic principles and performance indicators of gas chromatographs. Gas chromatograph uses samples to evaporate into a gaseous state at high temperatures, separate them by column, and then detect the degree and content of different components by detectors. Common performance metrics include resolution, sensitivity, linear range, repeatability, and more.
When choosing a gas chromatograph brand, we can consider the following aspects:
1. Brand awareness and word of mouth. Well-known brands usually have high technical strength and after-sales service guarantee, and have a better reputation.
2. Technological innovation and R&D capabilities. Gas chromatograph technology is constantly updated, and brands with strong R&D capabilities and technological innovation capabilities are more competitive.
3. Product performance and price. The performance and price of different brands of gas chromatographs vary greatly, and you need to choose according to your actual needs and budget.
4. After-sales service and technical support. Various problems may occur during the use of the gas chromatograph, and after-sales service and technical support can solve the problem in time to ensure that the instrument is running.
Which is the best service provider for RoHS spectrometers?
RoHS spectrometer is an instrument used to detect harmful substances in products. It can detect whether products contain lead, mercury, cadmium, Hexavalent chromium and other harmful substances to ensure human health and environmental safety. So, which one is the best service provider for RoHS spectrometers?
Firstly, we need to understand the basic principles and detection methods of RoHS spectrometers. RoHS spectrometer is an instrument based on the principle of spectral analysis, which can determine whether a sample contains harmful substances by analyzing the elements and compounds in the sample. The detection method of RoHS spectrometer is generally X-ray fluorescence spectroscopy (XRF).
What instruments are used to detect RoHS in electronic and electrical products?
RoHS (Restriction of the Use of Certain Hazardous Substances Directive) is a regulation established by the European Union aimed at limiting the content of harmful substances used in electronic and electrical products. These harmful substances include lead, mercury, cadmium, Hexavalent chromium, polybrominated biphenyls and polybrominated diphenyl ethers. To ensure product compliance with RoHS regulations, specific instruments need to be used for testing.
RoHS testing instrument is a device specifically designed to detect the content of harmful substances in electronic and electrical products. These instruments can detect the content of lead, mercury, cadmium, Hexavalent chromium, polybrominated biphenyls, Polybrominated diphenyl ethers and other harmful substances in products. RoHS test instruments are usually tested with X-ray fluorescence (XRF).
What is ROHS testing?
ROHS testing, full name Restriction of Hazardous Substances testing, refers to the testing of the content of specific hazardous substances in electrical and electronic products and wire and cable products to ensure that the products comply with relevant regulations and standards, thereby protecting consumers and the environment from harmful substances.
The origin of ROHS testing can be traced back to the European Union's Restriction of the Use of Certain Hazardous Substances Directive (RoHS Directive) issued in 2003, which requires companies to limit the content of harmful substances such as lead (Pb), mercury (Hg), cadmium (Cd), hexavalent chromium (Cr6+), polybrominated biphenyls (PBB) and polybrominated diphenyl ethers (PBDE) in electrical and electronic products and wire and cable products sold in the European market, and requires enterprises to test the content of their products.
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