CFAN Instrument, easily test "gold doped with rhenium"
Recently, both domestic and foreign customers of our company have discovered the problem of gold doping with rhenium, which has attracted great attention from the market. Rhenium is doped into gold bars and gold ornaments by some criminals through fraudulent schemes. If the existence and specific content of rhenium doped in gold cannot be found in time, it will cause huge irreparable losses to enterprises and individuals.
An introduction to rhenium
Rhenium (Re): atomic number 75, silver-white metal, melting point 3180 ℃, density (21.04g/cm³), density close to gold (19.32g/cm³), is a rare metal.
Analysis of Gold Doping Rhenium Condition
1 Mixed with a small amount of rhenium, the color and hand feel are normal, and it is difficult to identify with the naked eye.
2 The density of rhenium is 21.04g/cm³, which is very close to the density of gold (19.32g/cm³), and the specific content cannot be detected by the water specific gravity method.
3 The price of rhenium is much cheaper than that of gold. Compared with gold, the price of 1 gram of rhenium is about 20RMB, Gold doped with rhenium is highly profitable.
4 When using a spectrometer to detect, it is easy to mistakenly detect rhenium as zinc. This is because the La spectrum of rhenium and the Ka spectrum of zinc almost overlap, so it is easy to mistakenly detect rhenium as zinc.
5 Be vigilant when recovering gold. It needs to be smelted. After smelting, rhenium is deposited on the bottom surface of the gold. In addition, obvious silver-gray particles can be seen on the surface. As shown below:
The situation of rhenium-doping forgery in pure gold in China is relatively common. The following are the peaks and specific content values of rhenium-containing gold nuggets detected by CFAN Instruments XF-A5, as shown in the following figure:
The spectral lines of K gold doped with a small amount of rhenium and zinc at the same time found in overseas Indian customers, as shown below：
It is not difficult to detect the presence of rhenium. At present, most spectroscopic gold detectors on the market use the traditional empirical coefficient method. This method is highly dependent on the standard sample. It can only detect the existence of rhenium doped in gold, but cannot test the specific content of rhenium. If you need to accurately detect the specific content of rhenium doped in gold, you must use an XRF spectrometer using the FP algorithm (basic parameter method).
CFAN model XF-A5/A5SDD instruments all use the unique FP algorithm, which can directly, quickly and accurately detect the specific content of rhenium doped in gold without the need for standard samples, effectively helping customers avoid risks and reduce losses.