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DETERMINE GOLD KARAT USING XRF. Sawsan Ahmed Elhouri. In this work we used X-ray fluorescence (XRF) technique to analyze gold specimens and also to identify gold karat; which depends on the internal construct of ten homogeneous samples.
Verifying the gold content of karat-gold jew- elry is a problem for the entire industry. This st~~dy compares four widely available testing methods: de~~sity (measured by hydrostatic weighing), chemical reactivily (toz~chstone testing), capocilive decay (Tri-Electronics G-XL-18 Gold Tesler), and X-ray fl~~oracence
In this work we used X-ray fluorescence (XRF) technique to analyze gold specimens and also to identify gold karat; which depends on the internal construct of ten homogeneous samples. Results shows that (XRF) analysis in the region 0.2 A, three layers were observed in XRF spectrum of all gold samples, top layer Au , Ag and Cu with a
Five gold alloys of Karats 18K, 19K, 20K, 22K and 24K having certified composition of gold as 75, 79, 85, 93 and 99.99% were tested and their precise elemental compositions were determined using the laser produced plasma technique.
• Fire assay method for gold determination is an old well known analytical method which is clearly described in ISO 11426-1997. • This method covers the determination of gold in bullion estimated to contain from 0.5‰ up to 999‰ gold. Accuracy and precision of this method is also well known.
The term karat or carat (K or kt) is used as a unit of purity for gold alloys. Karat purity is measured as 24 times the purity by mass: X = 24 M g M m. Where: X is the karat rating of the material, M. is the mass of pure gold or platinum in the material, and. g is the total mass of the. m material.
A conceptual framework for a non-destructive test to check gold content using parallel plate electrical capacitance tomography is being proposed and the simulation process has shown promising results.
