Results 1 - 2 of 2
Results 1 - 2 of 2. Search took: 0.016 seconds
|Sort by: date | relevance|
[en] Complete text of publication follows. This topic involves the determination of Pt and Pd content of precious metal-bearing rocks (from the Sudbury magmatic complex) by inductively coupled plasma spectrometric methods. Altogether 9 samples were available for the comparison of recoveries by lead fire assay and decomposition by aqua regia. The standard analytical method for the determination of platinum group elements in the Laboratory of GIH is ICP-OES and ICP-MS analysis after aqua regia decomposition. The matrix was very heavy, up to 35% in Cu; 30% in Fe and 3% in Ni. A JY ULTIMA 2C ICP-OES instrument was used for the determination of Pt and Pd content from the aqua regia solution. Although this instrument has a very good spectral resolution (5 pm), the straight analysis is not easy in a complicated, line-rich matrix. The background positions were changing at most of the samples, therefore graphical evaluation was the best for subtracting the proper background values. Several analytical lines were used for the determination of Pt and Pd. The Pt and Pd contents were also analysed by ICP-MS (Perkin-Elmer ELAN DRC II) on different isotopes. The different Pd isotopes supplied different concentrations indicating that spectral overlaps made the strait analysis very difficult and uncertain. There was a possibility within a bilateral scientific cooperation with the South Vietnam Geological Mapping Division of Analysis and Experiment (Ho Chi Minh City) to complete lead fire assay procedures from these samples. After dissolving the silver prill at the end of the procedure the ICP-OES and the ICP-MS analysis were performed again from the relatively matrix-free solutions. The results of the 2 decompositions were compared.
[en] In this project we have researched and evaluated the separation possibility of uranium ore in Palua area. Although scale and expenses of the project are limited, we have carried out this project during a year and had some reliable results. Uranium ore in Palua area which has concentrate of 440 ppm was separated into two main ingredients containing uranium concentrate more than 550 ppm and less than 190 ppm. (author)