Studies on distribution of trace gold mostly focus on some samples in whichgold content is well above 100 ppm at the present time due to the limitation of analy-sis methods. Progress in research on trace gold (usually...Studies on distribution of trace gold mostly focus on some samples in whichgold content is well above 100 ppm at the present time due to the limitation of analy-sis methods. Progress in research on trace gold (usually less than 100 ppm to n ppm)was rarely reported. Although electronic microprobe (EMP) and scanning electronicmicroprobe (SEM) have a high resolution, their detection limits are still 100-500ppm and 100-300 ppm, respectively. And also the electronic paramagnetic reso-nance spectrometer, an effective method for determining lattice gold of a few tenppm level, unfortunately is still incapable of doing such research. Newly展开更多
In the ores of low-grade platinum deposits, the platinum concentration is very low(average Pt content 【1 μg. g<sup>-1</sup>), and the platinum minerals often occur as micron grains,thus making it difficu...In the ores of low-grade platinum deposits, the platinum concentration is very low(average Pt content 【1 μg. g<sup>-1</sup>), and the platinum minerals often occur as micron grains,thus making it difficult to study the platinum distribution oniy by routine tools, such aselectron microprobes or optic microscopes. As a result, the research and exploitation ofthese deposits in our country is hampered by the lack of more powerful tools.展开更多
In order to develop new reference materials for microanalytical nuclear techniques, scanning proton microprobe (SPM) technique was used to determine homogeneity level within 100×200 μm 2 micro area on the small ...In order to develop new reference materials for microanalytical nuclear techniques, scanning proton microprobe (SPM) technique was used to determine homogeneity level within 100×200 μm 2 micro area on the small pieces of IAEA urban dust reference materials. The experimental methods were described in detail. The results show that IAEA 396A/M Vienna urban dust is homogeneous enough for small sample analysis of standard reference material (SRM).展开更多
文摘Studies on distribution of trace gold mostly focus on some samples in whichgold content is well above 100 ppm at the present time due to the limitation of analy-sis methods. Progress in research on trace gold (usually less than 100 ppm to n ppm)was rarely reported. Although electronic microprobe (EMP) and scanning electronicmicroprobe (SEM) have a high resolution, their detection limits are still 100-500ppm and 100-300 ppm, respectively. And also the electronic paramagnetic reso-nance spectrometer, an effective method for determining lattice gold of a few tenppm level, unfortunately is still incapable of doing such research. Newly
基金Project supported by the National Natural Science Foundation of Chinathe Mountain-Climbing Project of the State Commission of Science and Technology
文摘In the ores of low-grade platinum deposits, the platinum concentration is very low(average Pt content 【1 μg. g<sup>-1</sup>), and the platinum minerals often occur as micron grains,thus making it difficult to study the platinum distribution oniy by routine tools, such aselectron microprobes or optic microscopes. As a result, the research and exploitation ofthese deposits in our country is hampered by the lack of more powerful tools.
文摘In order to develop new reference materials for microanalytical nuclear techniques, scanning proton microprobe (SPM) technique was used to determine homogeneity level within 100×200 μm 2 micro area on the small pieces of IAEA urban dust reference materials. The experimental methods were described in detail. The results show that IAEA 396A/M Vienna urban dust is homogeneous enough for small sample analysis of standard reference material (SRM).
