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Analysis reveals osmium among other platinoids in small plant ash samples, suggesting improved exploration methods.
Biochemical exploration for platinoids offers some advantages over the soil-biochemical method when landscapes of the southern Siberian taiga are investigated. This fact is explained by intense leaching of platinoids from the upper soil horizons and poor reproducibility of analyses of Iithogeochemical samples due to the scarcity of platinoid mineral particles in them. A high-performance scintillation emission spectral analysis is recommended for mass analysis of platinoids from small plant ash samples of about 0.2–1 g. By means of this analysis the presence of platinum and palladium mineral particles of 3–15 μm in size has been established in the plant ash. In addition to high concentrations of these elements, particles of rhodium, iridium and osmium of 3–6 μm in size found beyond the biogeochemical anomalies of platinum particles in the ash of various plants, soils and rocks that have been studied. It has been concluded that the scintillation emission spectral analysis is suitable for revealing intense biogeochemical anomalies of mineral forms of platinoids, but it has insufficient sensitivity to determine their background as well as anomalies of minimum and average intensity. A way to actually improve its sensitivity is registration of small platinum and iridium particles of less than 1 μm in size, which demands special elaboration.
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Kovalevskii et al. (1993) studied this question.
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