METHODS AND OBJECTS OF CHEMICAL ANALYSIS ISSN title: "Metody i obʺekty himičeskogo analiza" An international journal devoted to all aspects of Analytical chemistry ISSN 2413-6166 (Online), ISSN 1991-0290 (Print)
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Optimization of parameters of the measurement and estimation to accuracy of the determination gamma-active radionuclides in soils by method gamma spectroscopy

A.N. ZACHARIA, A.S. ZHURAVLEV, V.V. KALINCHAK, A.S. CHERNENKO, A.N. CHEBOTAREV, M.V. ARABADZHI

This paper presents the model of the heating rate electrothermal graphite tube furnace, including graphite «filter-furnace» atomizer «GRAPHITE-2», as well as the appropriate operating parameters of the ET AAS de-termination Pb and Cd. It is shown that the use of a graphite «filter-furnace» atomizer provides a ~ 2.0-2.5 fold improve the sensitivity of determination Pb and Cd, increase the temperature at pyrolisis stage by ~ 100 – 150 0C, as well as completely eliminate interference effects including background absorbance by the presence in analyzed solutions of 0.5 g∙dm-3 NaCl, Na2SO4, CaCl2, MgSO4. As the result, simple and effective method for the direct ET AAS determination of ≥ 0.0015; 00001 mg·dm-3 Pb and Cd respec-tively, in natural waters are proposed. The relative standard deviation (Sr) does not exceed 7%.

Keywords: model of heating furnace, graphite «filter-furnace», palladium, cadmium, atomic absorption spectrophotometry, natural waters

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