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† * Corresponding author † Odessa I.I.Mechnikov National University, Dvoryanskaya Str., 2,Odessa, 65082 Email: A191047@i.ua Methods Objects Chem. Anal., Volume 9, No 1, 2014 p. 39-49 https://doi.org/10.17721/moca.2014.39-49
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Abstract

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