| Abstract [eng] |
Stable Sulfur Isotopes Measurement This work describes sulfur cycle in the atmosphere, sulfur exchanges in biological processes, influence of sulfur compounds to atmospheric aerosol formation, sulfur aerosol impact on climate. The main aim of this work was to practice sulfur isotope ratio measurement methodology of environmental samples, by transferring sulfur from environmental oxides and sulfuric acid to the form of barium sulfate. Main objectives were: to collect atmospheric transport forecast, and to collect aerosol samples according to those forecasts; measure the sulfur isotope ratio of barium sulfate and sulfuric acid; measure the sulfur isotope ratio of barium sulfate to assess the influence of the catalyst used in sulfur isotope ratio measurement. It was found that sulfur isotope ratios can be measured in organic samples without using a catalyst. It is difficult to measure sulfur isotope ratios in BaSO4 because of its difficult combustion, and therefore it is necessary to use a catalyst, for example V2O5. Measured sulfur isotope ratio values of the sulfuric acid and commercially available barium sulfate were: δ34S = 9.6 ± 0.7 ‰ (sulfuric acid), δ34S = 14.9 ± 0.3 ‰ (barium sulfate). Different isotope ratio values indicate that the origin of sulfur in said materials is different. In order to measure the sulfur isotope ratio of sulfates of aerosol particles it is required to transfer sulfates to the form barium sulfate. This work lays out the conditions under which you can measure the sulfur isotope ratio of barium sulfate, which can be made from sulfur in aerosol particles. |
