Home – Home – Jornals – Chemistry for Sustainable Development 2019 number 4

For the purpose of analytical application of thiopyrine in the analysis of the natural samples - the solid components of snow and the filtrate of surface river water, an equimolar melt of thiopyrinium salicylate with the melting point 145 °C was obtained, and its physicochemical properties were studied. The melt was used to extract the sorbed inorganic forms of copper, cadmium, lead, and zinc from the solid particles of snow cores sampled at the territory of Barnaul. The resulting extracts and acid mineralizates were analyzed by means of flame atomic absorption spectrometry. Analysis of the concentrations of chalcophilic metals under investigation allowed us to determine the total content of the sorbed forms and the mass concentration of inorganic forms of copper, cadmium, lead, and zinc in the solid particles from snow at the stage of sample preparation. The variation ranges for the mass concentrations of the inorganic forms were 50-94 % for copper, 58-95 % for cadmium, 68-89 % for lead, 74-89 % for zinc. The mass concentrations of organic forms were calculated from the difference between the amounts of Cu, Cd, Pb, Zn in the acid mineralizate and in the extract. The filtrates of river water were preserved with hydrochloric acid and studied separately with the help of layering in situ in the system of water (≥ 0.01М HCl) - thiopyrinium salicylate - modifier to form two liquid phases. The lower and upper phases were analyzed for the concentrations of Cu, Cd, Pb, Zn by means of stripping voltammetry. The degree of extraction of the ionic forms of copper (II), cadmium (II), lead (II) and zinc (II) from the samples of river water filtrate after single extraction was (92 ± 2), (90 ± 3), (94 ± 2), (97 ±1) %, respectively.