engleski

Application of electrochemical methods in the physico-chemical characterization of atmospheric precipitation

Electrochemical methods play an important role in the environmenal analysis. This study demonstrates that electrochemical (voltammetric) methods are a valuable tool with good selectivity and sensitivity for physico- chemical analysis of atmospheric precipitation. Studies have been done with daily bulk samples collected in the city of Zagreb (Croatia) in the period of 2009/2010. Heavy metal (HM) content and reduced sulfur species (RSS) were investigated in the precipitation samples by using cathodic striping voltammetry (CSV) and differential pulse striping voltammetry: anodic, DPASV (Zn, Cd, Pb and Cu) and adsorptive cathodic modes, DPAdCSV (Ni), respectively, at the hanging mercury drop electrode. In average, the highest concentrations were found for Zn and the lowest for Cd (Cd < Ni < Pb < Cu < Zn). Although generaly low correlations between metals was found (statistically significant was only between Zn and Cu), the same pattern of concentration changes relative to precipitation events were observed for Zn, Cd, Pb, Cu and DOC, whereas an oposite pattern was noticed for Ni and pH. Analyses of bulk samples by CSV tecnique revealed an existance of different sulfur species, providing an exelent tool for study of organic and inorganic RSS in the atmospheric precipitation at nano-levels.

Voltammetric techniques ; Atmospheric precipitation ; Heavy metals ; Reduced sulfur species

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