Using square wave cathodic stripping voltammetry on a hanging mercury drop electrode, selenium(+4) was measured in rainwater samples and snow melts. The ratio of peak currents, obtained from filtered and nonfiltered fractions of the same sample, could be even three, but standard addition method indicates the same initial concentration in both cases. The influence of filtration is explained in terms of decreased surfactant level. From one of the samples, double peaks of unknown origin were obtained. They reflect two irreversible processes which are not fully independent. Possible explanation includes two modifications of the same deposit, formed during accumulation step. The influence of surfactants and/or other organic compounds on the signal of interest could perhaps be useful in various studies of organic matter, dissolved in rainwater or snow melt. |
All the contents of bib.irb.hr, except where otherwise noted, is licensed under a Creative Commons licence
