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Surface active substances (SAS) and dissolved organic matter (DOC) in atmospheric precipitation of urban area of Croatia (ZAGREB)

We report measurements of surface active substances (SAS) in atmospheric bulk precipitation on the basis of adsorption characteristics on the mercury electrode by using phase sensitive alternating current voltammetry ( out-of-phase measurement). Samples collected during the 1998-1999 at an urban areaof Croatia. The obtained surfactant activity values were within the range of 0.09-0.37 mg dm-3 eq. Triton-X100. Concentrations of dissolved organic carbon (DOC) in the same samples were in the range of 0.78-4.39 mg dm-3. In this paper, we also used Pb+2 ion as an electrochemical probe for additional characterization of the properties of the organic matter in precipitation, which may be important in various atmospheric processes.

AC voltammetry ; bulk precipitation ; dissolved organic carbon ; surfactants

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