The influence of surfactants on the measurements of copper and cadmium speciation in model seawater by differential pulse anodic stripping voltammetry |
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| Authors: | Damir Krznari? |
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| Institution: | Center for Marine Research Zagreb, Rudjer Bo?kovi? Institute, Zagreb, Croatia Yugoslavia |
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| Abstract: | Model systems consisting of a heavy metal ion (Cu2+ or Cd2+), complexing ligand (EDTA or NTA), a surfactant (9,12-octadecadienoic acid, C18H32O2, i.e., linoleic acid), and a surfactant which is at the same time a complexing ligand (tert-octylphenol etoxylate, C8H17(C6H4)(OC2H4)9–10OH, i.e., Triton-X-100) in seawater and NaCl solution were used in order to investigate the influence of the surfactant adsorption (on the electrode surface) on the heavy metal speciation measurements. The samples were titrated with either the metal, complexing ligand or surfactant and were measured by differential pulse anodic stripping voltammetry. It was shown that the surfactant adsorption exerts a strong influence upon the overall metal redox process and, thus, changes considerably both the apparent complexing capacity and the conditional stability constant of the system. Considering the presence of high concentrations of surfactants in polluted seawaters, the danger of measuring the apparent complexing capacity with the anodic stripping voltammetry method, without a detailed knowledge of surfactant properties and influence upon the system, is discussed. |
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