Electrochemical Kinetic Measurements and Metal Speciation with the Vibrating Dropping Mercury Electrode
نویسنده
چکیده
The vibrating dropping mercury ele·ctrode (VDME) is applied to the characterization of ionic species and to electroanalytical measurements of metal ion concentrations in water samples strongly polluted with different kinds of surface active substances (SAS). The Cd2+ /CdNTAsystem in citrate buffer solution at pH = 6 was chosen as a model for the effect of a preceeddng homogeneous chemical reaction on the reveraible charge transfer of »free« metal ions. The influence· of Triton-X-100 on the Cd2+ poiarographic wave is a good example of nonionic SAS interference with metal ion charge transfer. The possibilities of the VDME for electrochemical measurements of methylene-blue and iatrorubine in NaCl and KN03 supporting electrolytes are discussed. The VDME with its short drop li.fe time of up to 200 drops/s is more convenient and reliable than other kinds of electrodes for kinetic measurements and for the analysis of samples which are highly polluted by organics.
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