Abstract
The concentration of heavy metals in natural waters is normally too low for direct speciation studies. For that reason, special techniques are required if one wants to avoid increasing the metal content artificially, thus disturbing the natural surroundings. A new method for studying speciation and complexation has been proposed in a previous paper (K.H. Schrøder, J. Electroanal. Chem., 246 (1988) 15) and the theoretical aspects have been given. This method utilizes hanging drop amalgam voltammetry in conventional or in differential pulse modes. The amalgam is prepared in situ prior to exchanging the medium for the solution to be studied. The present paper gives some experimental verification of the proposed method, by studying the complexation of lead using different experimental parameters.
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