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Croatica Chemica Acta, Vol.85 No.3 October 2012. -

Current minimum, which sometimes appears as a part of the net response in differential pulse polarography DPP, was studied in systems characterized by a pronounced IR drop or reactant adsorption. Experimental results obtained on a static mercury drop electrode SMDE clearly indicate that this effect is highly influenced not only by solution resistance or intentionally added resistors and reactant concentration, but also by both timing parameters drop time, pulse duration and electrode surface area. Presentation of the net response along with its components, demonstrates that the current minimum originates from the maximum on dc component, minimum on pulse component or both. In practice, DPP minimum, obtained in measurements with a SMDE, can be treated as an additional diagnostic parameter for the recognition of reactant adsorption or poor experimental conditions i.e. high resistance within electrode system or low conductivity of the electrolyte medium. doi: 10.5562-cca2054

current minimum; IR drop; reactant adsorption; components of the net response; differential pulse polarography

Autor: Marina Zelić - ; Division for Marine and Environmental Research, Ruđer Bošković Institute, POB 180, 10002 Zagreb, Croatia Iva



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