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Current Minimum in Differential Pulse Polarography

Zelić, Marina; Pižeta, Ivanka; Jadreško, Dijana (2012) Current Minimum in Differential Pulse Polarography. Croatica Chemica Acta, 85 (3). pp. 303-309. ISSN 0011-1643

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Abstract

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).

Item Type: Article
Uncontrolled Keywords: current minimum; IR drop; reactant adsorption; components of the net response; differential pulse polarography; mercury drop electrode; voltammetric measurements; reactant adsorption; part i; maxima; components; resistance; tellurium
Subjects: NATURAL SCIENCES > Chemistry
Divisions: Division for Marine and Enviromental Research
Projects:
Project titleProject leaderProject codeProject type
Elektroanalitička istraživanja mikrokristala i tragova otopljenih supstanci[26554] Milivoj Lovrić098-0982904-2907MZOS
Depositing User: Marina Zelić
Date Deposited: 11 Oct 2013 12:57
Last Modified: 07 Feb 2014 10:06
URI: http://fulir.irb.hr/id/eprint/777
DOI: 10.5562/cca2054

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