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Polarographic maxima revisited
Author(s) -
Noufi Mouna,
Yarnitzky Chaim,
Ariel Magda
Publication year - 1996
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140080825
Subject(s) - maxima , polarography , drop (telecommunication) , electrolyte , analytical chemistry (journal) , chemistry , supporting electrolyte , inorganic chemistry , chromatography , electrode , art , telecommunications , performance art , computer science , art history
Abstract The relation between maxima (of the first kind) and drop lifetime‐potential (TE) curves was investigated by recording both the DC polarogram and the TE curve and comparing the latter to that obtained with the blank solution, under identical conditions. The advanced instrumentation for measuring drop life‐time allowed the detection of minute variations occurring in various regions of the applied potential range. Positive maxima were studied with CU II /ClO 4 − , Cu II /Cl − , Pb II /Cl − , Fe III /C 2 O 4 2−and UO 2 2+ /C 2 O 4 2−systems; negative maxima, with solutions of Ni II , Zn II and Pb II . Hypotheses explaining the variations in maximum shape and height and in drop lifetime, taking into account the nature of the electroactive species (mainly, the location of the reduction step vs. the pzc), or the supporting electrolyte concentration are submitted, including the differing behavior observed with positive and negative maxima.