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Influence of N ‐Substituted Aminosulfonic Acids with a Morpholinic Ring pH Buffers on the Redox Processes of Copper or Zinc Ions: A Contribution to Speciation Studies
Author(s) -
Soares Helena M. V. M.,
Pinho Sílvia C.,
Barros M. Graça R. T. M.
Publication year - 1999
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/(sici)1521-4109(199911)11:17<1312::aid-elan1312>3.0.co;2-i
Subject(s) - chemistry , zinc , copper , anodic stripping voltammetry , inorganic chemistry , electrochemistry , polarography , voltammetry , metal ions in aqueous solution , cyclic voltammetry , metal , redox , differential pulse voltammetry , electrode , organic chemistry
The electrochemical behavior of copper(II) or zinc(II) metal ions was investigated in the presence of different pH buffers [3‐( N ‐morpholino)‐2‐hydroxypropanesulfonic acid (MOPSO), 2‐( N ‐morpholino)ethanesulfonic acid (MES) and 3‐( N ‐morpholino)propanesulfonic acid (MOPS)] by differential pulse anodic stripping voltammetry (DPASV) and differential pulse polarography (DPP). These studies showed that these pH buffers did not complex zinc or copper, but MOPSO and MOPS modified the reversibility of copper electrochemical DPASV and DPP (only MOPSO) responses, under the experimental conditions used. Depression of peak current for both metal ions was also observed in the presence of all pH buffers due to surface coverage of the electrode by those compounds, which was verified by alternating current voltammetry (ACV).