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A novel batch electrode design for use in stripping potentiometry facilitating medium exchange
Author(s) -
Jagner Daniel,
Renman Lars,
Wang Yudong
Publication year - 1992
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.1140040303
Subject(s) - stripping (fiber) , dimethylglyoxime , potentiometric titration , electrolysis , electrode , working electrode , glass electrode , anodic stripping voltammetry , reference electrode , chemistry , cobalt , analytical chemistry (journal) , glassy carbon , inorganic chemistry , materials science , chromatography , cyclic voltammetry , electrochemistry , electrolyte , composite material
Medium exchange between electrolysis and stripping steps affords numerous advantages in both voltammetric and potentiometric stripping techniques. A new electrode design for batch mode stripping analysis that allows simple medium exchange under potentiostatic control is described. This is achieved by adherence of a drop of sample to a glass tube containing a glassy‐carbon disc working electrode and a porous ceramic plug, which is in liquid contact with the inner solution in which the reference and counter electrodes are situated. The electrode can be used both for manual operation and for an automated system with a sample changer. Its use is demonstrated in the constant‐current stripping potentiometry determination of the dimethylglyoxime complexes of nickel(II) and cobalt(II) after medium exchange with stripping in 5 M CaCl 2 , thus avoiding interferences from dissolved oxygen and excessive amounts of zinc(II).