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Determination of chromium(VI) and chromium(III) by using a diphenylcarbazide‐modified carbon paste electrode
Author(s) -
Paniagua A. R.,
Vazquez M. D.,
Tascon M. L.,
Batanero P. Sanchez
Publication year - 1993
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.1140050211
Subject(s) - chromium , carbon fibers , electrochemistry , polarography , chemistry , electrode , carbon paste electrode , inorganic chemistry , horizontal scan rate , nuclear chemistry , cyclic voltammetry , materials science , organic chemistry , composite number , composite material
Abstract A carbon paste electrode modified with diphenylcarbazide has been prepared in order to improve the analytical determination of chromium(VI) and chromium(III) using voltammetric techniques. Several parameters, such as carbon/diphenylcarbazide ratio, carbon/Nujol ratio, scan rate, accumulation time, etc., have been explored. A voltammetric study of both chemical species and an explanation of the chemical and electrochemical mechanism are presented. When applied to assays of soil samples, the results compared favorably to those of a polarographic method.