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Enhanced voltammetric waves of iron(III)—EDTA at a chitin‐containing carbon paste electrode and its analytical application
Author(s) -
Bai ZhuPing,
Nakamura Toshio,
Izutsu Kosuke
Publication year - 1990
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.1140020114
Subject(s) - differential pulse voltammetry , carbon paste electrode , graphite , chemistry , chelation , voltammetry , analytical chemistry (journal) , carbon fibers , cyclic voltammetry , electrode , detection limit , nuclear chemistry , inorganic chemistry , materials science , electrochemistry , chromatography , composite number , organic chemistry , composite material
A chitin‐containing carbon paste electrode was found to give highly sensitive voltammetric waves for Fe(III)‐EDTA chelate both in cyclic voltammetry (CV) and in differential pulse voltammetry (DPV). Various conditions for the determination of trace Fe(III) were studied. The optimum chitin content in the carbon paste (graphite powder: mineral oil = 2:1) was 6% (by weight). In a solution of 0.01 M KCl and 3 × 10 −4 M EDTA (pH 3.0), the DPV peak potential for the reduction of Fe(III)‐EDTA was −0.05 V vs. Ag/AgCl. The peak current was proportional to the Fe(III) concentration between 2 × 10 −7 and 6.5 × 10 −6 M; the relative standard deviation for 2 × 10 −6 M Fe(III) was 2.6%. The method was fairly free from interference and could be applied to the determination of iron in both river and tap water.