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Lignosulfonate‐Modified Electrode for Electrocatalytic Reduction of Acidic Nitrite
Author(s) -
Milczarek Grzegorz
Publication year - 2008
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.200704071
Subject(s) - nitrite , chemistry , amperometry , cyclic voltammetry , inorganic chemistry , redox , electrode , sulfuric acid , detection limit , standard hydrogen electrode , electrochemistry , voltammetry , reference electrode , chromatography , organic chemistry , nitrate
Sodium lignosulfonate (LS) undergoes oxidative electropolymerization on a glassy carbon (GC) electrode from sulfuric acid solution to form a chemically modified electrode exhibiting anionic character and redox activity. Cyclic voltammetry reveals the existence of two redox systems at E °′ values of +0.29 and +0.53 V, respectively. Peak currents are proportional to the scan rate as expected for surface confined systems. The GC|poly‐LS electrode shows electrocatalytic activity toward the reduction of acidic nitrite. When operating in a constant potential amperometric mode (at 0.0 V, vs. Ag/AgCl), a linear relationship between nitrite concentration and reduction current is observed over the range of 1 to 250 μM. The detection limit reaches 0.3 μM ( S / N =3). The electrode may be practically applied for nitrite determination in human saliva.