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Electrochemical Behavior of Dithionite in Formaldehyde Aqueous Solution and Its Analytical Application
Author(s) -
de Carvalho Leandro M.,
Schwedt Georg
Publication year - 2001
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200105)13:7<596::aid-elan596>3.0.co;2-2
Subject(s) - dithionite , sodium dithionite , aqueous solution , polarography , chemistry , electrochemistry , formaldehyde , adsorption , dropping mercury electrode , detection limit , inorganic chemistry , cyclic voltammetry , electrode , voltammetry , analytical chemistry (journal) , chromatography , organic chemistry , enzyme
The electrochemical behavior and the analytical determination of dithionite after reaction with formaldehyde in aqueous solution is described. Alternating current voltammetric and cyclic voltammetric measurements were employed to elucidate the mechanism of the electrode process, based on the adsorption phenomena of the hydroxymethanesulfinate ion formed and their subsequent irreversible oxidation on the mercury electrode surface. The reaction makes possible the sensitive analytical determination of dithionite in a stable form using differential‐pulse polarography. The linear range for the measurements was from 3.2 ×10 −5 to 2.2×10 −3 mol L −1 dithionite with a detection limit calculated as 1.95×10 −5 mol L −1 . The reaction was shown to be useful to determine dithionite after stabilization in solution, showing its degradation process relative to different elapsed times after preparation of the aqueous solution.