S(IV) induced autoxidation of Cu(II)/tetraglycine complexes in the presence of aldehydes: mechanistic considerations and analytical applications

Autor:	María V. Alipázaga, Nina Coichev, Luis Kosminsky, Mauro Bertotti
Rok vydání:	2002
Předmět:	Flow injection analysis Detection limit chemistry.chemical_compound chemistry Autoxidation Sulfite Extraction (chemistry) Inorganic chemistry Analytical chemistry Acetaldehyde Formaldehyde Amperometry Analytical Chemistry
Zdroj:	Talanta. 57:375-381
ISSN:	0039-9140
DOI:	10.1016/s0039-9140(02)00039-5
Popis:	An indirect amperometric method for the determination of sulfite in a flow injection configuration is described. The procedure is based on the amperometric measurement (E=0.1 V) of Cu(III) chemically generated by the S(IV) induced oxidation of Cu(II)/tetraglycine by dissolved oxygen. The dynamic analytical range was 5–100 μM with a detection limit of 1 μM. The repeatability for the determination (10 μM) was evaluated to be 1.4% (n=20). The method was employed for the determination of S(IV) in wine after its extraction from acidified samples by bubbling argon and the results were in agreement with those obtained by the iodometric procedure. The influence of formaldehyde and acetaldehyde on the Cu(III) formation is also discussed on the basis of the mechanism of the induced reaction.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f18a3a3e0e16d13164cc05bc49f93013 https://doi.org/10.1016/s0039-9140(02)00039-5 Zobrazit plný text záznamu Full Text from ScienceDirect