Kinetic of Copper(III)/(II) Tetraglycine Reactions with Sulfite. Analytical Potentialities

Autor:	Nina Coichev, Rodrigo Leandro Bonifácio, Horacio Dorigan Moya, Deborah Yoshida
Rok vydání:	1998
Předmět:	Detection limit Flow injection analysis Kinetics Inorganic chemistry Formaldehyde chemistry.chemical_element Copper Atomic and Molecular Physics and Optics Analytical Chemistry Absorbance chemistry.chemical_compound Reaction rate constant Sulfite chemistry Spectroscopy
Zdroj:	Scopus-Elsevier
ISSN:	1532-2289 0038-7010
DOI:	10.1080/00387019808001655
Popis:	The oxidation of Cu(II)/tetraglycine complex in borate buffer (pH=9.2) in aqueous medium, by dissolved oxygen is strongly accelerated by S(IV). The reaction is adequate for S(IV) determination as the concentration of (Cu(H-3G4)]− formed is proportional to SO32- concentration. The [Cu(H-3G4)]− presents a maximum absorbance at 365 nm (∊ = 7400 mol−1.L.cm−1) and it was followed spectrophotometrically by flow injection analysis procedure. The detection limit was 7×10−6 mol.L−1 and the linear regression showed a standard deviation of 0.02% (n=5). Kinetics studies showed the catalytic effect of some transition metal ions, “which can be present in environmental samples, in the oxidation of S(IV). The pseudo-first-order rate constants were determined in the presence of formaldehyde.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::071dca1fff4cb4b8ff3c0e86f00d3626 https://doi.org/10.1080/00387019808001655 Zobrazit plný text záznamu