ISSN:
1432-1130
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Cyclic voltammetry of iron-EDTA and iron-DETPA, in different supporting electrolytes showed electrochemical reversibility in ammonium citrate at pH 8.0, while quasi-reversible nature was noticed with iron-NTA. The absence of electroactive peaks when adding a polyhydric alcohol such as mannitol (providing greater stability to the chelate in alkaline pH) or a tertiary amine such as triethanolamine (as an organic buffer) to the supporting electrolyte enabled the use of CV for quantitative analysis of iron in a complex matrix containing these ingredients. The decrease in the diffusion coefficient of Fe(III)-chelate with an increase in the organic buffer suggested the need for limiting the concentration of the amine in order to obtain efficient mass transport while providing better pH control, when such a solution is required for the oxidation of the sulfide/hydrosulfide ion to elemental sulfur.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s002160050110
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