Title: Sensitive Spectrophotometric Determination of Chromium with 2-(5-Chloro-2-pyridylazo)-5-dimethylaminophenol
Abstract: The optimal conditions for the development of complexation reactions between Cr(III) and 2-(5-chloro-2-pyridylazo)-5-dimethylaminophenol (5.C1DMP AP) were studied. When a mixture of a hydroethanolic solution of the reagent and an aqueous solution of Cr(III) were heated, three different complex species were formed, depending on the composition and pH of the medium (ε=I.7× 1051 mol-1 cm-1). All of them were hardly soluble when the proportion of organic solvent was low. The stoichiometry of the different complexes was determined, the formation mechanisms were elucidated and the respective constants were calculated. A useful absorptiometric method is proposed for Cr(III) in concentrations ranging from 15 to 400 ppb. The proper ways to reduce interferences produced by Fe(III), Nb<V), Ta(V), Ti(IV), V(V), Co(II), Zr(IV), Sn(II), A1(III), Mn(II) and Cu(II) are described. The methods were applied to chromium determination in water samples with very satisfactory results.
Publication Year: 1995
Publication Date: 1995-06-01
Language: en
Type: article
Indexed In: ['crossref']
Access and Citation
Cited By Count: 3
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot