Kinetics of the Iodide-Catalyzed Manganese(III)–Arsenic(III) Reaction in the Presence of Sulfuric Acid

✍ Scribed by T.J. Pastor; G.A. Milovanović; G.M. Petković

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 227 KB
• Volume: 60
• Category: Article
• ISSN: 0026-265X
• DOI: 10.1006/mchj.1998.1618

✦ Synopsis

The kinetics of the iodide-catalyzed reaction of manganese(III) with arsenic(III) in sulfuric acid solution are studied in this work. The reaction rate was followed photometrically at 486 nm. The conditions under which the iodide ions have a maximum influence were established and the kinetic expressions for the investigated reaction were determined, both in the presence and in the absence of iodide. The apparent rate constants of these reactions were calculated and their temperature dependence was examined. On the basis of the obtained results, the corresponding thermodynamic parameters were calculated. In addition, a kinetic method for the determination of traces of iodide, with the detection limit of 0.72 ng dm Ϫ3 and a relative standard deviation of up to 6%, was developed. The effect of extrinsic ions on the accuracy of these determinations was also investigated.