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Simple photometric determination of free cyanide ion in aqueous solution with 2,6-dichlorophenolindophenol

✍ Scribed by Yari, Abdollah ;Kargosha, Kazem

Book ID
111487889
Publisher
Walter de Gruyter GmbH
Year
2006
Tongue
English
Weight
249 KB
Volume
4
Category
Article
ISSN
2391-5420

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✦ Synopsis

Abstract

In this work, a simple photometric method with high accuracy and precision for measuring trace amounts of free cyanide ion in aqueous solution is demonstrated. Under the evaluated conditions, we could determine CN− concentration in the range of 5–70 ppm easily. The work is based upon the photometric titration of CN− with Co(II) in the presence of 2,6-dichlorophenolindophenol (DCPIP) at λmax = 602 nm in aqueous solution. The optimal conditions, such as pH, ionic strength, and concentration of chromopher were evaluated. The interence effect of many other cations and anions studied and the results are given here. The optimized titration was successfully used to determine the concentration of free cyanide ion in aqueous solutions.

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## Abstract Interactions between pyridine‐2,6‐dicarboxylic acid and 4‐hydroxypyridine‐2,6‐dicarboxylic acid with Cu(II), Pb(II), and Cd(II) ions were characterized in aqueous solutions (20°C; I = 0.4 (KNO~3~)) by means of dc‐polarography. In solutions with excess of ligand, Cu(II), Pb(II), and Cd(I