My situation is this, I am doing a job where I need to detect iron (II) with a colorimetric technique in a medium that has a considerable concentration of copper (II) and iron (III). The most common and used method is that of phenantroline, but the problem with it is that it suffers interference from both copper(II) and iron(III). So I have been looking to see if there is a specific iron (II) chelator that does not suffer interference from both cations, but I cannot find one. For example, 2,2'-dipyridyl forms complexes with copper(II). 4,7Diphenyl-1,10-phenanthroline I am not sure if it is interfered with by copper (II), because it does not say so in this article. But I find structures with copper(II) but with different ligands more the 4,7Diphenyl-1,10-phenanthroline. What could you recommend?
I put some references about where I extrated this information:
Garribba, E. et al. The Cu ( II ) -2 , 2 % -bipyridine system revisited. En: . 2000, vol. 299, p. 253-261. 2. Rajendraprasad, N. y Basavaiah, K. Modified spectrophotometric methods for determination of iron(III) in leaves and pharmaceuticals using salicylic acid. En: Indian Journal of Advances in Chemical Science. 2016, vol. 4, no. 3, p. 302-307. ISSN 2320-0928.
Clark, L.J. Iron(II) Determination in the Presence of Iron(III) Using 4,7-Diphenyl-1,10-phenanthroline. En: Analytical Chemistry. 1962, vol. 34, no. 3, p. 348-352. ISSN 15206882. DOI 10.1021/ac60183a014.
Moss, M.L. y Mellon, M.G. Colorimetric Determination of Iron with 2,2’ -Bipyridyl and with 2,2,2″-Terpyridyl. En: Industrial and Engineering Chemistry - Analytical Edition. 1942, vol. 14, no. 11, p. 862-865. ISSN 00964484. DOI 10.1021/i560111a014.
Govender, E., Harrison, S.T.L. y Bryan, C.G. Modification of the ferric chloride assay for the spectrophotometric determination of ferric and total iron in acidic solutions containing high concentrations of copper. En: Minerals Engineering. 2012, vol. 35, p. 46-48. ISSN 08926875. DOI 10.1016/j.mineng.2012.05.006.
You can use the reagent i,10-phenanthraline is specific for Fe(II) in solutions and food.... It is formed red-orange complex which absorption at wavelength 510 nm.
You can use the reagent 1,10-phenanthraline is specific for Fe(II) in solutions and food.... It is formed red-orange complex which absorption at wavelength 510 nm.
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