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DETERMINATION OF IRON (III) IN VARIOUS APPLE CULTIVARS USING THE SPECTROPHOTOMETRIC METHOD
Authors: R.A. Aliyeva*, A.V. Ayvazova*, F.E. Espandi**, F.M. Chiragov
Number of views: 474
In this study, a reagent based on benzoylacetone is synthesized, and its analytical potential for determining iron (III) is established. The complexation of iron (III) with 1-phenyl-2- [2-hydroxyphenylazo] butadione-1,3 (PHPAB) in the presence of diantipyrylmethane (DAM), diantipyrylphenylmethane (DAPM) and diantipyrilotoxyphenylmethane (DAOPM) is analysed and optimal conditions for the complexation are established. The main spectrophotometric characteristics of the as-obtained complexes are calculated, including pHopt, λopt, the molar absorption coefficient, the composition of the complexes and the interval of subordination to Beer's law. The study of iron (III) complexation with the reagent shows that multi-ligand complexes form in the presence of DAM, DAPM and DAOPM. In this process, bathochromic shifts in the absorption spectrum are observed, with the maximum yield shifting to an acid medium. The ratios of the reacting components are calculated for homogeneous Fe-R (1: 2), multi-ligand FeR-DAM (1: 2: 2), FeR-DAPM (1: 2: 1) and FeR-DAOPM (1: 2: 2) complexes. The determination of iron (III) with the reagent in the presence of DAOPM is shown to be highly selective. The effect of some ions and masking agents on the formation of bi- and multi-ligand iron (III) complexes is studied. It is demonstrated that significant amounts of alkali and alkaline earth metals do not hinder the process of iron determination. The developed technique is used to determine the micro-quantities of iron (III) in three apple cultivars.