vuzbiochemiИзвестия вузов. Прикладная химия и биотехнологияProceedings of Universities. Applied Chemistry and Biotechnology2227-29252500-1558ИРНИТУ10.21285/2227-2925-2019-9-3-395-402vuzbiochemi-212Research ArticleХИМИЧЕСКИЕ НАУКИCHEMICAL SCIENCESОпределение микроколичеств железа в природных продуктахTrace determination of iron in natural productsМамедоваЧ. А.MammadovaCh. A.

аспирант химического факультета;

научный сотрудник НИЛ «Экологическая химия и охрана окружающей среды», 

г. Баку

Postgraduate Student, Faculty of Analytical Chemistry;Researcher, Scientific Laboratory "Ecological Chemistry and Environmental Protection",

Baku

chinara.mamedova.86@mail.ruБакинский государственный университетРоссияBaku State UniversityRussian Federation20190610201993395402Copyright © Мамедова Ч.А., 20192019Мамедова Ч.А.Mammadova C.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://vuzbiochemi.elpub.ru/jour/article/view/212

На основе салицилового альдегида синтезирован новый органический реагент – (Е)-2-гидрокси-3-((2-гидроксибензилиден)(амино)бензолсульфокислота. Изучено комплексообразование железа (III) c (Е)-2-гидрокси-3-(2-гидроксибензилиден)(амино)бензолсульфокислотой (R) в присутствии и в отсутствие поверхностно-активных веществ (ПАВ) – цетилпиридиний хлорида, цетилтриметиламмоний бромида и Тритон Х-114. Установлено, что железо (III) с реагентом образует окрашенные разнолигандные комплексы в присутствии третьих компонентов. Определены оптимальные условия комплексообразования для бинарного комплекса Fe(III)-R (pH = 4, λмах = 353 нм), а также для разнолигандных комплексов – Fe(III)-R–ЦПCl (pH = 3, λмах = 374 нм), Fe(III)-R-ЦПМАBr (pH = 2, λмах = 392 нм) и Fe(III)-R-Тритон Х-114 (pH = 3, λмах = 385 нм). Установлено соотношение реагирующих компонентов в составе однороднолигандных соединений железа – Fe(III)-R – 1:2, и смешаннолигандных: Fe(III)-R–ЦПCl – 1:1:2; Fe(III)-R-ЦПМАBr – 1:1:1, Fe(III)-R-Тритон Х-114 – 1:2:1. Определены молярные коэффициенты поглощения и константы устойчивости комплексов Fe(III). Молярные коэффициенты комплексов Fe(III)-R, Fe(III)-R–ЦПCl, Fe(III)-R-ЦПМАBr и Fe(III)-R-Тритон Х-114 составляют 10000, 16250, 19000 и 11000 соответственно. Установлен интервал подчинения закону Бера, мкг/мл: Fe(III)-R – 0,448–2,24; Fe(III)-R–ЦПCl – 0,112–4,48; Fe(III)-R-ЦПМАBr – 0,12–4,48; Fe(III)-R-Тритон Х-114 – 0,224–2,24. Изучено влияние некоторых ионов и маскирующих веществ на образование бинарного и разнолигандных комплексов Fe(III). Показано, что в присутствии ПАВ значительно увеличивается избирательность реакции. Разработана методика спектрофотометрического определения Fe(III) в фасоли, грибах и шиповнике. Данные, полученные по предлагаемой методике, и результаты атомно-абсорбционной спектрометрии хорошо согласуются между собой. Предлагаемая методика определения Fe(III) с (Е)-2-гидрокси-3-(2-гидроксибензилиден)(амино)бензолсульфокислотой в присутствии цетилтриметиламмоний бромида (ЦТМАBr) проста, экспрессна и дает надежные результаты. 

A new organic reagent, (E)-2-hydroxy-3-((2-hydroxybenzylidene) (amino) benzenesulphonic acid, was synthesised on the basis of salicylic aldehyde. The complexation of iron (III) with c (E)-2-hydroxy-3-(2- hydroxybenzylidene) (amino) benzenesulphonic acid (R) was studied both in the presence and absence of the following surface-active substances (SAA): cetylpyridinium chloride, cetyltrimethylammonium bromide and Triton X-114. Fe (III) was established as forming coloured mixed-ligand complexes with the reagent in the presence of third components. The optimal complexation conditions were determined for the Fe (III)-R binary complex (pH = 4, λmax = 353 nm), as well as for the multi-ligand complexes of Fe(III)-R-CPCl (pH = 3, λmax = 374 nm), Fe(III)-R-CPMABr (pH = 2, λmax = 392 nm) and Fe(III)-R-Triton X-114 (pH = 3, λmax = 385 nm). The proportion of reacting components in the composition of Fe(III)-R homogeneous ligand iron compounds was determined to be equal to 1:2. Mixed ligand compositions were 1:1:2, 1:1:1 and 1:2:1 for Fe (III)-R-CPCl, Fe(III)-R-CPMABr and Fe(III)-R-Triton X-114, respectively. The molar absorption coefficients and stability constants of Fe(III) complexes were determined. The molar coefficients of the complexes Fe(III)-R, Fe(III)-R-CPCl, Fe(III)-R-CPMABr and Fe(III)-R-Triton X-114 comprise 10,000, 16,250, 19,000 and 11,000, respectively. The intervals of obedience to Beer's law (μg/mL) were determined to range 0.448-2.24, 0.112-4.48, 0.12-4.48 and 0.224-2.24 for Fe(III)-R, Fe(III)-R-CPCl, Fe(III)-R-CPMABr and Fe(III)-R-Triton X-114, respectively. The effect of some ions and masking substances on the formation of binary and mixed-ligand complexes of Fe(III) was studied. The presence of a surfactant was demonstrated to significantly increase the selectivity of the reaction. A technique was developed for spectrophotometric determination of Fe(III) in beans, mushrooms and briar. The data obtained using the proposed method are in good agreement with the results of atomic absorption spectrometry. The proposed method for the determination of Fe(III) with (E)-2-hydroxy-3-(2-hydroxybenzylidene)(amino)benzenesulphonic acid in the presence of cetyltrimethylammonium bromide (CTMABr) is simple, rapid and provides reliable results. 

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The authors declare that there are no conflicts of interest present.