Vol. 2 No. 8 (2025): International Journal of Science and Technology
Articles

OPTIMAL CONDITIONS FOR SPECTROPHOTOMETRIC DETERMINATION OF IRON (III) IONS USING INDIGO

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  • S.Majidov,
  • I. Otaqulov

Published 23-06-2025

Keywords

  • Indigo, metal complex, optimal conditions, reagent, buffer solution, order of addition, law of light absorption, Asmus method, Tolmachev graph, calibration curve, quantum chemical calculations, isomolar series method, thin-layer chromatography, and others.
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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

How to Cite

OPTIMAL CONDITIONS FOR SPECTROPHOTOMETRIC DETERMINATION OF IRON (III) IONS USING INDIGO. (2025). INTERNATIONAL JOURNAL OF SCIENCE AND TECHNOLOGY, 2(8), 44–47. https://doi.org/10.70728/tech.v2.i08.016

Abstract

Indigo is one of the most stable compounds found among heterocyclic compounds and is abundant in natural sources. Due to the presence of donor groups such as =CO and -NH2, it is possible to form metal complexes. In our study, we investigated the optimal conditions for the spectrophotometric determination of iron (III) ions using indigo as a reagent. The maximum absorption region of the metal complex was found to be: λ max (FeR) = 370 nm, with an optimal solution pH (FeR) = 5.6. The range of adherence to the Beer-Lambert law was determined to be: C25µg/ml(FeR) = 1 – 35µg/25ml. Additionally, the reproducibility and accuracy of the method were assessed, and calibration curves were developed. 

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