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Development of absorption spectrophotometry of iron(III) in environmental water and sediments using NEDA and its application to the field

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Abstract

In this study, we developed a simple method that enables iron(III) in environmental water to be directly determined via spectrophotometry. In water samples, iron(III) formed a yellowish complex with N-1-Naphthylethylenediamine dihydrochloride (NEDA) at pH 2.0–2.8, the maximum absorption wavelength of which was 462 nm. Detection sensitivity increased in the presence of chloride ions and remained constant for 2–24 h with 0.05–0.57 mol L−1 chloride. Therefore, NEDA solution containing chloride ions was used as a chromogenic reagent for the determination of iron(III). The determination range for this method was 0.1–20 mgFe(III) L−1 in a 5 cm glass cell. The developed method is highly selective for iron(III) and has been successfully applied to freshwater, brackish water, seawater, turbid water in rivers, as well as to riverbed and freshwater lake sediments. In addition, a combination of the proposed NEDA method and the 1,10-phenanthroline method enabled simultaneous determination of iron(III) and iron(II).

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Acknowledgements

Parts of this study were performed with support from the Ministry of Education, Culture, Sports, Science and Technology Grant-in-Aid for Scientific Research (No. 18K14262 to Egawa). We would like to thank Editage (www.editage.jp) for English language editing.

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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Michiko Egawa, Shogo Sugahara, Keiya Miwa, J.Y. Park, and Yukiko Senga. The first draft of manuscript was written by Michiko Egawa and Yasushi Seike, and all authors commented on previous version of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Michiko Egawa or Yasushi Seike.

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Egawa, M., Sugahara, S., Miwa, K. et al. Development of absorption spectrophotometry of iron(III) in environmental water and sediments using NEDA and its application to the field. ANAL. SCI. (2024). https://doi.org/10.1007/s44211-024-00598-4

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  • DOI: https://doi.org/10.1007/s44211-024-00598-4

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