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

IF 1.8 4区化学 Q3 CHEMISTRY, ANALYTICAL

Analytical Sciences Pub Date : 2024-05-29 DOI:10.1007/s44211-024-00598-4

Michiko Egawa, Shogo Sugahara, Keiya Miwa, Ja Yeong Park, Yukiko Senga, Yasushi Seike

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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).

Graphical abstract

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利用 NEDA 开发环境水和沉积物中铁(III)的吸收分光光度法及其实地应用。

在这项研究中，我们开发了一种简单的方法，可通过分光光度法直接测定环境水体中的铁（III）。在 pH 值为 2.0-2.8 的水样中，铁(III)与 N-1-Naphthylethylenediamine dihydrochloride (NEDA) 形成淡黄色络合物，其最大吸收波长为 462 nm。检测灵敏度在氯离子存在时增加，在 0.05-0.57 mol L-1 氯化物存在的 2-24 小时内保持不变。因此，含氯离子的 NEDA 溶液被用作测定铁(III)的发色试剂。在 5 cm 玻璃池中，该方法的测定范围为 0.1-20 mgFe(III) L-1。该方法对铁(III)具有高选择性，已成功应用于淡水、苦咸水、海水、河流浊水以及河床和淡水湖沉积物。此外，将所提出的 NEDA 方法与 1,10-菲罗啉法相结合，可同时测定铁(III)和铁(II)。

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来源期刊

Analytical Sciences 化学-分析化学

CiteScore

2.90

自引率

18.80%

发文量

232

审稿时长

1 months

期刊介绍： Analytical Sciences is an international journal published monthly by The Japan Society for Analytical Chemistry. The journal publishes papers on all aspects of the theory and practice of analytical sciences, including fundamental and applied, inorganic and organic, wet chemical and instrumental methods. This publication is supported in part by the Grant-in-Aid for Publication of Scientific Research Result of the Japanese Ministry of Education, Culture, Sports, Science and Technology.