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A simple in situ preconcentration method for the simultaneous determination of major and minor alkali and alkaline-earth metals in natural waters using iminodiacetate-grafted fiber

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Abstract

A simple and effective procedure was developed for the simultaneous in situ preconcentration of major and minor alkali and alkaline-earth metals (Li, Na, K, Rb, Mg, Ca, Sr, and Ba) from natural waters with iminodiacetate-grafted fiber (IDA-fiber), using soil water extracts as an example. The method was verified on mixed standard solutions of the metals at concentrations and ionic strengths reported for regular soil solutions. When complemented with routine microfiltration procedures, the method could distinguish between the dissolved in hydrated ion form and bound fractions of these metals, presumably colloidal and firmly complexed. The method was tested on water extracts from heavy clayey Vertisol and light red sandy-loam soils. The results showed that most of the Rb, Mg, Ca, Sr, and Ba of the 0.45-μm filtrate were bound to unreactive water-mobile compounds, whereas K and Na were determined predominantly in dissolved/reactive forms. The preliminary charged IDA-fiber can be used to preconcentrate the metals in situ from soil water and other types of natural waters with subsequent determination in a stationary laboratory, thus avoiding the critical step of storage and transportation of the unstable water samples.

A bundle of preliminary charged iminodiacetate-grafted fiber placed in a water-sample during in-field preconcentration procedure.

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Acknowledgements

Financial support provided by Misrad ha-Klita (Jerusalem, Israel) is appreciated. The authors thank Victor Kislovsky from the Faculty of Mechanical Engineering, Technion, for his valuable remarks on the topic; Elizabeth de Funes and Dounya Kana-Soufi, Katter Group (Haifa, Israel), for the technical support; and Takanobu Sugo, KJK Co. (Takasaki, Japan), for supplying the authors with the IDA-fiber. The authors express their sincere gratitude to the anonymous reviewers whose scrupulous work and substantial notes and suggestions brought about improvements to the manuscript.

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Authors and Affiliations

  1. Faculty of Civil and Environmental Engineering, Technion - Israel Institute of Technology, 3200003, Haifa, Israel

    Fyodor S. Kot & Malik Kochva

  2. Department of Applied Chemistry and Biotechnology, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan

    Kunio Fujiwara

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  1. Fyodor S. Kot
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  2. Kunio Fujiwara
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  3. Malik Kochva
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Correspondence to Fyodor S. Kot.

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Kot, F.S., Fujiwara, K. & Kochva, M. A simple in situ preconcentration method for the simultaneous determination of major and minor alkali and alkaline-earth metals in natural waters using iminodiacetate-grafted fiber. Anal Bioanal Chem 409, 3917–3922 (2017). https://doi.org/10.1007/s00216-017-0335-5

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  • DOI: https://doi.org/10.1007/s00216-017-0335-5

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