Determination of Low-Level Ethylenediaminetetraacetic Acid in Water Samples by Ion Chromatography with Ultraviolet Detection |
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| Authors: | T Kemmei S Kodama A Yamamoto Y Inoue K Hayakawa |
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| Institution: | (1) Toyama Institute of Health, 17-1 Nakataikoyama, Imizu Toyama, 939-0363, Japan;(2) Department of Biological Chemistry, College of Bioscience and Biotechnology, Chubu University, Matsumoto-cho 1200, Kasugai 487-8501, Japan;(3) Department of Preventive Medicine and Environmental Health, Osaka City University Medical School, Asahi-machi, Abeno, Osaka 545-8585, Japan;(4) Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan |
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| Abstract: | A convenient and sensitive ion chromatographic (IC) method for the analysis of ethylenediaminetetraacetic acid (EDTA) in water
samples was proposed. Using a fast reversible reaction of free EDTA and metal–EDTA complexes into Fe(III)–EDTA complex in
the presence of Fe(III) ions, sample solutions were applied to an ion-exchange column using a mobile phase (pH 2.3), which
was composed of 100 μM Fe(III) chloride and 5 mM methanesulfonic acid. The addition of Fe(III) solution (100 μL) containing
10 mM Fe(III) chloride and 0.5 M methanesulfonic acid to the sample solution (10 mL) permitted the injection of a large volume
(400 μL) of sample, which allowed for greater sensitivity. The proposed IC method gave a highly linear (r
2 > 0.999) calibration curve ranging 0.005–1.0 μM EDTA and had a limit of detection of 1.5 nM. High repeatability (RSD < 2.1%)
and recoveries (88–108%) were also obtained. With this method, total EDTA level in raw and drinking waters were analyzed successfully. |
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| Keywords: | Ion chromatography Drinking water Ethylenediaminetetraacetic acid |
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