Electrospun nanofiber based colorimetric probe for rapid detection of Fe in water |
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Authors: | DA Ondigo ZR Tshentu N Torto |
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Institution: | 1. Department of Chemistry, Rhodes University, P.O. Box 94, Grahamstown 6140, South Africa;2. Department of Chemistry, Nelson Mandela Metropolitan University, P.O. Box 77000, Port Elizabeth, 6031, South Africa |
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Abstract: | An imidazole derivative, 2-(2′-pyridyl)imidazole (PIMH), was developed as a colorimetric probe for the qualitative analysis of Fe2+ in aqueous solution. PIMH was then used to post-functionalize poly(vinylbenzyl chloride) (PVBC) nanofibers after electrospinning so as to afford a solid state colorimetric probe. Upon treatment with Fe2+ the probe displayed a distinctive color change both in liquid and solid platforms. The linear dynamic range for the colorimetric determination of Fe2+ was 0.0988–3.5 μg mL−1. The ligand showed a high chromogenic selectivity for Fe2+ over other cations with a detection limit of 0.102 μg mL−1 in solution (lower than the WHO drinking water guideline limit of 2 mg L−1), and 2 μg mL−1 in the solid state. The concentration of Fe2+ in a certified reference material (Iron, Ferrous, 1072) was found to be 2.39 ± 0.01 mg L−1, which was comparable with the certified value of 2.44 ± 0.12 mg L−1. Application of the probe to real samples spiked with Fe2+ achieved recoveries of over 97% confirming accuracy of the method and its potential for on-site monitoring. |
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Keywords: | Colorimetric probe Fe2+ Electrospun nanofiber Water |
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