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Molecules 2018, 23(5), 1000; https://doi.org/10.3390/molecules23051000

Flow Injection Analysis with Direct UV Detection Following Electric Field Driven Membrane Extraction

1
Centre for Sustainable Nanomaterials, Ibnu Sina Institute for Scientific and Industrial Research, Universiti Teknologi Malaysia, 81310, Johor Bahru, Johor, Malaysia;norakma_0689@yahoo.com
2
Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, 81310, Johor Bahru, Johor, Malaysia
3
Department of Chemistry, University of Basel, Spitalstrasse 51, 4056 Basel, Switzerland
*
Author to whom correspondence should be addressed.
Received: 28 March 2018 / Revised: 17 April 2018 / Accepted: 20 April 2018 / Published: 25 April 2018
(This article belongs to the Special Issue Green Analytical Chemistry)
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Abstract

A method for on-line matrix elimination to enable selective quantification of ultraviolet absorbing analytes by a flow-injection analysis procedure is described. Selectivity is achieved by electric field driven extraction across a polymer inclusion membrane. The method was demonstrated on the example of the determination of naproxen from spiked human urine. Membranes of 10 μm thickness were employed which consisted of 7.5 mg cellulose triacetate as base polymer, 5 mg of o-nitrophenyl octyl ether as plasticizer and 7.5 mg of Aliquat 336 as cationic carrier. Ten μL of sample was introduced into a continuous stream of background solution consisting of 100 µM aqueous NaClO4 with a flow rate of 2 μL/min while applying a voltage of 150 V to the extraction cell. The target ion was electrokinetically transported across the membrane and enriched in 1.5 μL of a stagnant acceptor solution. This was subsequently pumped past a flow-through UV detector for quantification. The method showed a linear range from 5 to 200 µM with a correlation coefficient of 0.9978 and a reproducibility of typically 7% (n = 8). The detection limit of the method for naproxen was 2 µM. View Full-Text
Keywords: electromembrane extraction; matrix elimination; miniaturization; flow-injection analysis electromembrane extraction; matrix elimination; miniaturization; flow-injection analysis
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See, H.H.; Mamat, N.A.; Hauser, P.C. Flow Injection Analysis with Direct UV Detection Following Electric Field Driven Membrane Extraction. Molecules 2018, 23, 1000.

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