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Olivé-Monllau, Rosa
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article
Novel amperometric sensor based on rigid near-percolation composite
Abstract
A novel amperometric sensor based on a rigid graphite-epoxy composite of which composition is near to the percolation is reported. The electrochemical response of the novel transducer material was evaluated in terms of reproducibility of the fabrication process and reproducibility and repeatability of the analytical signal. The signal to noise ratio was improved, atomic force microscopy (AFM) technique was used to obtain qualitatively information. Amperometric detection of chlorine in water was carried on at a set potential of - 250 mV vs. Ag/AgCl. The developed flow injection analysis (FIA) system responded linearly to chlorine concentration between 0.15 mg L-x and 4 mg L-x with a sensitivity of - 0.20 μA L mg-1. The proposed system was applied to real samples from swimming-pool water. No significant difference was observed regarding the standard method. © 2009 Wiley-VCH Verlag.