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Abstract: This work reports a rapid, simple and low-cost voltammetric sensor based on a dummy molecularly imprinted polymer (MIP) that uses 2,4-dinitrophenol (DNP) as a template for the quantification of 2,4,6-trinitrotoluene (TNT) and DNP, and the identification of related substances. Once the polymer was synthesised by thermal precipitation polymerisation, it was integrated onto a graphite epoxy composite (GEC) electrode via sol-gel immobilisation. Scanning electron microscopy (SEM) was performed in order to characterise the polymer and the sensor surface. Responses towards DNP and TNT were evaluated, displaying a linear response range of 1.5 to 8.0 μmol L-1 for DNP and 1.3 to 6.5 μmol L-1 for TNT; the estimated limits of detection were 0.59 μmol L-1 and 0.29 μmol L-1, for DNP and TNT, respectively. Chemometric tools, in particular principal component analysis (PCA), demonstrated the possibilities of the MIP-modified electrodes in nitroaromatic and potential interfering species discrimination with multiple potential applications in the environmental field
Template and target information: 2,4-dinitrophenol, DNP, 2,4,6-trinitrotoluene, TNT
Author keywords: Molecularly imprinted polymers, dummy template, Voltammetric detection, 2,4,6-Trinitrotoluene, nitroaromatic compounds