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Reference type: Journal
Authors: Trammell SA, Melde BJ, Zabetakis D, Deschamps JR, Dinderman MA, Johnson BJ, Kusterbeck AW
Article Title: Electrochemical detection of TNT with in-line pre-concentration using imprinted diethylbenzene-bridged periodic mesoporous organosilicas.
Publication date: 2011
Journal: Sensors and Actuators B: Chemical
Volume: 155
Issue: (2)
Page numbers: 737-744.
DOI: 10.1016/j.snb.2011.01.039
Alternative URL: http://www.sciencedirect.com/science/article/pii/S0925400511000566

Abstract: We examined the adsorption and release of TNT using diethylbenzene-bridged (DEB) periodic mesoporous organosilica sorbents under varying conditions. The sorbents were applied for in-line target pre-concentration in conjunction with an electrochemical flow cell containing a glassy carbon electrode. Square wave voltammetry was employed for TNT detection. TNT sample volumes between 2 and 480 mL at concentrations ranging from 0.5 to 500 ppb were passed through the DEB sorbents (imprinted or not imprinted for TNT) at pH 6 (sodium acetate) or at pH 7.4 (PBS). Release of target was accomplished using solvent mixtures of methanol/water with sodium acetate as electrolyte or acetonitrile/water with PBS components as electrolyte. Under these conditions, the TNT was released in <200 μL of the solvent mixture, and pre-concentration factors of >3000 can be achieved when using large volumes of trace TNT samples. When sample volumes of 2 mL were utilized, the sensing system gave a linear response between 20 and 500 ppb with an estimated limit of detection of 13 ppb. When pre-concentrating 480 mL of sample in either buffered solution or seawater, detection of 0.5 ppb TNT was achieved with a signal to noise ratio of 20.
Template and target information: TNT, 2,4,6-trinitrotoluene
Author keywords: Square wave voltammetry, pre-concentration, Periodic mesoporous organosilicas, 2,4,6-Trinitrotoluene (TNT)

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