期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 155, 期 2, 页码 737-744出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2011.01.039
关键词
Square wave voltammetry; Pre-concentration; Periodic mesoporous organosilicas; 2,4,6-Trinitrotoluene (TNT)
资金
- NRL/Office of Naval Research
- US Strategic Environmental Research and Development Program (SERDP) [ER-1604]
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 mu L 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 m L 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. Published by Elsevier B.V.
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