Detection of polycyclic aromatic hydrocarbons using quartz crystal microbalances
Stanley, S., Percival, C.J., Auer, M., Braithwaite, A., Newton, M.I., McHale, G. and Hayes, W. (2003) Detection of polycyclic aromatic hydrocarbons using quartz crystal microbalances. Analytical Chemistry, 75 (7). pp. 1573-1577. ISSN 0003-2700
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To link to this article DOI: 10.1021/ac0257546
A chemically coated piezoelectric sensor has been developed for the determination of PAHs in the liquid phase. An organic monolayer attached to the surface of a gold electrode of a quartz crystal microbalance (QCM) via a covalent thiol-gold link complete with an ionically bound recognition element has been produced. This study has employed the PAH derivative 9-anthracene carboxylic acid which, once bound to the alkane thiol, functions as the recognition element. Binding of anthracene via pi-pi interaction has been observed as a frequency shift in the QCM with a detectability of the target analyte of 2 ppb and a response range of 0-50 ppb. The relative response of the sensor altered for different PAHs despite pi-pi interaction being the sole communication between recognition element and analyte. It is envisaged that such a sensor could be employed in the identification of key marker compounds and, as such, give an indication of total PAH flux in the environment.