Detection of volatile amines using a quartz crystal with gold electrodes


A quartz crystal with gold electrodes is used to detect and quantify volatile amines. The magnitude of the observed frequency decrease is highly dependent on the roughness of the surface of the gold electrodes and sensitivity can be increased by rubbing them with alumina. Water increases the observed signal, leading to important errors in the amine quantification. However, the presence of minor amounts of water is readily detected, as the plotted frequency signal shows a marked distortion. The effect of water on the interaction between amine and gold was studied by infrared spectroscopy. (C) 1999 Elsevier Science S.A. All rights reserved.



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Chemistry; Electrochemistry; Instruments & Instrumentation


Gomes, MTSR; Verissimo, MIS; Oliveira, JABP

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