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Sensors 2014, 14(1), 1564-1575; doi:10.3390/s140101564

In-Line Measurement of Water Content in Ethanol Using a PVA-Coated Quartz Crystal Microbalance

1
Department of Chemical Engineering, Dong-A University, Pusan 604-714, Korea
2
Department of Chemical Engineering, University of Hyogo, Himeji 671-2201, Japan
*
Author to whom correspondence should be addressed.
Received: 4 November 2013 / Revised: 18 December 2013 / Accepted: 9 January 2014 / Published: 16 January 2014
(This article belongs to the Section Chemical Sensors)
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Abstract

An in-line device for measuring the water content in ethanol was developed using a polyvinyl alcohol (PVA)-coated quartz crystal microbalance. Bio-ethanol is widely used as the replacement of gasoline, and its water content is a key component of its specifications. When the PVA-coated quartz crystal microbalance is contacted with ethanol containing a small amount of water, the water is absorbed into the PVA increasing the load on the microbalance surface to cause a frequency drop. The determination performance of the PVA-coated microbalance is examined by measuring the frequency decreases in ethanol containing 2% to 10% water while the ethanol flows through the measurement device. The measurements indicates that the higher water content is the more the frequency reduction is, though some deviation in the measurements is observed. This indicates that the frequency measurement of an unknown concentration of water in ethanol can be used to determine the water content in ethanol. The PVA coating is examined by microscopy and FTIR (Fourier transform infrared) spectroscopy.
Keywords: quartz crystal microbalance; water content in ethanol; PVA-coated sensor quartz crystal microbalance; water content in ethanol; PVA-coated sensor
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Kim, B.C.; Yamamoto, T.; Kim, Y.H. In-Line Measurement of Water Content in Ethanol Using a PVA-Coated Quartz Crystal Microbalance. Sensors 2014, 14, 1564-1575.

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