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

被引：11

作者：

Kim, Byoung Chul ^{[1
]}

Yamamoto, Takuji ^{[2
]}

Kim, Young Han ^{[1
]}

机构：

[1] Dong A Univ, Dept Chem Engn, Pusan 604714, South Korea

[2] Univ Hyogo, Dept Chem Engn, Himeji, Hyogo 6712201, Japan

来源：

SENSORS | 2014年 / 14卷 / 01期

关键词：

quartz crystal microbalance; water content in ethanol; PVA-coated sensor; COOLING CRYSTALLIZATION; QCR SENSORS; RESONATOR; PLASMA; FILMS; SENSITIVITY; OSCILLATOR; BIOSENSOR; MIXTURE;

D O I：

10.3390/s140101564

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

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.

引用

页码：1564 / 1575

页数：12

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