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The utilization of quartz microbalance for detection of toxic compounds
Králová, Miroslava ; Opekar, František (referee) ; Jelínek, Ivan (advisor)
v angličtině: This work is aimed at the study of sensor response of quartz microbalance towards biologically active substances such as glycerin and toxic substances, namely ethylene glycol, methanol and acetonitrile in liquid phase. These toxic organic compounds are widely used in chemical industry as solvents or anti-freeze components. Glycerin is commonly utilized in cosmetic industry as a moisturizer. As human can easily get into contact with these compounds, they should be easily detectable. If tested senzor proves to be suitable for detecting these substances, it will be possible to follow preliminary results and develop the device for practical industrial usage.
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A Capacitive Detector for Determination of Organic Solvents in Water Solutions - the Effect of Inorganic Electrolytes.
Fišarová, Michaela ; Štulík, Karel (referee) ; Opekar, František (advisor)
The effect of inorganic electrolytes on the determination of relative permittivity and concentration of water solutions of 1,4 dioxane was studied in this work. The method used was dielectrimetry, and NaCl, KCl, CsCl and LiCl at various concentrations were tested electrolytes. The interfering effect of these electrolytes was found for concentrations above 0.05 mmol l-1. It was also found that the interfering factor is purely the solution conductivity independent on the ion kind. The measurements were carried out with both the planar and the tubular detection cell having the electrodes insulated from the solution. The cell was connected to the differentiator (the voltage is the analytical signal) or multivibrator (the frequency is the analytical signal). A good agreement between experimental results and the modeled calculation for the detector with differentiator was also obtained.
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