Abstract
Abstract
The objective of this article is to present a new type of volatile organic compound (VOC) monitoring method based on semiconductor gas sensors. The concept has been developed to account for the continuous measurement difficulties, which result from a sensor memory effect and unpredictable variability of VOC concentration in a monitored environment. The method has been based on dynamic, short-term grab sampling and semiconductor gas sensor exposure in a predefined mode of operation. It allows for at-line monitoring with a time resolution better than 15 min. The measuring setup is compact and easy to operate. The method was tested in workplace conditions involving benzene and toluene emission during a waste stabilization process. Based on findings, the error of the method is no more than 16% of a measuring range. At the current stage of development, the method may be applied to semiquantitative monitoring, yet it has considerable improvement potential.
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