Real-life application of a QCM-based e-nose: quantitative characterization of different plant-degradation processes |
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Authors: | Peter A Lieberzeit Abdul Rehman Bita Najafi Franz L Dickert |
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Institution: | 1.University of Vienna,Department of Analytical Chemistry and Food Chemistry,Vienna,Austria |
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Abstract: | Continuous surveillance of composting processes would enable a feedback loop to be obtained for both analysis and process
control. For this purpose, we designed e-noses based on a six-electrode quartz-crystal microbalance (QCM) array coated with
affinity materials and molecularly imprinted polymers (MIP). They enable quantitative monitoring of volatile organic compounds
(VOCs) emitted directly in a compost bin and are highly suitable tools for achieving on-line characterization of the degradation
processes occurring. During grass and pine composting (duration 14 days and 40 days, respectively), we observed concentrations
of up to 250 ppm of esters, 700 ppm of alcohols, 250 ppm of terpenes, and 90% relative humidity directly on-line with such
a system and could validate the data off-line by GC-MS. The sensor also gave direct insight into the differences between the
two composting batch types. Besides duration, during grass composting larger amounts of alcohols are emitted whereas relative
amount of terpenes is twice as high for pine composting. Detailed correlation of the sensor and the GC-MS data allows approximate
estimation of the sensitivity of the sensor materials towards analyte classes such as, e.g., aliphatic alcohols or terpenes.
Figure Mass sensitive sensor arrays coated with different molecularly imprinted and affinity materials are a highly suitable tool
for quantitatively monitoring solvent patterns during composting procedures on-line in a composter headspace.
Dedicated to Professor Udo Brinker on the occasion of his 65th birthday. |
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Keywords: | Sensor array QCM Composting Molecular imprinting GC-MS |
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