Determination of ammonia in the air using piezoelectric resonance sensors coated with humic acids |
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Authors: | A A Zvyagin D V Nenakhov S N Korchagina A V Shaposhnik V V Kotov V A Yukish |
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Institution: | (1) Taras Shevchenko Kyiv National University, Vul. Volodymyrs’ka, 64, Kyiv, 01601, Ukraine |
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Abstract: | Natural macromolecular compounds, humic acids (HA), have been used to form gas-sensitive layers of piezoelectric resonance gravimetric sensors. HA have been extracted from
humus using alkaline extraction and purified by electrodialysis through ion-exchange membranes. Species have been deposited
onto the electrode surface of piezoelectric quartz resonators by air-spraying their aqueous solutions, the layer thickness
being 100–200 nm. In determining ammonia with the sensor obtained on the basis of purified HA species, the detection limit
is ∼10 mg/m3. Gas-sensitive layers on the basis of humic acids are more stable as compared to the conventionally used gas-sensitive layers
based on pyridoxine hydrochloride or ascorbic acid. |
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