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  • Title: On-line detection of atmospheric formaldehyde by a conductometric biosensor.
    Author: Vianello F, Boscolo-Chio R, Signorini S, Rigo A.
    Journal: Biosens Bioelectron; 2007 Jan 15; 22(6):920-5. PubMed ID: 16678399.
    Abstract:
    Atmospheric formaldehyde (CH(2)O) was detected under continuous flow conditions by an on-line system comprising of a wet scrubber for a continuous transfer of the pollutant to an aqueous solution, a micro-reactor containing immobilized formaldehyde dehydrogenase (FDH) and a conductometric transducer. By this system atmospheric formaldehyde concentrations in the range 0.05-2 ppm were detected with a sensitivity of 20 microS/ppm. In this concentration range the immobilized enzyme oxidized all the sampled formaldehyde molecules to formic acid, avoiding cumbersome calibration procedures. The operational stability of the biosensor was at least 3 months, working continuously 10 h/day at room temperature.
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