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The construction of a microsensor which can be used to measure O2 and N2 O simultaneously is described. The microsensor exhibited a linear response to both O2 and N2 O, and the response to N2 O was independent of the O2 concentration and vice versa. The N2 O detection limit of a microsensor with a tip diameter of 20 μm was around 1 μmol liter−1 . The signals for O2 and N2 O were affected by hydrogen sulfide, but other interfering agents were not observed in the biofilms and sediments analyzed. Microprofiles of O2 and N2 O were measured in a biofilm which was exposed to acetylene to block the N2 O reductase activity of denitrifying bacteria. O2 penetrated about 0.5 mm into the biofilm and was not affected by acetylene, but the N2 O concentration at 1.4 mm depth increased from 32 to 411 μmol liter−1 after the addition of the inhibitor. The shape of the N2 O profile after the addition of acetylene showed that denitrification (denitrifying activity) was detectable in all anoxic layers of the biofilm.

Combined Oxygen and Nitrous Oxide Microsensor for Denitrification Studies