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We have used a quadrupole mass spectrometer with a gas-permeable membrane inlet for continuous measurements of the production of N2 O and N2 from nitrate or nitrite by cell suspensions ofParacoccus denitrificans . The use of nitrate and nitrite labeled with15 N was shown to simplify the interpretation of the results when these gases were measured. This approach was used to study the effect of pH on the production of denitrification intermediates from nitrate and nitrite under anoxic conditions. The kinetic patterns observed were quite different at acidic and alkaline pH values. At pH 5.5, first nitrate was converted to nitrite, then nitrite was converted to N2 O, and finally N2 O was converted to N2 . At pH 8.5, nitrate was converted directly to N2 , and the intermediates accumulated to only low steady-state concentrations. The sequential usage of nitrate, nitrite, and nitrous oxide observed at pH 5.5 was simulated by using a kinetic model of a branched electron transport chain in which alternative terminal reductases compete for a common reductant.

Mass Spectrometric Studies of the Effect of pH on the Accumulation of Intermediates in Denitrification by Paracoccus denitrificans