Biosensor determination of the microscale distribution of nitrate, nitrate assimilation, nitrification, and denitrification in a diatom-inhabited freshwater sediment

Article Abstract:

Research was conducted to examine the vertical and temporal distribution of NO3- in diatom-covered sediment during light-dark cycles using a novel microscale NO3- biosensor characterized by absence of interference from chemical species other than NO2- and N2O. Vertical distribution of NO3- assimilation, nitrification and denitrification was measured from the calculated steady-state NO3- profiles by diffusion reaction models. Results show that the stimulatory effect on nitrification by illumination was caused by algal production of O2.NH4+.

Nitrification

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Kinetic parameters of denitrification in a river continuum

Article Abstract:

Acetylene blockage method was used to examine impact of nitrate concentration on the denitrification rate and N2O production in intact sediment cores from a river continuum. An increase in denitrification rate was observed after the addition of nitrate in the overlying water. A Michaelis-Menten-type curve was shown and a strong response to nitrate addition was observed in the denitrification rate of intact sediment.

River sediments, Acetylene, Nitrogen compounds

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Bacterium-based NO2(super -) biosensor for environmental applications

Article Abstract:

A sensitive NO2(super -) biosensor based on bacterial reduction of NO2(super -) to N2O and subsequent detection of the N2O by a built-in electrochemical N2O sensor is discussed. The NO2(super -) biosensor was successfully used for long-term online monitoring in wastewater.

Science & research, Industrial Gas Manufacturing, Industrial gases, Nitrogen Dioxide, Methods, Oxidation-reduction reaction, Oxidation-reduction reactions, Chemical properties

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