Denitrification Studies with 13 N-Labeled Nitrate

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Abstract
Nitrate labeled with 13N (13NO3–) was produced in a cyclotron by the 16O(p, α)13N reaction with protons having energies of 14.5 million electron volts. The 13NO3– was used as a tracer for direct quantitative measurements of denitrification rates in soils from flooded rice fields. The 13N technique provides a new tracer method for the measurement of denitrification rates in natural systems over short time intervals, without changing the concentration of NO3–in the system.