Soil Science Society of America Journal · 1975 · 16 citations · 0 references
Natural SciencesChemistryAnalytical ChemistryElectroanalytical MethodsElectrochemistryIon-selective ElectrodesNitrogen CycleNitrogen RemovalDenitrificationDenitrification ProcessesIon Selective Electrode AnalysisIon-selective Electrode SensorsNitrate Ion SensingNitrate-selective Electrodes
Abstract The presence of the nitrite anion (NO 2 ‐ ) may lead to a significant error in measuring NO 3 ‐N concentrations with a specific ion electrode. Interference by nitrite was found to be eliminated by complexing the nitrite with sulfanilamide in 0.01 N H 2 SO 4 . In this manner, nitrate levels can be read directly in concentrations ranging from 10 to 5000 ppm NO 3 ‐N. The method is particularly useful in denitrification studies where HCO 3 ‐ and CO 3 ‐ anions as well as NO 2 ‐ preclude direct NO 3 ‐N measurements.