Determination of Nitrite and Nitrate Ions in Natural Waters Using Aromatic Ortho Diamines as Reagents,

摘要

1,8-diaminonaphthalene and 8aromatic orthodiamines were evaluated for suitability as reagents for the determination of nitrite nitrogen. The aromatic orthodiamines react to form triazoles determinable by fluorometric or spectrophotometric methods. Of the reagents evaluated, 2,3-diaminofluorene (2,3-DAF) and 5-(3,4-diaminophenyl)-2,1,3-benzoselenadiazole (DABSe) were selected for analytical use. Detection limits for nitrite N were 1,5,and 1microgram per liter for the DABSe,aqueous 2,3-DAF,and DCE-2,3-DAF methods. Interferences from high concentrations of manganese dioxide and Fe (III) were eliminated by filtration and ion exchange treatements. Both methods were compatible with nitrate determination based on reduction of nitrate to nitrite with a Cd-Hg column.