Nitrate and organic N analyses with second-derivative spectroscopy

1992/06/01 by William G. Crumpton, Thomas M. Isenhart, Paul D. Mitchell · 16 citations
Environmental Science · Earth and Planetary Sciences · #Water Quality Monitoring and Analysis #Marine and coastal ecosystems #Water Quality Monitoring Technologies

paper · pdf · doi:10.4319/lo.1992.37.4.0907

Abstract

Simple and reliable procedures have been developed for analyses of NO3−, total N, and organic N in freshwaters. NO3− is determined by second-derivative UV spectroscopy. Total N and organic N are determined based on second-derivative analyses of NO3− following persulfate digestion. Resolution of organic N determinations was increased by using ion-exchange resins to remove NO3− from samples with high concentrations of NO3− prior to persulfate oxidation of the organic N.

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