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Nitrate and organic N analyses with second‐derivative spectroscopy
Author(s) -
Crumpton William G.,
Isenhart Thomas M.,
Mitchell Paul D.
Publication year - 1992
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1992.37.4.0907
Subject(s) - persulfate , derivative (finance) , chemistry , nitrate , environmental chemistry , spectroscopy , organic matter , organic chemistry , catalysis , physics , quantum mechanics , financial economics , economics
Simple and reliable procedures have been developed for analyses of NO 3 − , total N, and organic N in freshwaters. NO 3 − is determined by second‐derivative UV spectroscopy. Total N and organic N are determined based on second‐derivative analyses of NO 3 − following persulfate digestion. Resolution of organic N determinations was increased by using ion‐exchange resins to remove NO 3 − from samples with high concentrations of NO 3 − prior to persulfate oxidation of the organic N.