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Nitrate Measurements Using a Specific Ion Electrode in Presence of Nitrite
Author(s) -
Francis C. W.,
Malone C. D.
Publication year - 1975
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1975.03615995003900010038x
Subject(s) - nitrite , nitrate , chemistry , inorganic chemistry , ion , electrode , denitrification , ion selective electrode , environmental chemistry , nitrogen , selectivity , biochemistry , organic chemistry , catalysis
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.