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Nitrate Measurements Using a Specific Ion Electrode in Presence of Nitrite¹

ABSTRACT

The presence of the nitrite anion (NO₂^-) may lead to a significant error in measuring NO₃-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 H₂SO₄. In this manner, nitrate levels can be read directly in concentrations ranging from 10 to 5000 ppm NO₃-N. The method is particularly useful in denitrification studies where HCO₃^- and CO₃^- anions as well as NO₂^- preclude direct NO₃-N measurements.

¹ Research sponsored by US Atomic Energy Commission under contract with Union Carbide Corporation. Publication No. 673, Environmental Sciences Division, Oak Ridge Nat. Lab.

² Soil Scientist, Environmental Sciences Division, Oak Ridge Nat. Lab., Oak Ridge, Tenn. 37830, and Graduate Assistant, Tennessee Tech. Univ., Cookeville, 38501.

Received for publication September 3, 1974. Accepted for publication November 5, 1974.