Abstract
Procedures are described for gasometric determination of nitrate, nitrite, and mixtures of nitrate and nitrite with the Van Slyke-Neill manometric apparatus. Nitrate is measured by the nitric oxide evolved by the reaction with mercury and sulfuric acid: 2HNO 3 + 6Hg + 3H 2SO 4 = 2NO + 3HgSO 4 + 4H 2O. Nitrite is measured by the N 2 evolved by reaction with sulfamic acid: HSO 3 · NH 2 + HNO 2 = H 2SO 4 + N 2 + H 2O. In mixtures of nitrate and nitrite, the total nitrate plus nitrite nitrogen is determined by adding permanganate to oxidize the nitrite to nitrate and then applying the nitrate method. Nitrite is determined in a separate sample by the reaction with sulfamic acid and nitrate N is calculated as total N minus nitrite N.
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