Abstract
A new continuous flow procedure is proposed for the simultaneous determination of nitrate and ammonia in water. Ammonia is fluorometrically determined with o-phthalaldehyde reagent, and nitrate is determined after reducing it to ammonia in alkaline medium by titanium-(III) chloride. The ammonia generated in alkaline sample solution is separated with a tubular microporous PTFE membrane. Nitrite stoichiometrically interferes with the present method but can be masked by sulfanilic acid. Detection limits (S/N = 3) for nitrate and ammonia were 1.8 x 10/sup -7/ and 1.8 x 10/sup -8/ M, respectively. Nitrate and ammonia in rivers were simultaneously determined with satisfactory results. 12 references, 3 figures, 4 tables.
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