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This article in JEQ

  1. Vol. 7 No. 1, p. 137-141
    Received: Nov 22, 1976

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The Automatic Determination of ppb Levels of Ammonia, Nitrate plus Nitrite, and Phosphate in Water in the Presence of Added Mercury (II) Chloride1

  1. J. O. Skjemstad and
  2. R. Reeve2



Three automated procedures are reported for the simultaneous determination of ammonia, nitrate plus nitrite, and phosphate in water. The ammonia determination is based on the salicylate-dichloroisocyanurate reaction in the presence of nitroprusside preceded by in-line distillation. Nitrate plus nitrite is estimated by using an in-line copperized cadmium reductor, diazotizing the nitrite with sulphanilamide, and coupling with N-1-naphthylethylenediamine. Phosphate is estimated by reaction with molybdate and reduction to molybdenum blue with ferrous ammonium sulphate. Mercury (II) chloride used as a preservative does not interfere with the methods and good precision at ppb levels can be obtained.

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