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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

ABSTRACT

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.

Key Words: sample preservation • soluble reactive phosphorus

¹ These investigations are part of CSIRO Div. of Soils Proj. HC3 which is concerned with nutrient cycling in the Cooloola-Noosa area, 200 km north of Brisbane

² Experimental Officers, CSIRO Div. of Soils, St. Lucia, Queensland 4067, Australia.

Received for publication November 22, 1976.