The Reduced Strychnine Method for Determining Nitrates in Sea Water

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Abstract
A satisfactory procedure for the estimation of the dissolved nitrates in the waters of the strait of Georgia is described involving the use of a Duboscq colorimeter. Seven ml. of sample and reagent plus 3 drops of concentrated hydrochloric acid develop a satisfactory colour. A large number of small glass vials are used in place of the regular Duboscq cups. Standards are prepared from random samples of sea water. The proportionality between colour developed and nitrate concentration is practically linear up to 4.8 mg. of NO3 ion per litre but the factor is not 1. This necessitates an appreciable correction for all observed concentrations which differ greatly from that of the comparison standard.

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