Determination of nitrate in sea water by cadmium-copper reduction to nitrite
Wood, E.D. and Armstrong, F.A.J. and Richards, F.A. (1967) Determination of nitrate in sea water by cadmium-copper reduction to nitrite. Journal of the Marine Biological Association of the United Kingdom, 47 (1). pp. 23-31.
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An accurate, dependable determination of 0-60 ,ug-at./l. of NOs -N in sea water has been developed. The sample is treated with tetrasodium ethylenediaminetetraacetate solution and passed through a column of copperized cadmium filings. A nearly quantitative reduction of nitrate to nitrite results. Nitrite is then determined by a diazotization method. Neither sulphide nor high nitrite concentrations interferes. Approximately eight samples per hour per column can be analysed with a standard deviation of 0'12 ,ug-at./l. at the 20 ,ug-at./l. level.
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