Abstract
AbstractError sources associated with the spectrophotometric determination of low levels (e.g. 90%) of nitrate from the marine lake sediments studied was achieved with 15 min mixing with 0.1 M NH4CI, using a sediment to extractant ratio of 1:30. The nitrate in the extracts was determined by reducing it to nitrite (using Cd powder), with subsequent colour development based on the addition of sulfanilic acid and N-1-naphthyl-ethylenediamine dihydrochloride. The reduction step was sensitive to the experimental conditions used, but was near quantitative using 0.1 M NH4CI extracts. (Much lower transformation levels were observed when the nitrate solutions contained KCI or CaSO4, or when Zn powder was u...
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