Abstract
Traces of nitrite in river water can be determined by extraction spectrophotometry. Nitrite in 100 ml of sample water at pH 1.5–3.0 diazotizes p-aminoacetophenone, which is then coupled with m-phenylenediamine at the same pH. The 2,4-diamino-4'-acetyl-azobenzene formed is extracted into 5 or 10 ml of toluene at pH 9 and the absorbance is measured at 450 nm. The molar absorptivity is about 2.3·lO 4 l mol −1 cm −1. The ions normally present in river water do not interfere. The nitrite contents in river waters in Okayama Prefecture, Japan, are 1–30 P.P.b.
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