A rapid technique for determination of nitrate and nitric acid by acid reduction and diazotization at elevated temperature.

摘要: A rapid technique for determination of nitrate by acid reduction and diazotization at elevated temperature has been standardized. The is based on quantitative sulfanilamide incubation in boiling water bath 3, 5 or 10 min presence high concentration HCl, ca. 64.5%. diazotized coupled room to N-1-(naphthyl)-ethylenediamine dihydrochloride, the chromophore evaluated spectrophotometrically 540 nm. provides linear estimate over test range 0.5 through microg N mL(-1) sample with all time periods using alkali nitric as sources anion. Urea treatment enables selective nitrite overall 99+/-1% recovery, without affecting (P>0.1) its regression coefficient. obvious advantages metal-reduction technique. It simple, rapid, nitrite, an inexpensive method routine detection 0.5-10 sample. Besides, opportunity detect low 35 microM even other acids.