A method based on the principle of flow injection analysis is described for the determination of nitrate and nitrite. A minicolumn of copperized cadmium is used which reduces nitrate to nitrite, which in turn is diazotized with 4-aminobenzoic acid and 8-hydroxyquinoline. The resulting azo compound is quantified at 485 nm. The procedure is applied to potable water samples. The sampling rate for both species was 60 hr-1. The relative standard deviation was 0.8% for nitrite and 1.0% for nitrate.
M A SIDDIQUI ,M YAQOOB ,M MASOOM ,
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