Improvement of Determination of Trace Amount of Nitrite in Water by Primary-Secondary Wavelengths Sperctrophotometry

Abstract

In acidic solution and in the presence of p-aminobenzenesulfonic acid,
the reaction between nitrite (NO₂^- ) and  α-naphthylamine was applied for
the improvement in determination of NO₂^- in water by primary-secondary
wavelengths spectrophotometry (PSWS) which was a new analytical
method to give higher precision and sensitivity than ordinary
spectrophotometry. The detection limit of NO₂^--N was equal to 0.002 mg/L.
Results showed that for the analysis of practical samples the relative standard
deviations are less than 8% and the recovery rate of NO₂^- is between
95.0 and 107%.