Abstract
High concentration of nitrite in solution can be determined conveniently by a differential spectrophotometric method by the use of an absorption peak at 355 mμ. The concentration of nitrite (C2) is obtained from the concentration of the reference (C1) and the absorbancy of sample solution Aγ by the following equation :
C2=C1+1/0.47×Aγ
As for the reference solution, the concentration C1=NO2- 6 mg/ml is recommended as an optimum, and with this method Beer's law holds to NO2-7.5 mg/ml. The method is rapid and needs no special reagent. As much as 10 times the weight of nitrate does not interfere.
