Nitrite Nitrogen Calculator
Definition: Nitrite nitrogen is determined colorimetrically by developing a reddish-purple azo dye and measuring its absorbance. Sample concentration is obtained from the laboratory calibration curve.
C = [(A − b) / m] × DF
C = NO₂⁻-N concentration
A = sample absorbance
b = calibration curve intercept
m = calibration curve slope
DF = dilution factor
Method basis: Standard Methods for the Examination of Water and Wastewater, Method 4500-NO₂⁻ B — Colorimetric Method. Concentration is determined from a standard calibration curve.