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The method is specific for the measurement of nitrite ion as the nitrous acid has to be formed to achieve the diazatization reaction.
The reaction is extremely sensitive and a fairly high absorbance is obtained for 100 ppb which is often the legal limit of nitrite in drinking water.
The method is based upon the diazatization reaction of the nitrous acid, formed from the nitrite ions, with the sulfanilamide to form a brightly colored diazo dye.
Range: 0 to 500 ppb
Resolution: 0.001 ppb
Calibration: Zero and FS
Reagent 1: 0.4 ml / analysis
Reagent 2: 0.4 ml / analysis
Wavelength: 550 nm
Analysis Time: Less than 20 mins
INSTRAN - Online Nitrite Analyzer