Hach DR2400 - Page 451

Nitrite
Nitrite
Nitrite_AVPP_Low_DAZ_Eng_Ody.fm Page 5 of 6
Sensitivity
See Section 3.4.5 Sensitivity on page 44 for more information.
Summary of Method
Nitrite in the sample reacts with sulfanilic acid to form an intermediate
diazonium salt. This couples with chromotropic acid to produce a pink colored
complex directly proportional to the amount of nitrite present. Test results are
measured at 507 nm.
Required Reagents
Quantity Required
Description Per Test Unit Cat. No.
NitriVer
®
3 Nitrite Reagent Powder Pillows ........................................1 pillow........... 100/pkg.............21071-69
or
NitriVer
®
3 Nitrite Reagent AccuVac
®
Ampul.....................................1 ampul........... 25/pkg...............25120-25
Required Apparatus
Beaker, 50-mL............................................................................................1 ....................... each.................... 500-41H
Sample Cells, 10-mL, w/cap...................................................................2 ....................... 6/pkg.................24276-06
Required Standards
Sodium Nitrite, ACS .......................................................................................................... 454 g.....................2452-01
Water, deionized ................................................................................................................. 4 liters ....................272-56
Program Portion of Curve ∆Abs ∆Concentration
371 Entire range 0.010 0.002 mg/L NO
2
–
–N
375 Entire range 0.010 0.002 mg/L NO
2
–
–N