Hach DR/700 Procedures Manual page 299

NITRITE, LR,
Very high levels of nitrate (100 mg/L nitrate as N or more) appear to
undergo a slight amount of reduction to nitrite, either spontaneously or
during the course of the test. A small amount of nitrite will be found at
these levels.
SUMMARY OF METHOD
Nitrite in the sample reacts with sulfanilic acid to forms an intermediate
diazonium salt. This couples with chromotropic acid to produce a pink
colored complex directly proportional to the amount of nitrite present.
REQUIRED REAGENTS (Using Powder Pillows)
Description
NitriVer 3 Nitrite Reagent
Powder Pillows,
10 mL sample . . . . . . . . . . . 1 pillow . . . . 100/pkg . . . . . . . 21071-69
REQUIRED REAGENTS (Using AccuVac Ampuls)
NitriVer 3 Nitrite Reagent
AccuVac Ampul . . . . . . . . . 1 ampul . . . 25/pkg . . . . . . . . 25120-25
REQUIRED APPARATUS (Using Powder Pillows)
Clippers, for opening
powder pillows . . . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . . 968-00
DR/700 Filter Module
Number 50.01. . . . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . 46250-00
REQUIRED APPARATUS (Using AccuVac Ampuls)
Adapter, AccuVac Vial . . . . . . 1 . . . . . . . . . each . . . . . . . . . . 46025-00
Beaker, 50 mL . . . . . . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . . 500-41
OPTIONAL REAGENTS
Mercuric Chloride Solution. . . . . . . . . . . . . . 100 mL . . . . . . . 14994-42
NitriVer 3 Nitrite Reagent
Powder Pillows, 25 mL sample . . . . . . . . 50/pkg . . . . . . . . 14065-66
Sodium Nitrite, ACS . . . . . . . . . . . . . . . . . . . 454 g . . . . . . . . . . 2452-01
Water, demineralized . . . . . . . . . . . . . . . . . . . 4 L . . . . . . . . . . . . 272-56
continued
Quantity
Per Test
50-49
Unit Cat. No.