Hach DR/700 Procedures Manual page 361

BROMINE,
Chlorine, iodine, ozone and oxidized forms of manganese and
chromium also may react and show as bromine. Compensate for the
effects of manganese (Mn
6 to 7 as described above. Add 3 drops of 30-g/L potassium iodide to
25 mL of sample, mix and wait one minute. Add 3 drops of 5 g/L
Sodium Arsenite and mix. Analyze this sample as described above. (If
chromium is present, allow exactly the same reaction period with DPD
for both analyses.) Subtract the result of this test from the original
analysis to obtain the accurate bromine result.
DPD Total Chlorine Reagent Powder Pillows and AccuVac Ampuls
contain a buffer formulation which will withstand high levels
(>1000 mg/L) of hardness without interference.
SUMMARY OF METHOD
Bromine reacts with DPD (N,N-diethyl-p-phenylenediamine) to form a
red color which is proportional to the total bromine concentration.
REQUIRED REAGENTS (Using Powder Pillows)
Description
DPD Total Chlorine Reagent
Powder Pillows, 10 mL . . . 1 pillow . . . 100/pkg . . . . . . . 21056-69
REQUIRED REAGENTS (Using AccuVac Ampuls)
DPD Total Chlorine Reagent
AccuVac Ampuls . . . . . . . . 1 ampul . . . . 25/pkg . . . . . . . . 25030-25
REQUIRED APPARATUS (Using Powder Pillows)
Clippers, for opening
powder pillows . . . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . . . 968-00
DR/700 Filter Module
Number 52.01. . . . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . 46252-00
REQUIRED APPARATUS (Using AccuVac Ampuls)
Adapter, AccuVac Vial . . . . . . 1 . . . . . . . . . each . . . . . . . . . . 46025-00
Adapter, AccuVac Vial,
DR/700 . . . . . . . . . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . 46025-00
Beaker, 50 mL . . . . . . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . . . 500-41
DR/700 Filter Module
Number 52.01. . . . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . 46252-00
d
continue
4+
) or chromium (Cr
Quantity
Per Test
52-35
6+
), by adjusting the pH to
Unit Cat. No.