45-28
HYDRAZINE, continued
representative lots of testing reagents. Testing 300 µg/L N
2
H
4
concentration samples, the standard deviation was ±3.4 µg/L N
2
H
4
.
Testing zero concentration samples, the limit of detection was 2.4 µg/L
N
2
H
4
. The limit of detection was calculated as three times the standard
deviation when testing zero concentration samples (Adapted from
Analytical Chemistry, 1980, 52, 2242-2249).
INTERFERENCES
For highly colored or turbid samples, prepare a blank by oxidizing the
hydrazine in a portion of the sample. This can be accomplished with a
1:1 mixture of demineralized water and a household bleach such as
Clorox. Add one drop of the mixture to 25 mL of sample in a graduated
mixing cylinder and invert to mix. Use this solution in Step 4, in place
of demineralized water, to prepare the blank. There are no other
common interferences.
Ammonia does not interfere up to 10 mg/L. At 20 mg/L, a positive error
of up to 20% may occur.
Morpholine does not interfere up to 10 mg/L.
SUMMARY OF METHOD
Hydrazine in the sample reacts with the p-dimethyl-aminobenzaldehyde
from the HydraVer 2 Reagent to form a yellow color which is
proportional to the hydrazine concentration.
REQUIRED REAGENTS
Quantity
Description Per Test Unit Cat. No.
HydraVer 2
Hydrazine Reagent. . . . . . . . 1 mL . . . . . . . 100 mL* MDB . . . 1790-32
Water, demineralized . . . . . . . 25 mL . . . . . 4 L . . . . . . . . . . . . 272-56
REQUIRED APPARATUS
Cylinder, graduated, 25 mL . . . 1 . . . . . . . . . .each . . . . . . . . . . . . 508-40
DR/700 Filter Module
Number 45.01. . . . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . 46245-00
OPTIONAL REAGENTS
Hydrazine Sulfate, ACS . . . . . . . . . . . . . . . .100 g . . . . . . . . . . 742-26
To Next Page
Loading...
