Hydrazine
Hydrazine
Hydrazine_AccuVac_Other_PDA_Eng_Ody.fm Page 3 of 4
Interferences
Sample Collection, Storage and Preservation
Samples collected in glass or plastic bottles should be filled completely and
capped tightly. Avoid excessive agitation or exposure to air. Samples must be
analyzed immediately after collection and cannot be preserved for later analysis.
Accuracy Check
Standard Solutions Method
1. Prepare a 25-mg/L stock solution. Dissolve 0.1016 g of hydrazine sulfate in
1000 mL of oxygen-free deionized water. Prepare this stock solution daily.
2. Using Class A glassware, prepare a 0.1-mg/L (100-µg/L) hydrazine working
solution by diluting 4.00 mL of the 25-mg/L stock solution to 1000 mL with
deoxygenated deionized water. Prepare just before analysis. Perform either
hydrazine procedure as described above.
3. To adjust the calibration curve using the reading obtained with the 100-µg/L
standard solution, touch
Options on the current program menu. Touch
Standard Adjust.
4. Touch
On. Touch Adjust to accept the displayed concentration (the value
depends on the selected units). If an alternate concentration is used, touch the
number in the box to enter the actual concentration, then touch
OK. Touch
Adjust.
See Section 3.2.4 Adjusting the Standard Curve on page 40 for more information.
5. Place the blank into
the cell holder.
6. Touch Zero.
The display will show:
0 µg/L N
2
H
4
7. After the timer beeps,
place the prepared
sample in the cell holder.
8. Immediately after
the timer beeps, touch
Read. Results will appear
in µg/L N
2
H
4
.
Interfering Substance Interference Levels and Treatments
Ammonia No interference up to 10 mg/L. May cause a positive interference of up to 20% at 20 mg/L.
Highly colored or turbid
samples
Prepare a blank by oxidizing the hydrazine in a portion of the sample with a 1:1 mixture of
deionized water and household bleach. 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 2, in place of deionized
water, to prepare the blank.
Morpholine No interference up to 10 mg/L.
Zero Read
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