Chapter 5
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Orion AQUAfast Reagent Chemistry Instructions for Orion AquaMate
Thermo Scientific
Orion AquaMate Spectrophotometer User Manual
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81
AC2030 Hydrazine Powder Test
Dimethylamino-benzaldehyde Method
0.05 – 0.5 mg/l N
2
H
4
1.
Load and run the AC2030 method.
2.
Fill a clean AQUAfast 24mm round vial, Cat. No. AC2V24, with 10 ml of sample. Close the
vial tightly with the cap. Wipe the exterior of the vial.
3.
Place the vial into the holder in the sample chamber and close the chamber door.
4.
Press the Measure Blank function key to measure the blank.
5.
Open the sample chamber door and remove the vial from the holder.
6.
Add one gram (1 g) Hydrazine Powder to the vial.
7.
Close the vial tightly with the cap and swirl or invert several times to mix the contents. Wipe
the exterior of the vial.
8.
Wait for a reaction period of 10 minutes.
9.
The slight turbidity that occurs when the reagent is added must be removed by filtration
10.
Place the vial into the holder in the sample chamber and close the chamber door.
11.
Press the Measure Sample function key to display the result in mg/l hydrazine.
Notes:
•
If the water sample is cloudy, you must filter it before performing the blank measurement.
•
The temperature of the water sample should not exceed 21 °C.
•
Using the hydrazine spoon: 1 g is equivalent to one level spoon.
•
Qualitative folded filter papers for medium precipitates are recommended.
•
In order to check whether the reagent has aged (if it has been stored for a lengthy period),
perform the test as described above using tap water. If the result is above the detection
limit of 0.05 mg/l, you should only use the reagent with reservations, as there may be a
major deviation in results.