Thermo Scientific AQUAfast AQ3700, User Manual

Page: 38 / 264

3 Thermo Scientific Orion AQUAfast AQ3700 Colorimeter User Guide
1.1 Methods
Chloramine (Mono)
and Free Ammonia
with Powder Pack
and Liquid Reagent
0.04 – 4.50 mg/l Cl
2
0.01 – 0.50 mg/l NH
4
-N
Use two clean vials (24 mm Ø) and mark one as the
chloramine vial, the other as the ammonia vial.
1. Fill both vials (24 mm Ø) with
10 ml of water
sample
, close tightly with the cap.
2. Place the chloramine vial in the sample chamber
making sure that the marks are aligned.
3. Press
ZERO
key.
4. Remove the vial from the sample chamber.
5. Add the contents of one Monochlor FRGT
Powder Pack
straight from the foil into the
chloramine vial.
6. Close the vial tightly with the cap and swirl several times
to mix the contents (approx. 20 seconds).
7. Add
1 drop of Free Ammonia Reagent Solution
into the ammonia vial (Note 1).
8. Close the vial tightly with the cap and invert several
times to mix the contents.
9. Place the chloramine vial in the sample chamber
making sure that the marks are aligned.
6 3
1 2
3 4
prepare Zero
press ZERO