1.1 Methods
Nitrate
with Tube Test
1 – 30 mg/l N
Insert the adapter for 16 mm Ø vials.
1. Open one white capped vial (Reagent A) and add
1 ml deionised water (this is the blank).
2. Open another white capped vial (Reagent A) and add
1 ml of the water sample (this is the sample).
3. Add the contents of one Vario Nitrate Chromotropic
Powder Pack straight from the foil into each vial.
4. Close the vials tightly with the caps and invert gently
several times (10 x) to mix the contents (Note 1).
5. Press [
] key.
Wait for a reaction period of 5 minutes.
6.
After the reaction period is finished proceed as follows:
7. Place the vial (the blank) in the sample chamber making
sure that the marks are
l
aligned.
8. Press ZERO key.
9. Remove the vial from the sample chamber.
10. Place the vial (the sample) in the sample chamber
making sure that the marks are
l
aligned.
11. Press TEST key.
The result is shown in the display in mg/l Nitrate.
prepare Zero
press ZERO
Zero accepted
prepare Test
press TEST
Countdown
5:00
start:
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