Nitrate
with Tablet and Powder
0.08 – 1 mg/l N
1. Fill a clean vial (24 mm Ø) with 10 ml of the water
sample, close tightly with the cap.
2. Place the vial in the sample chamber making sure that
the marks are aligned.
3. Press ZERO key.
4. Remove the vial from the sample chamber and empty
the vial.
5. Fill the Nitrate test tube with 20 ml of the water
sample.
6. Add 1 level spoon of Nitrate Test powder.
7. Close the tube tightly with the cap and swirl vigorously
for one minute.
8. Add one NITRATE TEST tablet straight from the foil
to the water sample.
9. Close the tube tightly with the cap and swirl vigorously
for one minute.
10. Stand the tube upright and after the reducing agent
has settled to the bottom, gently invert it three to four
times so as to complete the flocculation of the reducing
agent. Then let the tube stand for a further 2 minutes.
Open the tube and wipe around the top of the tube with
a clean tissue to remove any residuals of the reducing
agent.
11. Carefully decant 10 ml of the treated solution into
the vial (24 mm Ø) used for zeroing, ensuring that no
reducing agent is carried over.
12. Add one NITRITE LR tablet straight from the foil to the
water sample and crush the tablet using a clean stirring
rod.
6
0
2
prepare Zero
press ZERO
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