Urea, With Tablet And Liquid Reagent; 2.5 Mg/L - Aqualytic AL200 Mode D'emploi

Methods
GB
Urea
Ur 1
with Tablet and Liquid Reagent
0.1 – 2.5 mg/l (NH ) CO
2 2
Fill a clean vial (24 mm Ø) with 10 ml of the water sample and
0.0.0
perform zero calibration (see "Operation").
In the presence of free Chlorine (HOCl), add one UREA PRETREAT
tablet straight from the foil and crush the tablet using a clean stirring
rod (Note 10).
Close the vial tightly with the cap and swirl several times to mix the
contents.
Fill the vial with drops of the same size by holding the bottle vertically
and squeeze slowly:
2 drops of UREA Reagent 1
Close the vial tightly with the cap and invert several times to mix the
contents.
Add 1 drop of UREA Reagent 2 (Urease) to the same water sample.
Close the vial tightly with the cap and invert several times to mix the
contents.
Wait for a reaction period of 5 minutes.
Add one AMMONIA No. 1 tablet straight from the foil to the pre-
pared water sample and crush the tablet using a clean stirring rod.
Add one AMMONIA No. 2 tablet straight from the foil to the same
water sample and crush the tablet using a clean stirring rod.
Close the vial tightly with the cap and swirl gently several times until
the tablets are dissolved.
Place the vial in the sample chamber making sure that the marks
are aligned.
Wait for a reaction period of 10 minutes.
! Zero
(Countdown can be activated, see page 33)
Test
Ur1
The method symbol flashes for approx. 3 seconds.
RESULT
The result is shown in the display in mg/l Urea.
Tolerances: ± 0.2 mg/l Urea
Notes: see page 45
43
AL200_8 12/2016