1.1 Methods
Sodium hypochlorite (Soda bleaching lye)
with Tablet
0.2 – 16 % w/w NaOCl
Preparation:
1. Fill a 5 ml plastic syringe with the test solution, ensuring
that all air bubbles are expelled. Transfer the 5 ml test
solution slowly into a 100 ml beaker and dilute to the
100 ml mark with chlorine-free water. Mix thoroughly.
2. Fill a 5 ml plastic syringe with the diluted test solution
(step 1) to the 1 ml mark, ensuring that all air bubbles
are expelled. Transfer the 1 ml test solution slowly into
a 100 ml beaker and dilute to the 100 ml mark with
chlorine-free water. Mix thoroughly.
Performing test procedure:
1. Fill a clean vial (24 mm Ø) with 10 ml of the prepared
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.
5. Add one CHLORINE HR (KI) tablet straight from the
foil to the water sample and crush the tablet using a
clean stirring rod.
6. Add one ACIDIFYING GP tablet straight from the foil
to the same water sample and crush the tablet using a
clean stirring rod.
7. Close the vial tightly with the cap and swirl several times
until the tablets are dissolved.
prepare Zero
press ZERO
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