Water I.D. Primelab 2.0, Manual

Page: 56 / 301

(01)
Active Oxygen
0.0 - 40.0 mg/l (MPS)
Tablet
Internal Name: 01-Act-oxi-MPS-tab
10ml
DPD N°4 Photometer (TbsPD4)
Measurement procedure:
1 Fill 10 ml test water into a clean 24 mm cuvette.
2 Screw the lid back on the cuvette.
3 Insert the cuvette into the PrimeLab. Pay attention to the arrow on the front of the cuvette.
4 Start ZERO measurement.
5 Remove the cuvette again.
6 Unscrew the lid from the cuvette.
7 Add 1 DPD N°4 Photometer tablet(s) to the test water in the cuvette.
8 Crush the tablet with a clean stirring rod.
9 Stir with the stirring rod for about 20 seconds until the reagent is completely dissolved.
10 Screw the lid back on the cuvette.
11 Gently swirl the cuvette to mix the liquid well.
12 Insert the cuvette into the PrimeLab. Pay attention to the arrow on the front of the cuvette.
13 Tap TEST to start a 02:00 minute(s) countdown.
14 After the lapse of a 02:00 minute(s) countdown the measured value is displayed.
Notes:
The chemical to be identified with this test procedure is potassium monopersulfate(MPS).
Make sure no active oxygen escapes while preparing the sample. The measurement must be
performed directly after sampling.
Do not clean glassware and equipment with household detergents, as these could greatly
reduce the measurement result. To prevent any contamination, the cuvette, lid and stirrer
should be stored in a 0.1 % sodium hypochlorite solution for one hour. Then rinse with distilled
water, thoroughly.
If the sample water contains further oxidizing agents, these will react like acive oxygen and
contribute to the measurement result.
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