Water I.D. Primelab 2.0, Manual

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(66)
Hydrogen Peroxide LR
0.00 - 1.90 mg/l (H₂O₂)
Liquid
Internal Name: 66-Hydr-Per-LR-liq
10ml
30ml Hydrogen Peroxide LR N°1 (PL30HydLRP1)
30ml PL Hydrogen Peroxide LR N°2
(PL30HydLRP2)
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 Empty the cuvette to a few drops.
8 Add 3 drop(s) of PL Hydrogen Peroxide LR 1 into the cuvette.
9 Add 3 drop(s) of PL Hydrogen Peroxide LR 2 into the cuvette.
10 Fill the cuvette to 10 ml with the sample water.
11 Screw the lid back on the cuvette.
12 Gently swirl the cuvette to mix the liquid well.
13 Insert the cuvette into the PrimeLab. Pay attention to the arrow on the front of the cuvette.
14 Tap TEST to perform the measurement.
15 After the lapse of a 02:00 minute(s) countdown the measured value is displayed.
Notes:
If the sample water contains more than 10 mg/l hydrogen peroxide, a measured value of 0 mg/l
can be displayed. In that case, a dilution is recommended.
Make sure no hydrogen peroxide escapes while preparing the sample. The measurement must
be performed directly after sampling.
If the sample water contains further oxidizing agents, these will react like hydrogen peroxide
and contribute to the measurement result.
The DPD reagent buffers the pH value of the sample water in the range of 6.2 to 6.5, which is
essential for colour development. If the sample water is very alkaline or acidic, this must be
adjusted to a pH within the range of 6 to 7 by addition of 0.5 mol/l sulphuric acid or 1 mol/l
caustic soda, respectively, before the DPD reagent is added.
T88/204 T88/204