Water I.D. Primelab 2.0, Manual

Page: 74 / 301

(128)
Bromine
0.00 - 4.50 mg/l (Br₂)
Powder Pack
Internal Name: 128-Bromine-pp
10ml
DPD N°1 Photometer (PPPD1)
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°1 Photometer powder pillow to the sample water in the cuvette.
8 Stir with the stirring rod for about 20 seconds until the reagent is completely dissolved.
9 Screw the lid back on the cuvette.
10 Gently swirl the cuvette to mix the liquid well.
11 Insert the cuvette into the PrimeLab. Pay attention to the arrow on the front of the cuvette.
12 Tap TEST to start a 03:00 minute(s) countdown.
13 After the lapse of a 03:00 minute(s) countdown the measured value is displayed.
Notes:
Turbidity caused by high concentration of calcium ions will affect the measurement result. To
prevent that, please use DPD HC (High Calcium) reagents.
Make sure no bromine escapes while preparing the sample. The measurement must be
performed directly after sampling.
If the sample water contains more than 40 mg/l bromine, a measured value of 0 mg/l can be
displayed. In that case, a dilution is recommended.
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.
If the sample water contains further oxidizing agents, these will react like bromine and
contribute to the measurement result.
T19/204 T19/204