PrimeLab 1.0 Multitest Manual De Usuario página 58

Bromine
(08)
Continued...
Note(s)
-> If the water sample contains chlorine and bromine both will be detected by
the DPD reagent and shown in the test result. If this is not required, the
measurement procedure must be amended as follows: After step 3 add a
"DPD Glycine" tablet to the sample liquid. Empty the cuvette except for a few
drops into a second clean vial.
Add a DPD N° 1 Photometer tablet to the first cuvette, which contains just a
few drops and crush it with a clean stirrer. Now fill the sample water with the
dissolved glycine tablet from the second cuvette into the first cuvette
containing the crushed DPD N° 1 Photometer tablet. Mix the tablet with the
liquid until it has dissolved completely. Wait for 2 minutes and then continue
with step 6.
-> When preparing the measurement it is important to avoid any bromine
escaping, which can happen during pipetting and shaking the sample.
The measurement must be performed directly after sampling.
-> It is important that the measurement devices to be used have not been
cleaned with household detergent, as this could greatly reduce the
measurement. To prevent any contamination the cuvette, the cuvette lid and
the stirrer should be stored in a 0.1 g/l sodium hypochlorite solution for one
hour and then rinse thoroughly with distilled water.
-> The DPD reagent used in this procedure buffers the pH value of the sample
water in a range of 6.2 to 6.5 pH. If your sample water is very alkaline or
acidic it must be adjusted to a pH range between 6 and 7 by adding 0.5 mol/l
sulphuric acid or respectively 1 mol/l caustic soda.
-> Water samples with parameter levels ´higher´ than the defined range may
lead to errors with the DPD chemistry; resulting in an incorrect reading
(possibly showing none detected). For measurement of higher bromine
values please dilute the water sample prior to testing.
-> If the water sample contains other reducing chemicals (e.g. active oxygen,
chlorine etc.) this will also be detected and be included in the result.
-> Water samples with a high calcium content resp. a high conductivity will
render the sample cloudy, which is detrimental to the measurement
precision. In this case use the "DPD N° 1 High Calcium (HC)".
25
0 - 18 mg/l
Name on device: 08-Bromine-tab
(Br )
2
Tablet
25