PrimeLab 1.0 Multitest Manual De Usuario página 61

Bromine
(63)
Continued...
Note(s)
-> DPD 1 A and DPD 1 B reagent MUST be added to the vial
BEFORE water sample is added to avoid mis-readings!
-> If the water sample contains chlorine as well as bromine, this will be
detected by the DPD reagent and displayed in the result. If you do not want
chlorine to be detected together with brome the measurement procedure
´ must be amended as follows: (Replace steps 3, 4 & 5 in Bromine procedure
on Page 17 with these steps below):
3) Remove the cuvette from the chamber and unscrew the lid. Add 3 drops
"PL DPD Glycine" into the 10 ml sample water and swirl to mix.
4) Add 3 drops "PL DPD 1A" and 3 drops "PL DPD 1 B" into a second
empty cuvette.
5) Pour the 10 ml of Glycine treated sample water from step 3 into the
second cuvette in step 4 and continue with Bromine procedure from step 6
onwards.
-> When preparing the measurement procedure it is important to avoid any
chlorine escaping, which can happen during pipetting and shaking the
sample. The measurement should 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)".
28
0 - 18 mg/l
Name on device: 63-Bromine-liq
(Br )
2
Liquid
+powder
28