38
38
Continued...
Tablet
Note(s)
-> Sample water with a high calcium content or high conductivity will cloud the
sample and deteriorate the measurement precision. In this case use the
DPD N° 1 High Calcium (HC) and DPD N° 3 High Calcium (HC) tablets.
-> If the measuring water contains further reducing chemicals (e.g. active
oxygen, bromine etc.) this will also be detected and is part of the result.
-> 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 thoroughly rinse with distilled water.
-> The DPD reagent used in this procedure buffers the pH value of the sample
water in the range between 6.2 and 6.5 pH. If your sample water is very
alkaline or acidic this must be adjusted to a pH range between 6 and 7 by
the addition of 0.5 mol/l sulphuric acid or resp. 1 mol/l caustic soda before
the DPD reagent is added.
-> 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 chlorine
values please select the respective matching procedure.
0.00 - 8.00 mg/l
(Cl )
2
(11)
Chlorine
(free/combined/total)
Name on device: 11-Chlorine-tab
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