Chematest 35
Photometry
A-96.730.121 / 160920
13
4.2. How To Use Reagents
Whenever possible, Swan supplies reagents in liquid form, as used
in professional laboratories. We believe that the disadvantage of
shorter shelf life is more than compensated for by the ease of use
compared to tablets or powders.
The OXYCON-DPD reagent is delivered in two small bottles to in
-
crease shelf life. One contains DPD as powder (DPD 1a), the other
contains the solvent (DPD 1b). Before use, fill the contents of DPD
1b into DPD 1a, close the bottle with the drop counter and shake
firmly until the DPD powder has completely dissolved. Write the
mixing date on the bottle. The prepared reagent can be stored at
room temperature for 2 months.
The reagents OXYCON START and OXYCON 2 have a shelf life of
at least 6 months. They will last a year if handled carefully and
stored at 5 °C. With the blister pack, all reagents can be taken out
of the case at once and placed in the refrigerator.
To dispense the necessary number of drops, hold the bottle at a 45°
angle. Before proceeding with the measurement, make sure that
the reagents are well mixed with the sample.
The Chematest 35 is calibrated against Swan's OXYCON reagents.
Accuracy may suffer severely if reagents from other sources are
used.
