13
The instructions listed below should be carefully followed during testing to ensure best accuracy.
• For adding the exact amount of sample and deionized water
to the cuvette it is strongly recommended to use two class
A laboratory pipettes.
• Alternatively, fill the cuvette up to the 10 mL mark: the
liquid in the cuvette forms a concavity on the top; the
bottom of this concavity must be at the same level of the
10 mL mark.
• Proper use of dropper:
(a)
to get good reproducible results, tap the dropper on the table for several times and wipe
the outside of the dropper with a cloth.
(b)
always keep the dropper bottle in a vertical position while dosing the reagent.
• Color or suspended matter in large amounts may cause interference, therefore these should be
removed by treatment with active carbon and by prior filtration.
• It is important that the sample does not contain any debris. This would corrupt the reading.
• Each time the cuvette is used, the cap must be tightened to the same degree.
class A pipette
GENERAL TIPS FOR AN ACCURA
TE MEASUREMENT
(a)
(b)
• In order to avoid reagent leaking and to obtain more accurate
measurements, it is recommended to close the cuvette first
with the supplied HPDE plastic stopper and then with the black
cap.