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The instructions listed below should be carefully followed during testing
to ensure best accuracy.
• Color or suspended matter in large amounts may cause interference,
therefore, these should be removed by treatment with active
carbon and by prior filtration.
• For a correct filling of the cuvet: the liquid
in the cuvet forms a convexity on the top;
the bottom of this convexity must be at
the same level of the 10 mL mark.
• Proper use of the dropper:
(a) to get good reproducible results, tap the dropper on the table
for several times and wipe the outside of the dropper tip with
a cloth.
(b) always keep the dropper bottle in a vertical position while
dosing the reagent.
• Proper use of the powder reagent packet:
(a) use scissors to open the powder packet;
(b) push the edges of the packet to form a spout;
(c) pour out the content of the packet.
• It is important that the sample does not contain any debris. This
would corrupt the reading.
10 mL
TIPS FOR AN ACCURATE MEASUREMENT
(a) (b)
(c)(a) (b)
