44
METHOD PROCEDURE
• Add one packet of
HI93718-0
Iodine
Reagent. Replace the plastic stopper
and the cap. Shake gently for about 20
seconds to dissolve most of the reagent.
• Insert the cuvette into the holder and
ensure that the notch on the cap is
positioned securely in the groove.
• Press
Read
. The display will show a 2 minute and 30 second countdown prior to
the measurement. To skip the timer, press
Read
twice. When the timer ends, the
meter will perform the reading. The instrument displays the concentration in
mg/L
of
iodine (I
2
).
INTERFERENCES
Interference may be caused by:
• Bromine, Chlorine, Oxidized forms of Chromium and Manganese, Ozone
• Hardness greater than 500 mg/L CaCO
3
, to remove the interference shake the
sample for approximately 2 minutes after adding the reagent
• Alkalinity greater than 250 mg/L CaCO
3
or acidity greater than 150 mg/L CaCO
3
,
the color of the sample may develop only partially or rapidly fade, to remove the
interference neutralize the sample with diluted HCl or NaOH