Hanna Instruments HI 83213-2008 - Manual (Page 42)

42 Iodine
• Reinsert the cuvette into the instrument.
• Press Timer and the display will show the countdown prior to the measurement or, alternatively, wait
for 2 minutes and 30 seconds and press Read. When the timer ends the meter will perform the
reading.
• The instrument displays concentration in mg/L of iodine.
INTERFERENCES
Interference may be caused by: Bromine, Chlorine, Ozone, Oxidized forms of Chromium and Manganese.
In case of water with hardness greater than 500 mg/L CaCO
3
, shake the sample for approximately
2 minutes after adding the reagent.
In case of water with 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 may rapidly fade. To resolve this, neutralize the
sample with diluted HCl or NaOH.