18
MEASUREMENT PROCEDURE
INTERFERENCES
Interference may be caused by:
Bromine
Iodine
Chlorine Dioxide
Ozone
Oxidized Manganese and Chromium
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 could disappear or develop only partially. To resolve this, neutralize the
sample with diluted HCl or NaOH.
In case of water with hardness greater than 500 mg/L CaCO
3
, shake the sample for approximately
2 minutes after adding the reagent.
• The instrument directly displays concentration in mg/L of free chlorine on the Liquid Crystal
Display.
• Fill the cuvette up to the 10 mL mark with unreacted sample and replace the cap.
• Place the cuvette into the holder and ensure that the notch on the cap is positioned securely
into the groove.
TOTAL CHLORINE MEASUREMENT