159
OZONE
• To determine the mg/L ozone (O
3
) concentration in sample containing chlorine subtract value B
(additional measurement procedure) from value A (standard measurement procedure).
INTERFERENCES
Interference may be caused by: Bromine, Chlorine Dioxide, Iodine.
Alkalinity above 250 mg/L CaCO
3
will not reliably develop the full amount of color or it may rapidly
fade. To resolve this, neutralize the sample with diluted HCl.
In case of water with hardness greater than 500 mg/L CaCO
3,
shake the sample for approximately 2
minutes after adding the powder reagent.
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