1—46
Chlorine, Free and Total, HR, continued
Interferences
Interfering
Substance
Interference Levels and Treatments
Acidity Greater than 150 mg/L CaCO
3
. May not develop full color or
color may fade instantly. Neutralize to pH 6–7 with 1 N
Sodium Hydroxide. Determine amount to be added on separate
5-mL sample, then add the same amount to the sample being
tested. Correct for the additional volume.
Alkalinity Greater than 250 mg/L CaCO
3
. May not develop full color or
color may fade instantly. Neutralize to pH 6–7 with 1 N
Sulfuric Acid. Determine amount to be added on separate 5-mL
sample, then add the same amount to the sample being tested.
Correct for the additional volume.
Bromine, Br
2
Interferes at all levels
Hardness No effect at less than 1,000 mg/L as CaCO
3
Iodine, I
2
Interferes at all levels
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