Interferences - Hach POCKET COLORIMETER II Instruction Manual

Chlorine, Free and Total, LR,

Interferences

Interfering
Substance
Acidity
Alkalinity
Bromine, Br
2
Interference Levels and Treatments
Greater than 150 mg/L CaCO
color or color may fade instantly. Neutralize to pH 6–7
with 1 N Sodium Hydroxide. Determine amount to be
added on a separate 10-mL sample, then add the same
amount to the sample being tested. Correct for the
additional volume.
Greater than 250 mg/L CaCO
color or color may fade instantly. Neutralize to pH 6–7
with 1 N Sulfuric Acid. Determine amount to be added
on a separate 10-mL sample, then add the same
amount to the sample being tested. Correct for the
additional volume.
Interferes at all levels
1—34
continued
. May not develop full
3
. May not develop full
3