Interferences - Hach Pocket Colorimeter II Instruction Manuals

Chlorine, Free and Total, HR,

Interferences

Interfering
Substance
Acidity
Alkalinity
Bromine, Br
2
Hardness
Iodine, I
2
Interference Levels and Treatments
Greater than 150 mg/L CaCO
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.
Greater than 250 mg/L CaCO
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.
Interferes at all levels
No effect at less than 1,000 mg/L as CaCO
Interferes at all levels
continued
. May not develop full color or
3
. May not develop full color or
3
1—46
3