Interferences - Hach Pocket Colorimeter II Instruction Manuals

Bromine, Total, LR,
If a chlorine standard is used, multiply its concentration by 2.25 to determine the
equivalent bromine concentration.

Interferences

Interfering
Substance
Acidity
Alkalinity
Chlorine, Cl
2
continued
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 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 may fade instantly. Neutralize to pH 6–7 with 1 N Sulfuric
Acid. Determine amount to be added on separate 10-mL sample,
then add the same amount to the sample being tested. Correct
for the additional volume.
Interferes at all levels
. May not develop full color or
3
. May not develop full color or
3
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