1—34
Chlorine, Free and Total, LR, 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 a separate 10-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 a separate 10-mL sample, then add the same
amount to the sample being tested. Correct for the
additional volume.
Bromine, Br
2
Interferes at all levels
5957088.book Page 34 Friday, March 22, 2013 3:54 PM
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