Hach POCKET COLORIMETER II Instruction Manual page 45

Chloramine (Mono),
The following may interfere when present at concentrations greater than listed:
Interfering Substance and
Positive or Negative
Effect
Magnesium(+)
7+
Manganese (−)
Ozone(−)
Sulfide(+)
Thiocyanate(−)
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continued
Table 2 Substances that May Interfere
Interference Level
Above 400 mg/L CaCO
Above 3 mg/L
Above 1 mg/L
Turns rust colored if
present
Above 0.5 mg/L
1—44
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Recommended Treatment
Add 5 drops Rochelle Salt
3
solution before testing
—
NA
Usually doesn't co-exist
with monochloramine.
NA
Usually doesn't co-exist
with monochloramine.
—
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