Hach DR/850 Procedures Manual page 88

CHLORAMINE, MONO, Low Range, continued
Table 9 Non-interfering Substances (Continued)
Substance
Bromine
Calcium
Chloride
Chlorine Dioxide
Chromium (III)
Copper
Cyanide
Free chlorine
Glycine
Iron (II)
Iron (III)
Lead
Nitrate
Nitrite
Phosphate
Silica
Silver
Sulfate
Sulfite
Tyrosine
Urea
Zinc
Table 10 Interfering Substances
Interfering Substance
and its effect
Magnesium
Manganese (+7)
Ozone
Sulfide
Thiocyanate
88
Maximum Level Tested
15 mg/L Br
1000 mg/L CaCO
18,000 mg/L
5 mg/L ClO
5 mg/L
10 mg/L
10 mg/L CN
10 mg/L Cl
1 mg/L N
10 mg/L
10 mg/L
10 mg/L
100 mg/L as N
50 mg/L N
100 mg/L PO
100 mg/L SiO
10 mg/L
2600 mg/L
50 mg/L SO
1 mg/L N
10 mg/L N
5 mg/L
Interference Level
+ Above 400 mg/L
CaCO
3
– Above 3 mg/L
– Above 1 mg/L
+ Turns a "rust" color if
present.
– Above 0.5 mg/L
2
3
2
-
2
3–
4
2
2–
3
Recommended
Treatment
Add 5 drops Rochelle
Salt Solution prior to
testing.
Usually doesn't coex-
ist with monochlora-
mine.
Usually doesn't coex-
ist with monochlora-
mine.