Hach DR/850, Procedures Manual, Page: 303 / 460

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ORGANIC CARBON, TOTAL, Mid Range,
continued
Method Performance
Precision
Estimated Detection Limit
Use Method Number 10173 to test TOC levels below 15 mg/L C.
Sensitivity
At mid-range, the sensitivity, expressed as the concentration change per 0.010 absorbance
change, is 1.9 mg/L C.
Interferences
The following have been tested for interference and found not to interfere up to the indicated
levels:
mg/L C 95% Confidence Limits
15 ± 5 mg/L C
50 ± 6 mg/L
75 ± 7 mg/L
115 ± 4 mg/L
150 ± 6 mg/L
Table 1 Non-interfering Substances
Substance Maximum Level Tested
Aluminum 10 mg/L
Ammonia Nitrogen 1000 mg/L as N
ASTM Wastewater No effect
Bromide 500 mg/L Br
Bromine 25 mg/L Br
2
Calcium 2000 mg/L as CaCO
3
Chloride 1500 mg/L
Chlorine 10 mg/L Cl
2
Chlorine Dioxide 6 mg/L ClO
2
Copper 10 mg/L
Cyanide 10 mg/L CN
Iodide 50 mg/L
Iron (II) 10 mg/L
Iron (III) 10 mg/L
Magnesium 2000 mg/L as CaCO
3
Manganese (VII) 1 mg/L