311
ORGANIC CARBON, TOTAL, High Range, continued
Method Performance
Precision
In a single laboratory, using a standard solution of 360 mg/L C
and one lot of reagents, a single operator obtained a standard
deviation of ±8 mg/L C.
Estimated Detection Limit
Use Method Number 10129 to test TOC levels below 20 mg/L C.
Sensitivity
At mid-range, the sensitivity, expressed as the concentration
change per 0.010 absorbance change, is 6 mg/L C.
Interferences
The following have been tested for interference and found not to
interfere up to the indicated levels:
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 5000 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
Monochloramine 14 mg/L NH
2
Cl as Cl
2
Nitrite 500 mg/L NO
2
-
Ozone 2 mg/L O
3
Phosphate 3390 mg/L PO
4
3-
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