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ORGANIC CARBON, TOTAL, Low Range,
Method Performance
Interferences
Precision
In a single laboratory, using a standard solution of 9.0 mg/L C
and one lot of reagents, a single operator obtained a standard
deviation of ±0.5 mg/L C.
Estimated Detection Limit
The estimated detection limit for Method 10129 is 0.3 mg/L C.
Sensitivity
At mid-range, the sensitivity, expressed as the concentration
change per 0.010 absorbance change, is 0.2 mg/L C.
The following have been tested for interference and found not to
interfere up to the indicated levels:
Table 1 Non-interfering Substances
Substance
Aluminum
Ammonia Nitrogen
ASTM Wastewater
Bromide
Bromine
Calcium
Chloride
Chlorine
Chlorine Dioxide
Copper
Cyanide
Iodide
Iron (II)
Iron (III)
Magnesium
Manganese (VII)
Monochloramine
Nitrite
Ozone
Phosphate
295
continued
Maximum Level Tested
10 mg/L
1000 mg/L as N
No effect
-
500 mg/L Br
25 mg/L Br
2
2000 mg/L as CaCO
3
500 mg/L
10 mg/L Cl
2
6 mg/L ClO
2
10 mg/L
-
10 mg/L CN
50 mg/L
10 mg/L
10 mg/L
2000 mg/L as CaCO
3
1 mg/L
14 mg/L NH
Cl as Cl
2
2
-
500 mg/L NO
2
2 mg/L O
3
2-
3390 mg/L PO
4
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