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Interferences
Interfering Substance
Borate (as Na
B
O
)
2
4
7
Cobalt
Copper
Ferrous Iron
Hardness (as CaCO
)
3
Light
Lignosulfonates
Manganese
Molybdenum
Nickel
Phosphate
Phosphonates
Sulfate
Temperature
Zinc
Sample Collection, Preservation, and Storage
Method Performance
OxygenSca_PP_Other_IRD_Eng_Ody.fm
Greater than 500 mg/L
Greater than 0.025 mg/L
Greater than 8.0 mg/L
All levels
Greater than 1000 mg/L
Light may interfere. Keep sample cells in the dark during color development.
Greater than 0.05 mg/L
Greater than 0.8 mg/L
Greater than 80 mg/L
Greater than 0.8 mg/L
Greater than 10 mg/L
Greater than 10 mg/L
Greater than 1000 mg/L
Sample temperatures below 22 °C or above 28 °C (72 °F or 82 °F) may affect test accuracy.
Greater than 50 mg/L
Substances which reduce ferric iron will interfere. Substances which complex
iron strongly may also interfere.
Collect samples in clean, dry, plastic or glass containers. Avoid excessive
agitation or exposure to sunlight when sampling. Rinse the container several
times with the sample. Allow the container to overflow and cap the container so
that there is no headspace above the sample. Rinse the sample cell several times
with sample, then carefully fill to the 25-mL mark. Perform the analysis
immediately.
Precision
Program
Standard Level
180
181
182
183
184
See Section 3.4.3 Precision on page 44 for more information, or if the standard
concentration did not fall within the specified range.
Interference Levels and Treatments
95% Confidence Limits of Distribution
375 µg/L
280 µg/L
750 µg/L
1100 µg/L
750 µg/L
Oxygen Scavengers
370–380 µg/L
276–284 µg/L
740–760 µg/L
1085–1115 µg/L
735–765 µg/L
Oxygen Scavengers
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