EPA-NERL: 340.3: Fluoride by Colorimetry
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Official Method Name
|
Fluoride (Colorimetric, Automated Compexone) |
|---|---|
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Current Revision
| Issued 1971 |
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Media
|
WATER |
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Instrumentation
|
Automated Spectrophotometer |
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Method Subcategory
|
Inorganic |
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Method Source
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Citation
|
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Brief Method Summary
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Fluoride ion reacts with the red cerous chelate of alizarin complexone which is determined by automated colorimetry. |
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Scope and Application
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This automated method determines fluoride in drinking, surface and saline waters; domestic and industrial wastes. |
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Applicable Concentration Range
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0.05 - 1.5 mg/L |
|
Interferences
|
Aluminum interference (aluminum forms a complex with fluoride) can be eliminated by treating the sample with 8-hydroxyquinoline (to complex aluminum) and extraction with chloroform. At aluminum levels below 0.2 mg/L, the extraction procedure is not required. |
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Quality Control Requirements
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None. |
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Sample Handling
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No special requirements. |
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Maximum Holding Time
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28 days (MCAWW, Table 1). |
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Relative Cost
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Less than $50 |
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Sample Preparation Methods
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