This method is for the determation of fluoride in drinking, surface and saline waters, domestic and industrial wastes using an ion selective electrode (ISE). Fluoride is determined potentiometrically using a fluoride electrode in conjunction with a standard single junction sleeve-type reference electrode and a pH meter having an, expanded millivolt scale or a selective ion meter having a direct concentration scale for fluoride.
The range of the method is 0.1 up to 1000 mg/L of fluoride. For total or total dissolved fluoride, the Bellack distillation is required for NPDES monitoring but is not required for SDWA monitoring.
Extreme pH interferes with the method. The pH of the sample should be between 5-9. Polyvalent cations of Si+4, Fe+3 and Al+3 interfere with the analysis by forming complexes with fluoride.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | 28 days from sample collection to analysis. |
| Preservatives: | None specified in the method. |
| Required Preps: | 500 mL HDPE or glass bottle |
| Collection Method: | Grab sampling |
| Analytical Methodology: | Potentiometric, Ion Selective Electrode |
| Documentation: | 
340.2
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Fluoride | F- |
16984-48-8 |
0.1 |
mg/L |
* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.