This method is applicable for the determination of fluoride (F-) emissions from stationary sources. Once collected, total fluoride is determined by analyzing the sample for F- using an ion specific electrode (ISE). This method does not measure fluorocarbons such as Freons.
Gaseous and particulate F- are sampled isokinetically using a modified Method 5 trains which consists of a filter and a series of impingers. The sampling procedures found in Method 13A are cited as the ones to use for this method. The probe may be heated to no greater than 120 +/- 14oC (248 +/- 25oF). The first and 2nd impingers are filled with 100mL of deionized water. The 3rd impinger is left empty and the 4th impinger is filled with 200-300g of silica gel. The filter specified for use is a Whatman No. 1 filter or equivalent. The method states that 3 filters from each lot used should be checked for F- prior to use for sampling. The filters must contain < 0.015 mg F-/cm2 in order to be acceptable for use.
After collection, the contents of the impingers are measured and transferred to a polyethylene bottle. The filter is added to the same container. Per the method, the filter can be treated separately given EPA approval. The probe, liner, filter holder, impingers, and connecting glassware are rinsed with deionized water and added to the same container. The method specifies using in total <500mL of deionized water for the train rinse. The silica gel can be weighed in the field to determine the moisture content of the stack gas.
This method requires that samples be prepared using distillation. As a cost saving measure, many laboratories do not perform the distillation step, however, the method does require this distillation step. The samples are then analyzed using a ISE for fluoride.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | None specified in method. |
| Preservatives: | None specified in method. |
| Required Preps: | Filter - Whatman No. 541 or equivalent |
| Collection Method: | Modified Method 5 train following Method 13A procedures. |
| Analytical Methodology: | ISE (Ion specific electrode) for fluoride |
| Documentation: | 
13B
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Total Fluorides | 0.02 |
µg/ml | ||
* 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.