This method is for the collection and analysis of airborne hydrogen fluoride (HF) or particulate fluoride-containing (F) compounds in the workplace. The sample is collected on an MCE (mixed cellulose ester) filter and sodium carbonate treated backup pad using a personal sampling pump.
The MCE filter is fused with sodium hydroxide and the treated backup pad is desorbed with deionized water. Both samples are analyzed separately for total fluoride using an ion specific electrode (ISE) and the method of standard additions. The method can determine a wide concentration range of fluoride from approximately 25-2000 ug.
Note that the MCE filter should be prepped and analyzed even if the determination is only for HF. HF may react with some of the sampling media components causing an underestimation if the filter is not analyzed and reported for Total Fluoride.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | Use the treated backup pad within 2 months of preparation. Ship samples to the lab as soon as possible after collection per the method. |
| Preservatives: | None specified in method. |
| Required Preps: | 37mm, 0.8um MCE filter and sodium carbonate treated backup pad (SKC 225-9001) |
| Collection Method: | The method recommends a 1.5 L/min. flow rate with a collection volume of 22.5 - 90L. |
| Analytical Methodology: | ISE |
| Documentation: | 
ID-110
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Total Fluoride (particulate F and HF) | 25 |
ug | ||
* 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.