This method is used for the determination of fluorides. The sample is collected on cellulose ester membrane filters, eluted with sodium tetraborate, and analyzed by ion chromatography. The working ranges are 0.05 to 10 ppm HF (0.04 to 8mg/m³) and 1.2 to 8mg/m³ water-insoluble fluorides for a 250 L air sample. Water soluble particulate fluorides may be extracted by the procedure for gaseous fluoride(100 mL water). Insoluble particles require fusion (fusion in sodium hydroxide, dissolved and diluted 1:40 in water). The method applies to mining samples; aluminum reduction, ceramic, glass etching, electroplating, semi-conductor, and fluorochemical industries. The method is applicable to ceiling and STEL (short term exposure limit) monitoring. NOTE: M7902 (fluorides by ISE) employs the same sampling procedure, but uses ion selective electrodes for measurement. M7903 (Acids, Inorganic) is an alternate method for HF.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | Stable |
| Preservatives: | None noted in method |
| Required Preps: | Cellulose ester membrane filters (0.8µm pore size) with a sodium bicarbonate treated cellulose pad. |
| Collection Method: | Filter: 1L to 120L @ 1-2 L/min. |
| Analytical Methodology: | Ion Chromatography/Conductivity. |
| Documentation: | 
7906
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Hydrogen fluoride | HF |
7664-39-3 |
120 |
µg |
* 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.