This method describes the collection and analysis of airborne sulfur dioxide using midget-fritted glass bubblers (MFGBs) in the workplace. It is applicable for both short-term (STEL) and time weighted average (TWA) exposure evaluations. A calibrated personal sampling pump is used to draw a known volume of air through a midget-fritted glass bubbler containing 10 to 15 mL of 0.3 N hydrogen peroxide. Samples are directly analyzed with no sample preparation by ion chromatography as total sulfate.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | Collected liquid samples are stable for at least 30 days. Analyze samples the same day they are prepared for analysis. |
| Preservatives: | Special precautions are not necessary during storage. |
| Required Preps: | Midget fritted glass bubbler containing 0.3N Hydrogen Peroxide. |
| Collection Method: | Glass Bubbler: 15 to 60 L @ 1L/min. |
| Analytical Methodology: | Ion Chromatography. |
| Documentation: | 
ID-104
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Sulfur dioxide | SO2 |
7446-09-5 |
0.033 |
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.