This method is for the determination of sulfur dioxide. Sulfur dioxide is collected on a cellulose filter followed by a sodium carbonate (Na2CO3) treated cellulose ester filter. The sulfur dioxide is collected on the back (treated) filter as sulfite. Sulfuric acid, sulfate salts, and sulfite salts are collected on the front filter and may be quantitated as total particulate sulfate. The front filter is only analyzed if determination of sulfuric acid or total particulate sulfate is required.
The working range of the method is 0.2 to 8ppm (0.5 to 20 mg/m³) for a 100 L air sample.
NOTE: This revises P&CAM 268. P&CAM 146, P&CAM 163, and S308 use hydrogen peroxide for sampling, followed by titration with sodium hydroxide or barium perchlorate. P&CAM 160 uses tetrachloromercurate solution and visible spectrometry. P&CAM 204 uses a solid sorbent (molecular sieve 5A), thermal desorption, and mass spectrometry.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | None specified in the method. |
| Preservatives: | None specified in the method. |
| Required Preps: | Mixed cellulose ester (MCE) filter and sodium carbonate treated filter (SKC 225-9005) |
| Collection Method: | The method recommends a flow rate of 0.5 to 1.5 L/min. and a sample collection volume of 4L to 200 L. |
| Analytical Methodology: | IC |
| Documentation: | 
6004
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Sulfur dioxide | SO2 |
7446-09-5 |
3 |
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.