This method describes the sample collection and analysis of airborne sulfur dioxide. This analytical method is normally not compound-specific. Compounds are only determined as the element. An air sample is collected (in the breathing zone of workplace personnel) using a calibrated sampling pump and a glass tube containing impregnated activated beaded carbon (IABC). A prefilter/cassette assembly can be used to collect particulates if necessary. The sampling medium is desorbed in 15 mM sodium hydroxide which contains 0.3 N (1%) hydrogen peroxide. An aliquot of this solution is analyzed as sulfate by ion chromatography.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | Samples can be stored at ambient (20 to 25 °C) temperature for a period of at least 30 days. |
| Preservatives: | None noted in method |
| Required Preps: | Two solid sorbent tubes: one packed with a 100-mg IABC front/50-mg back section. Type two: combination sampling device with two tubes: front contains teflon filter(25-mm x 12-mm OD x 10-mm ID), second contains two sections of IABC (5cm x 6mm OD x 4mm ID) |
| Collection Method: | A sampling tube containing impregnated activated beaded carbon at a recommended volume of 12L @ 0.1L/min for TWA, and 1.5L @ 0.1L/min for 15-min for STEL. |
| Analytical Methodology: | Ion Chromatography (IC) |
| Documentation: | 
ID-200
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Sulfur dioxide | SO2 |
7446-09-5 |
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* 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.