This method describes the sample collection and analysis of airborne chlorine dioxide. Samples are taken in the breathing zone of workplace personnel, and analysis is performed by ion chromatography (IC). An air sample is collected using a calibrated sampling pump and a midget fritted glass bubbler. The bubbler contains a collection solution of 0.02% potassium iodide (KI) in a sodium carbonate/sodium bicarbonate buffer. In the weakly basic solution, chlorine dioxide reacts with KI to form chlorite, which is then determined by an ion chromatograph equipped with a conductivity detector and gradient pump.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | None noted in method. |
| Preservatives: | None noted in method. |
| Required Preps: | Midget fritted glass bubbler (MFGB), containing 0.02% potassium iodide (KI) in a sodium carbonate/sodium bicarbonate buffer solution. |
| Collection Method: | Glass Bubbler: 120L (TWA) @ 0.5L/min; 7.5L (STEL) @ 0.5L/min. |
| Analytical Methodology: | Ion Chromatography with conductivity detector. |
| Documentation: | 
ID-202
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Chlorine dioxide | ClO2 |
10049-04-4 |
1.23 |
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.