This method is used for the determination of chlorine and bromine. The sample is collected on a PTFE prefilter, followed by a silver membrane. After extraction with sodium thiosulfate, the sample is analyzed by Ion chromatography. The working ranges for bromine and chlorine are 0.008 to 0.4 ppm (0.06 to 2.6 mg/m³) and 0.007 to 0.5 ppm (0.02 to 1.5 mg/m³) respectively, for 90 L air samples. The method has sufficient sensitivity for STEL (short term exposure limit) samples. NOTE: P&CAM 209 (colorimetric), OSHA methods ID-101 and ID-108 are alternative methods.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | > 30 days at 25 °C |
| Preservatives: | 25 °C |
| Required Preps: | Prefilter (PTFE, 0.5 µm) abd silver membrane filter (25-mm diameter, 0.45 µm pore size). |
| Collection Method: | Prefilter and filter: 8L to 360L @ 0.3 to 1 L/min for Bromine. 2L -90L @ 0.3 to 1L/min for chlorine. |
| Analytical Methodology: | Ion Chromatography, conductivity. |
| Documentation: | 
6011
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Bromine | Br2 |
7726-95-6 |
1.6 |
µg |
| Chlorine | Cl2 |
7782-50-5 |
0.6 |
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.