This method is used for the determination of hydrogen sulfide. The sample is collected on a Zeflour filter followed by a charcoal tube. The tube is with 0.1M ammonium hydroxide and hydrogen peroxide and analyzed by, followed by analysis by ion chromatography. The pre-filter can be discarded unless analysis for particular sulfates by NIOSH 6004 is required.
The upper limit of loading on the tube depends on the concentrations of hydrogen sulfide and other substances in the air, including water vapor. High relative humidity (80%) increases the capacity of the sampler four-fold, relative to dry air.
The working range is 0.6 to 14 ppm (0.9 to 20 mg/m³) for a 20 L air sample.
NOTE: Alternate methods are S4 which uses impinger collection and P&CAM 296 which uses a molecular sieve sampler but has poor stability.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | The method states the tubes are stable for at least 30 days if kept at 25°C. |
| Preservatives: | Keep samples at 25°C. |
| Required Preps: | 0.5 micron Zefluor filter and a charcoal tube, 400mg/200mg (ORBO 34) |
| Collection Method: | The method recommends a 0.1 - 1.5 L/min. flow rate and a 1.2 - 40L sample volume. |
| Analytical Methodology: | Ion chromatography |
| Documentation: | 
6013
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Hydrogen sulfide | H2S |
7783-06-4 |
5 |
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.