Method 15

Hydrogen sulfide (H2S), carbonyl sulfide (COS) and carbon disulfide (CS2)emissions from stationary sources

This method is used for the determination of emissions of reduced sulfur compounds from tail gas control units of sulfur recovery plants, hydrogen sulfide in fuel gas for fuel gas combustion devices and where specified in other regulations.  Samples are analyzed using a GC/FPD (flame photometric detector).

Sulfur reacts with metal and can bias results, therefore, all components of the sampling train need to be Teflon or Teflon lined.  Components of the sampling train include a probe, filter, and three SO2 scrubbers (impingers) in series.  The first two impingers are filled with a citrate buffer and the third left empty the solutions should be replaced after each run.  These scrubbers are important as they remove SO2 from the gas.  Large amounts of SO can interfere with the analysis as SO2 elutes near the target compounds making a chromatographic separation difficult.

The method calls for concurrent collection and analysis meaning the sample gas is passed through the scrubbers and directed onto the GC/FPD for analysis.  However for non-compliance work, it is not uncommon for samples to be collected in a canister or Tedlar bag and submitted to a laboratory for analysis.  It is recommended that samples collected in a canister or Tedlar bag be analyzed as soon as possible.

(EPA 40CFR Part 60 Appendix A)


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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   None specified in method.
Preservatives:   None specified in method.
Required Preps:   Teflon filter
Collection Method:   Sampling train following Method 15 procedures.
Analytical Methodology:   GC/FPH (flame photometric detector)
Documentation:   15

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Analyte List*

Analyte Formula CAS Number Detection Limit
Carbonyl sulfide
Carbon disulfide
Hydrogen sulfide

* 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.