This method is for the determination of volatile organic (VO) concentration of a waste sample. A sample of waste is taken from representative location of the unexposed waste (where the waste has had minimum opportunity to volatilize to the atmosphere). The sample is suspended in an organic/aqueous matrix, heated and purged with nitrogen for 30 minutes. An aliquote of the sample is analyzed for carbon concentration, as methane, using GC/FID (gas chromatography/flame ionization detector). Another aliquot of the sample is analyzed for chlorine concentration, as chloride, using GC/ELCD (gas chromatography/electrolytic conductivity detector). The VO concentration is the sum of the carbon and chlorine content of the sample.
The sample is collected in polyethylene glycol (PEG) that has been cleaned and stored under a nitrogen purge until used for sampling. PEG reduces the loss of organics during the sampling procedure. 30mL of PEG is placed into a pre-weighed 40mL glass vial. The sampling tip is placed below the surface of the waste and connected to the sample vial via Teflon tubing. The vial is filled to the top to minimize headspace and put on ice.
At the laboratory, the vial is weighed again and then analyzed using GC/FID and GC/ELCD. An audit sample is required if the data are to be used for compliance purposes.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | None specified in method. |
| Preservatives: | Keep samples on ice after collection and during shipment. |
| Required Preps: | Cleaned PEG (polyethylene glycol) for sample collection. |
| Collection Method: | Sample purge per Method 25D. |
| Analytical Methodology: | GC/FID and GC/ELCD |
| Documentation: | 
25D
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
* 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.