This method describes the sample collection and analysis of methylene chloride. Samples are collected by drawing air through glass sampling tubes containing Carbosieve S-III (carbon based molecular sieve) adsorbent. Samples are desorbed with a mixture of 99:1 (v/v) carbon disulfide (CS2)/dimethyl-formamide (DMF) in the presence of anhydrous sodium sulfate and are analyzed by GC using a flame ionization detector.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | Recovery remained above 99% after 17 days of storage at ambient temperature (22°C) or refrigeration at -20°C. |
| Preservatives: | Keep frozen or at ambient temperature. |
| Required Preps: | Samples are collected with 7cm x 6mm OD x 4mm ID glass sampling tubes packed with two sections of 60/80 mesh Carbosieve S-III. The front section contains 130 mg and the back section contains 65 mg of adsorbent |
| Collection Method: | Solid sorbent sampling tubes; 3L @ 0.05L/min. |
| Analytical Methodology: | GC/FID |
| Documentation: | 
080
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Methylene chloride | CH2Cl2 |
75-09-2 |
2.09 |
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.