Method 1001

Methyl Chloride

This method is for the collection and analysis of methyl chloride (chloromethane) in workplace or indoor air.  The sample is collected on two charcoal tubes connected in series.  After collection,  both tubes are desorbed separately with 3mL of methylene chloride.  Both tubes are analyzed separately by GC/FID (flame ionization detector).

The working range of the method is 31 to 320 ppm (66 to 670 mg/m³) for a 1.5 L air sample. 

NOTE: This method combines and revises Methods S99 and P&CAM 201.

(NIOSH Issue 2: 15 August 1994)


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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   There is a 95% recovery of methyl chloride after 7 days from sampling to analysis if samples are kept refrigerated.
Preservatives:   Store samples refrigerated.
Required Preps:   2 Coconut shell charcoal tubes, 200 mg/400 mg and 50 mg/100 mg (SKC 226-01)
Collection Method:   The method recommends a flow rate of 0.01 - 0.1 L/min. and a 0.4 - 3L sample collection volume.
Analytical Methodology:   GC/FID
Documentation:   1001

Analyte List*

Analyte Formula CAS Number Detection Limit
Chloromethane (Methyl chloride)

* 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.