This method is for the determination of trichlorotrifluoroethane (Freon) -soluble mineral oil mists, but not to semi-synthetic or synthetic cutting fluids. The sample is collected on a PVC filter, solubilized with trichlorofluoromethane and analyzed using infrared spectrophotometry (IR). It is recommended to submit a sample of the bulk liquid used to obtain the best sample results, however, the bulk liquid must be soluble in Freon.
Since the production of Freons are being phased out due to US-EPA regulations, NIOSH 5524 for metal working fluids is an alternate method.
The working range of the method is 1 to 20 mg/m³ for a 100-L air sample. Any aerosol which absorbs infrared radiation near 2950 cm-1 interferes with the measurement.
NOTE: This method revises P&CAM 283. P&CAM 159 and S272 use similar samplers with measurement by fluorescence spectrophotometry.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | None specified in the method. |
| Preservatives: | None specified in the method. |
| Required Preps: | 37 mm, 0.8 or 5 um PVC or MCE filter |
| Collection Method: | The method recommends a 1-3 L/min. flow rate with a collection volume of 20-500 L. |
| Analytical Methodology: | IR |
| Documentation: | 
5026
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Oil mist (mineral) | 8012-95-1 |
0.05 |
mg | |
* 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.