This method is for the determination of methylene bisphenyl isocyanate (MDI). The sample is collected on a open-face glass fiber filter coated with 1.0 mg of 1-(2-pyridyl) piperazine (1-2PP). After collection the sample is extracted with 90/10 (v/v) acetonitrile/dimethyl sulfoxide (ACN/DMSO) and analyzed by high performance liquid chromatography (HPLC) using an ultraviolet (UV) or fluorescence detector.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | The method states recoveries of the analyte remained above 94.5% after 15 days of storage at -20°C and 22°C. |
| Preservatives: | None specified by the method. Store the coated glass fiber filter in a refrigerator prior to sampling. |
| Required Preps: | A three-piece styrene cassette containing a 1-2PP coated glass fiber filter (SKC 225-9002) |
| Collection Method: | The method recommends a flow rate of 1L/min. and a collection volume of 15L. |
| Analytical Methodology: | HPLC/UV or fluorescence detector |
| Documentation: | 
047
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Methylene diphenyl isocyanate (MDI) | C15H10N2O2 |
101-68-8 |
0.8 |
µg/m3 |
* 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.