This method is for the collection and analysis of 1,6-hexamethylene diisocyanate (HDI), 2,6-toluene diisocyante (2,6-TDI), and 2,4-toluene diisocyanate (2,4-TDI). The sample is collected on 1-(2-pyridyl)piperazine (1-2PP) coated glass fiber filters. After collection, the samples are extracted with 90/10 (v/v) acetonitrile/dimethyl sulfoxide (ACN/DMSO) and analyzed by high performance liquid chromatography using an ultraviolet or fluorescence detector (HPLC/UV).
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | All analyte recoveries were greater than 80% after 18 days of storage refrigerated (-25°C) or ambient (22°C) temperatures. |
| Preservatives: | Store filters are reduced temperatures until sampling. |
| Required Preps: | 3 piece cassette containing 1-2PP coated glass fiber filters (SKC 225-9002) |
| Collection Method: | The method recommends a 1 L/min. flow rate with a 15L sample collection volume. |
| Analytical Methodology: | HPLC/UV |
| Documentation: | 
42
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| 2,4-Toluene diisocyanate (TDI) | C9H6N2O2 |
584-84-9 |
1.3 |
µg |
| 1,6-Hexamethylene diisocyanate (HDI) | C8H12N2O2 |
822-06-0 |
2.3 |
µg |
| Toluene-2,6-Diisocyanate | C9H6N2O2 |
91-08-7 |
1.6 |
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.