This method is for the determination of thiram. A sample is collected on 1-µm PTFE membrane filters; the filter is desorbed in 3mL acetonitrile and the cassette top in a 10mL acetonitrile rinse. The sample is then analyzed by HPLC with UV detection. The working range is 0.5 to 15 mg/m³ for a 200-L air sample. NIOSH researchers have used this method at facilities that use Thiram as an insecticide. Note: This is Method S256 in a revised format. An earlier spectrophotometric method, P&CAM 228, has not been revised because of excessive analytical variability.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | 7 days at 25°C. |
| Preservatives: | 25°C. |
| Required Preps: | 1-µm PTFE membrane filter (Millipore FA or equivalent), 37-mm diameter, two-piece polystyrene cassette filter holder with backup pad. |
| Collection Method: | 1-µm PTFE membrane filter; 10L to 400L @ 1-4L/min. |
| Analytical Methodology: | HPLC/UV |
| Documentation: | 
5005
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Thiram | C6H12N2S4 |
137-26-8 |
0.005 |
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.