This method is for the determination of paraquat from workplace air. The sample is collected on 1µm pore size PTFE filter membrane. After collection the sample is desorbed in 5mL deionized water and analyzed by HPLC with a UV detector. The working range of the method is 0.1 to 10 mg/m³ for a 200-L air sample. The paraquat dichloride or bismethyl sulfate salt can be quantitated by this method. The standards are prepared from a solution of the dichloride salt with appropriate stoichiometric factor applied. Note: This method revises Method S294.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | The method says that samples are stable for at least 1 week if kept at 25°C. |
| Preservatives: | Keep samples at 25°C. |
| Required Preps: | 37mm PTFE filter |
| Collection Method: | The method recommends a 1 - 4 L/min. flow rate and a 40L - 1000L sample collection volume. |
| Analytical Methodology: | HPLC/UV |
| Documentation: | 
5003
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Paraquat | C12H14Cl2N2 |
4685-14-7 |
10 |
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.