This method is for the collection and analysis of methyl ethyl ketone peroxide (MEKP) from workplace air. The sample is collected using midget impingers. The impingers are filled with 15mL of dimethyl phthalate. After collection, 5mL of diphenylcarbazide color reagent is added to an aliquot of the impinger solution and analyzed by visible absorption spectrophotometry (VAS).
The working range of the method is 0.11 to 1.1 ppm (0.75 to 7.5 mg/m3) for a 100L air sample.
The diphenylcarbazide color reaction is relatively non-specific. Most ketones, except for acetone, will exhibit positive intereference at high levels. Other peroxides or strong oxidants might also present positive interferences.
NOTE: This method revises Method P&CAM 331.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | The analyte recovery was above 90% after 21 days from sample collection when kept at -4°C. |
| Preservatives: | Keep samples at -4°C from sample collection to analysis. Ship samples to the lab on dry ice. |
| Required Preps: | Dimethyl phthalate impinger solution |
| Collection Method: | The method recommends a 0.5 - 2 L/min. flow rate with a 52 - 520L sample collection volume. |
| Analytical Methodology: | VAS |
| Documentation: | 
3508
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Methyl ethyl ketone peroxide | C4H10O4 |
1338-24-4 |
75 |
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.