Method CTM-031

Screening Method for Methylene Diphenyl Diisocyanate (MDI)

This method is a screening method for the collection and analysis of methylene diphenyl diisocyanate (MDI) from  manufacturing process emissions.  Method 207 or other approved method must be used for compliance projects.

The sample is collected at a sub-isokinetic rate on a 13mm glass fiber filter coated with 1 mg of 1-(20methoxyphenyl)piperazine (1,2-MP) or 1-(2-pyridyl)piperazine (1,2-PP).  The sampling train consists of a glass nozzle with a 90 degree bend, filter cassette and a personal sampling pump.  After collection, the filter is placed into a amber glass VOA vial.  The nozzle is rinsed with 2mL of acetonitrile/DMSO and the rinse is added to the VOA vial.  The sample is shipped to the lab for analysis by HPLC/UV following OSHA 47.

(EPA-Conditional Test Method)


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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   None specified in the method.
Preservatives:   None specified in the method.
Required Preps:   40mL Amber glass VOA bottle with Teflon-lined lid
Collection Method:   Treated filter following CTM-031 procedures
Analytical Methodology:   HPLC/UV
Documentation:   CTM-031

Analyte List*

Analyte Formula CAS Number Detection Limit
Methylene diphenyl isocyanate (MDI)

* 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.