Method 57

4,4'-Methylenedianiline (MDA)

This method is for the determination of 4,4'-methylenedianiline (MDA). The sample is collected on two sulfuric acid-treated glass fiber filters. After collection the filters are added to separate glass vials containing 2 mL of deionized water in order to enhance the stability of the collected samples. The addition of the water should occur within 10 hours of sample collection. The samples are extracted with 1.0 mL of 0.5 N NaOH and 2.0 mL of toluene. The sample is analyzed by GC/ECD (electron capture detector).



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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   Recovery remained above 79% after 15 days of storage at ambient temperature (20-25°C) or refrigeration at 2°C.
Preservatives:   Keep refrigerated or at ambient temperature.
Required Preps:   Two 37mm sulfuric-acid treated glass fiber filters (SKC 225-9004)
Collection Method:   The method recommends a 1 L/min. flow rate and a 100L sample collection volume.
Analytical Methodology:   GC/ECD
Documentation:   57

Analyte List*

Analyte Formula CAS Number Detection Limit

* 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.