Method CTM-036

Method for Measurement of Isocyanate Compounds in Stack Emissions


This method is for the collection and analysis of the following isocyanates: toluene diisocyanate (TDI), methylenediphenyl diisocyanate (MDI), hexamethylene diisocyanate (HDI), HDI Biuret, HDI Trimer, and isophorone diisocyanate (IPDI) from stack emissions. 

Samples are collected isokinetically from emission sources on a 90mm glass fiber filter coated with 1-(2-pyridyl)piperazine (1,2-PP).  The basic train setup includes a probe, filter, and a sampling pump.  The sample is analyzed using HPLC.

After sample collection the filter is placed in a jar containing 5.0mL of 90:10 (v/v) [TDI or MDI] or 70:30 (v/v) [HDI/IPDI]
acetonitrile/DMSO.  The probe is rinsed with acetone, add 2-4 drops of 1-(2-pyridyl)piperazine or an unused coated filter to the bottle with the probe rinse.  The inside of the front glass filter housing is wiped with a 1,2-PP treated filter moistened with acetone or 90:10 (v/v) [TDI or MDI] or 70:30 (v/v) [HDI/IPDI] acetonitrile/DMSO.  This filter is placed in a vial with 5.0mL of 90:10 (v/v) [TDI or MDI] or 70:30 (v/v) [HDI/IPDI] acetonitrile/DMSO.  All containers are sent to the lab for analysis by HPLC. 


(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:   1,2-PP treated glass fiber filter
Collection Method:   Filter and sampling pump
Analytical Methodology:   HPLC
Documentation:   CTM-036

Analyte List*

Analyte Formula CAS Number Detection Limit
Methylene diphenyl isocyanate (MDI)
C15H10N2O2
101-68-8
1
 µg
1,6-Hexamethylene diisocyanate polycyclotrimer
(C8H12N2O2)n
28182-81-2
1
 µg
Isophorone diisocyanate (IPDI)
C12H18N2O2
4098-71-9
1
 µg
2,4-Toluene diisocyanate (TDI)
C9H6N2O2
584-84-9
1
 µg
1,6-Hexamethylene diisocyanate (HDI)
C8H12N2O2
822-06-0
1
 µg
Toluene-2,6-Diisocyanate
C9H6N2O2
91-08-7
1
 µg
2,4’-Methylenediphenyl diisocyanate
C15H10N2O2
5873-54-1
1
 µg
Hexamethylene Diisocyanate Biuret
4035-89-6
1
 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.