You are here:
DEVELOPMENT AND VALIDATION OF A SOURCE TEST METHOD FOR 2,4-TOLUENE DIISOCYANATE
Citation:
Wilshire, F., J. Knoll, S. Foster, AND J. McGaughey. DEVELOPMENT AND VALIDATION OF A SOURCE TEST METHOD FOR 2,4-TOLUENE DIISOCYANATE. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-93/124 (NTIS PB93204055).
Description:
Four isocyanates are listed for regulation in the Clean Air Act Amendments of 1990: hexamethylene-1,6 diisocyanate, methylene diphenyl diisocyanate, and 2,4-toluene diisocyanate, each of which is used in the production of polymers, and methyl isocyanate which is an intermediate in the manufacture of the insecticide carbaryl (i.e., SevinR dust). To support projected regulations, a study is under way to produce a source sampling and analysis method for the four pollutants cited above. n the procedure under development, the isocyanates are collected in an absorbing solution and derivatized with I-(2-pyridyl)piperazine and analyzed by HPLC with UV detection. ystem was developed in the laboratory to generate isocyanate atmospheres for optimization of sampling parameters and chromatographic conditions. he accuracy and precision of the method is determined in the field using train spiking and multiprobe sampling following the procedures outlined in EPA Method 301. A field test of the isocyanate method, following EPA Method 301 procedures was performed at a flexible foam manufacturer in the Greensboro-High Point, NC area. esults were excellent, with analyte spike recoveries of 91% 6%. The method's limit of quantitation (LOQ) was determined to be 351 ng of TDI/M3.