Determination of 3,3′-dichloro-4,4′-diaminodiphenylmethane in air

✍ Scribed by Stanley K. Yasuda

• Book ID: 104143915
• Publisher: Elsevier Science
• Year: 1975
• Tongue: English
• Weight: 603 KB
• Volume: 104
• Category: Article
• ISSN: 1873-3778
• DOI: 10.1016/s0021-9673(00)91850-8

✦ Synopsis

A simple gas chromatographic method is described for the analysis of 3,3'dichloro-4,4'-diaminodiphenylmethane (MOCA) in air. MOCA is quantitatively collected on a Gas-Chrom S tube and the solid sorbent is extracted with acetone. An aliquot sample of the extract is introduced directly into the gas chromatograph, using a microsyringe and the sample is chromatographed on a I-ft., silylated 10% Dexsil column. The peak area of MOCA is measured and related to the concentration via a calibration curve prepared with a constant volume of standards, The chloroanilines associated with MOCA cause no interference; however, interference can be expected from any compounds having a retention time identical to that of MOCA. As little as 0.002 pg of MOCA per ,uI of acetone can be detected by this method.