title: Determination of 4,4'-methylenebis(2-chloroaniline) in urine using capillary gas chromatography and negative ion chemical ionization mass spectrometry.
abstract: A highly sensitive and specific gas chromatographic-mass spectrometric (GC-MS) assay for the determination of 4,4'-methylenebis(2-chloroaniline) (MBOCA) in urine is reported. It is based on the solvent extraction of the hydrolysed MBOCA conjugates, together with deuterium-labelled benzidine-d8 added as an internal standard, and a two-phase derivatization procedure involving use of pentafluoropropionic anhydride in the presence of ammonia as the phase-transfer catalyst. The reaction is complete within 2 min at room temperature. The pentafluoropropyl derivatives are determined by use of capillary column GC-MS with selected-ion monitoring in the negative ion chemical ionization mode. The lower limit of detection for MBOCA was 1 microgram dm-3 and the calibration graph showed linearity between 10 and 250 micrograms dm-3. The recovery of the analyte added to pooled urine was above 86%. Thirty urine specimens from workers employed in a polyurethane-producing plant were analysed for MBOCA by this method.
authors.affiliation: Occupational Health Laboratory, Ontario Ministry of Labour, Weston, Canada.
authors.forename: K
authors.initials: K
authors.lastname: Jedrzejczak
authors.forename: V S
authors.initials: VS
authors.lastname: Gaind
mesh_terms: D000328:Adult; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D006801:Humans; D008753:Methylenebis(chloroaniline) / Q000032:analysis*; D014556:Urine / Q000737:chemistry
chemical_list: D008753:Methylenebis(chloroaniline)