Rapid Detection of Toluene-2,4-diisocyanate in Various Sports Fields Using Extractive Electrospray Ionization Mass Spectrometry
Plastic materials are widely used for sports venues,which release free toluene-2,4-diisocyanate(TDI),resulting in severe air pollution.The content of the free TDI monomer in the isocyanate-polymer is rigorously regulated by WHO to be lower than 0.5%.In this study,ambient air samples containing trace amounts of TDI-water aerosols were sucked with glass syringes on the spot and then directly injected into the home-made extractive electrospray ionization(EESI) source,which was installed on an LTQ-MS instrument for direct analysis of samples with complex matrices.The experimental condtionsconditions were:electrospray voltage,3 kV;capillary voltage,21 V;capillary temperature,175 ℃.The raw samples were directly analyzed by tandem EESI-MS without any sample pre-treatment and a single sample analysis was completed within 1 s.The limit of detection was found to be less than 0.04%(n=5,SN=100),which is much lower than that allowed in air.Based to the experimental results,the effects of several environmental factors such as temperature,illumination of sun,air ventilation and altitude on the TDI contents are discussed.