| Quantative analysis of chemical composition of atmospheric aerosol at high time resolution has been the focus for investigating chemical variation of atmosphere.It is reported our home-made highly time-resolved trace amount aerosol sampler, which can be applied to collect aerosols in different size ranges with time interval from1to6hours. Desorption ionization electrospray ionization mass spectrometry (DESI-MS) were employed to analysis the chemical compositions of these sample. Taking oxalic acid analysis for example, we collected size selected aerosol at hourly resolved sampling rate by our home-made sampler for several days. After the optimization for experimental conditions of DESI-MS, methanol with1%ammonia was used as the spray solution. The oxalic acid of these samples was quantatively analyzed without pretreatment or separation. Diurnal variations for oxalic acid in the PM2.5at hourly time resolution were obtained. It showed that our home-made sampler combined with DESI-MS can be used for rapid analysis of aerosol chemical composition and the diurnal changes for some specific compositions of aerosol. |
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