研究了气溶胶粒子的基质辅助激光解吸附电离质谱,在基质对分析物的摩尔比较高时,同时出现了基质和分析物离子峰;在基质对分析物的摩尔比低于5∶1时,出现了基质抑制效应。基质抑制效应可以产生高质量的质谱,即:质谱中分析物信号较强,基质信号很弱或者消失。因此,利用基质抑制效应,可以检测低分子量的分析物。 The matrix-assisted laser desorption ionization mass spectrometry of aerosol particles has been studied. When the molar ratio of matrix to analyte is high, both the matrix and the analyte ion peaks appear simultaneously. When the molar ratio of matrix to analyte is below 5: 1, The matrix inhibitory effect appears. The matrix suppression effect produces high quality mass spectra, ie strong analyte signals in the mass spectrum and weak or no matrix signals. Therefore, using matrix inhibition effects, low molecular weight analytes can be detected.