采用傅里叶变换衰减全反射红外光谱法(ATR-FTIR)研究北京西北城区灰霾天气下PM2.5中有机官能团(R-OH羟基、R-CH脂肪族碳氢基、R-CO-羰基、R-NO2硝基官能团)和无机离子(NH4+、SO42-、NO3-)的变化规律.结果表明, PM2.5中无机离子(NH4+、SO42-、NO3-)的ATR-FTIR吸收峰值高于有机官能团(R-CH, R-CO-, R-NO2, R-OH)的峰值；有机官能团R-CH的吸收峰峰值高于R-CO-和R-NO2官能团的吸收峰, R-OH官能团的吸收峰峰值最低.灰霾天PM2.5中各有机官能团和无机离子的ATR-FTIR吸收峰值明显高于非灰霾天.说明灰霾天气下 PM2.5中这些官能团及无机离子的质量浓度均高于非灰霾天.灰霾天 PM2.5中无机离子(NH4+、SO42-、NO3-)质量浓度高于有机官能团(R-CH, R-CO-, R-NO2, R-OH)的质量浓度,且有机官能团以R-CH为主, R-CO-, R-NO2次之, R-OH最少.%An Attenuated Total Reflectance-Fourier Transform Infrared (ART-FTIR) spectroscopy was used to measure the functional groups (R-NO2, R-CO-, R-CH and R-OH) and inorganic ions (SO42-, NO3- and NH4+) in PM2.5 collected in the northwest of Beijing during haze days. The absorption peaks of inorganic ions (NH4+, SO42- and NO3-) were higher than those of functional groups (R-NO2, R-CO-, R-CH and R-OH), the absorption peak of R-CH was higher than those of R-NO2 and R-CO-, and the absorption peak of R-OH was lowest. The absorption peaks of these functional groups and inorganic ions of the PM2.5 in haze days were higher than those in the non-haze days, indicating that the mass concentrations of these functional groups and inorganic ions in haze days were higher than those in the non-haze days. During haze days, the mass concentrations of the inorganic ions (NH4+, SO42- and NO3-) were higher than those of functional groups (R-NO2, R-CO-, R-CH and R-OH), the mass concentration of R-CH was higher than those of R-NO2 and R-CO-, and the mass concentration of R-OH was lowest.
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