真空型FTIR对有机无机混合气溶胶的研究

Understanding the Hygroscopic Properties of Inorganic Internally Mixed with Organic Aerosols Using Vacuum FTIR Coupling with Pulsed Relatively Humidity

真空傅里叶变换红外光谱仪结合压力方波装置,可以同时获取样品池内相对湿度和混合气溶胶样品的高时间分辨的红外光谱图。通过观测相对湿度快速变化过程中硫酸铵和戊二酸混合气溶胶的红外光谱,分析了吸湿性变化过程。结果表明,戊二酸使硫酸铵的潮解点降低,当硫酸铵/戊二酸摩尔比为1∶1时,潮解点最低为71.7%RH;并且戊二酸使硫酸铵的风化点滞后。

A rapid scan vacuum FTIR spectrometer coupling with pulsed relativity humidity(RH)was utilized to study the dynamic hygroscopicity of ammonium sulfate/glutaric acidaerosols.It showed that the glutaric acid decreases the deliquescence relativity humidity(DRH)and efflorescence relativity humidity(ERH)of ammonium sulfate.For ammonium sulfate/galutaric acid=1∶1mixing aerosols,the DRH is 71.7%.The glutaric aciddelayed the ERH of ammonium sulfate.