However, it was just the opposite for carbamates. The S/N was better from ESI than from APCI or APPI. A small amount of post-column acetone was needed in the APPI source as a photoionizable dopant for charge transfer tothe analyte.Chin-Kai Meng...
大气压化学电离(APCI) : 气相化学电离 (CI)过程中溶剂相当于CI反应气来使样品电离。 大气压光致电离 (APPI): Krypton氪灯产生的紫外光电离气相样品或参加随后的气相反应。 第四页,共30页。 LC/MS 技术(jìshù)的相对适用性 第五页,共30页。 液质联用技术(jìshù)的相对适用范围 分子量 分析(fēnxī)物...
* ) * * Over the past several decades, a number of different LC/MS interfacing techniques have been developed in an effort to address the requirements of an ideal LC/MS interface. The two relatively recently developed and closely related Atmospheric Pressure Ionization (API) techniques of APCI ...
For these reasons, APCI and Electrospray have rapidly become the predominant LC/MS interfaces. It is important to note that many analytes will work by either interface! * The steps need to be clearly labeled so that the student understands the order in which they happen. These slides need to...