Ionic Cluster Mass Spectrometry. I. Detection and Identification of Airborne Organic Vapors and Establishment of Operational Mechanisms in the Ionization Detector System.

摘要

An analytical technique called Ionic Cluster Mass Spectrometry (ICMS) has been developed. The technique is akin to chemical ionization mass spectrometry in that both concepts rely upon the mass analysis of ions that are products of ion-molecule reactions occurring in a reactant gas in the ion source. ICMS employs moist air as the reactant gas at ion source pressures of 10mmHg to 1 atmosphere. Samples can be injected directly into the ion source in a clean, moist airstream or ambient atmosphere may constitute the reactant gas plus sample. ICMS analyses of organic vapors in air have been used to aid in the establishment of response mechanisms in the Ionization Detector System (IDS). Ionic clusters to which the IDS respond have been identified. The conclusion drawn from these studies is that differential diffusion of ionic clusters from an airstream predominats in the physics of the response mechanism. (Author)