Plasma‐based ambient mass spectrometry: Recent progress and applications

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Abstract
Ambient mass spectrometry (AMS) has grown as a group of advanced analytical techniques that allow for the direct sampling and ionization of the analytes in different statuses from their native environment without or with minimum sample pretreatments. As a significant category of AMS, plasma‐based AMS has gained a lot of attention due to its features that allow rapid, real‐time, high‐throughput, in vivo, and in situ analysis in various fields, including bioanalysis, pharmaceuticals, forensics, food safety, and mass spectrometry imaging. Tens of new methods have been developed since the introduction of the first plasma‐based AMS technique direct analysis in real‐time. This review first provides a comprehensive overview of the established plasma‐based AMS techniques from their ion source configurations, mechanisms, and developments. Then, the progress of the representative applications in various scientific fields in the past 4 years (January 2017 to January 2021) has been summarized. Finally, we discuss the current challenges and propose the future directions of plasma‐based AMS from our perspective.

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