Paper-based filter membrane for high-efficient sampling and direct mass spectrometric analysis of siloxanes in outdoor air

Niu, Zhifeng; Shi, Jun; Ze-ru, XU; Zheng, Yuhua; Xiang, Zhicheng; Zhao, Jia; Zhang, Zhiping

doi:10.1016/j.atmosenv.2021.118427

Cited by 1 publication

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“…Ambient ionization mass spectrometry (MS) has gained widespread attention since the introduction of desorption electrospray ionization (DESI) by Cooks and co-workers in 2004, and diverse protocols , have been developed so far. Due to the unique features of operating at atmospheric pressure with little or no sample pretreatment, ambient ionization sources coupled to MS have been applied extensively for the rapid identification and semi-quantification of diverse compounds of interest in biological samples, − foodstuffs, , forensics, environmental matrixes, and chemical reactions. , According to the properties of ambient ionization, , they can be classified into spray-based (e.g., DESI) and plasma-based (e.g., direct analysis in real time (DART)) techniques. The major difference between both categories lies that target analytes with the former are charged via solvents upon high voltage, while the ones with the latter are ionized by the reactive species generated in a plasma plume.…”

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confidence: 99%

Focusing Plasma Desorption/Ionization Mass Spectrometry

et al. 2022

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A plasma-based source named focusing plasma desorption/ionization (FPDI) is described, which applies a high direct current voltage between a metal wire inside a polymeric hollow truncated cone and a piece of a one-sided coated conducting paper substrate. The conducting paper acts as both the counter electrode and the sample carrier. Upon the generation of a visible plasma beam, it would directly ionize the samples spotted on the conducting paper substrate or located around the plasma beam. The signal intensity of target analytes in mass spectrometric analysis is dependent highly on whether the conducting paper substrate is grounded or not, the type of conducting paper substrate, the inside diameter of the polymeric hollow truncated cone tip, the metal wire tip-topolymer tip distance, the polymer tip-to-paper substrate distance, the applied voltage, and the helium flow rate. Based on the experimental observation, a plausible mechanism is proposed for the generation of the plasma beam from FPDI. Compared to the available low-temperature plasma, flowing atmospheric-pressure afterglow, and helium plasma ionization sources, FPDI has demonstrated higher sensitivity and better compatibility with commercial mass spectrometers without any extra power supplies. As a proof of concept, FPDI coupled with a mass spectrometer has also been applied for the discrimination of different brands of gasoline and determination of solid tablets and pesticides with limits of detection in the range of 2.2 to 30.7 ng mL −1 .

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