Symmetric Atmospheric Plasma Source Integrated With Electrospray Ionization for Ambient Mass Spectrometry Detections

摘要: This paper develops a symmetric atmospheric plasma source integrated with electrospray ionization (ESI) tip as dual-ion for simultaneously detecting nonpolar and polar compounds using the ambient mass spectrometry. A cross-shaped tube discharge electrodes is used to generate dielectric barrier produce ionized gas charging molecules, while coaxial capillary placed at center of generating discharge. Since there no floating voltage outlet tube, potential interference ESI can be excluded. Results show that stably high-intensity ions 109 ion $\cdot $ cm−3. Moreover, relationship between measured intensity flow rate, temperature, applied are systematically investigated. Various samples including volatile organic compounds, pesticides, Chinese herbal medicines, vitamins evaluating sensing performance in mode, respectively. developed dual efficient detect both compounds.