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A switchable reagent ion high resolution time-of-flight chemical ionization mass spectrometer for real-time measurement of gas phase oxidized species: characterization from the 2013 Southern Oxidant and Aerosol Study

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Academic year: 2017

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Figure 1. Schematic of the SRI-HR-TOF-CIMS including the di ff erent regions of the atmo- atmo-spheric pressure interface
Figure 2. Schematic of the sampling and calibration setup during SOAS. The reduced pressure inlet and associated controls include two mass flow meters (MFM), a pressure transducer, needle valve actuator, pump, and computer PID controls
Figure 3. The calibration regimen was conducted hourly during SOAS, and allowed for calibra- calibra-tion of formic acid in both dry Ultra Zero air (total hydrocarbon content < 0.01 ppm) and ambient air.
Figure 4. Time series of calculated limit of detection (LOD, circles) and limit of quantification (LOQ, crosses) for formic acid during hourly external standard (black) and standard addition (red) calibrations at SOAS while operating the instrument in acet
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