New DEEPICE publication: Atmospheric CFC-11 and CCl4: A free calibration standard for PTR-MS

Proton-transfer-reaction mass spectrometry (PTR-MS) is an analytical technique used to monitor volatile organic compounds in real-time. For quantitative analysis, compounds of interest are typically calibrated using gas standards, but PTR-MS is quantitative to uncalibrated compounds if the mass-dependent transmission is well defined. However, long-term measurements are challenging due to the drift in transmission over time. Performing frequent calibrations helps, but the methods are time-consuming and tedious, often leading to instruments being under-calibrated. Hanne Noto et al show the use of long-lived and globally monitored compounds in the atmosphere as a tool to constrain the transmission between calibrations.

Read more about this research here: https://www.sciencedirect.com/science/article/pii/S1387380624001222