Articles | Volume 16, issue 7
Research article
 | Highlight paper
13 Apr 2023
Research article | Highlight paper |  | 13 Apr 2023

Ethylene oxide monitor with part-per-trillion precision for in situ measurements

Tara I. Yacovitch, Christoph Dyroff, Joseph R. Roscioli, Conner Daube, J. Barry McManus, and Scott C. Herndon


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Executive editor
I agree with the handling editor that the technique described is a breakthrough in analytical capability with potential wide ranging applications.
Short summary
Ethylene oxide is a toxic, carcinogenic compound used in the medical and bulk sterilization industry. Here we describe a precise and fast laser-based ethylene oxide monitor. We report months-long concentrations at a Massachusetts site, and we show how they suggest a potential emission source 35 km away. This source, and another, is confirmed by driving the instrument downwind of the sites, where concentrations were tens to tens of thousands of times greater than background levels.