These complications include but are not limited to, the following: Stability of calibration standardsconcern of EtO degradation in calibration gas cylinders (USEPA 2019d) Canister bias and compound/matrix coelutions and interferences that may affect concentrationsconcern that electropolished canisters may not be suitable for EtO ambient monitoring, and that silicon-ceramic-lined canisters should be used instead (USEPA 2021c) Canister effectconcern that EtO may form inside certain canisters, resulting in a positive bias (USEPA 2021i) Data set size and sample location (e.g., rural, urban) should be taken into consideration before comparing values
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A more nuanced review of the rule and case law reveals important exceptions, writes David Kowalski
