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. 2022 Feb 14;119(8):e2121542119. doi: 10.1073/pnas.2121542119

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Copyright © 2022 the Author(s). Published by PNAS.

This open access article is distributed under Creative Commons Attribution License 4.0 (CC BY).

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Fig. 1. — NMR detection of H₂O₂ in various fluids. (A) Dependence of H₂O₂ concentration in EBC on the collected volume. The green dashed line represents the best fit to Eq. 1. (B) H₂O₂ levels in rainwater and samples condensed from ambient air on April 24, 2021. (C) NMR spectra of the rainwater samples. (D) NMR spectra of a 1-µM standard sample, sublimed (s-)urine, s-saliva, s-blood, s-MQ water, and MQ water.