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H2O2 is not born at the air–water droplet surface
Sensitive assays show microdroplet H2O2 comes from dissolved O2 reacting at solid–water interfaces, not from ultrahigh fields at the air–water surface.
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What spontaneous H2O2 claim is being tested?
Tens of μM H2O2 at the aerial interface of water microdroplets from ultrahigh surface fields.
Source: Busting the myth of spontaneous formation of H<sub>2</sub>O<sub>2</sub> at the air-water interface: contributions of the liquid-solid interface and dissolved oxygen exposed · DOI · quote verified
What concentrations did prior spray/condensate papers report?
About 30 μM in ≤20 μm sprayed droplets and ≤115 μM in condensates at 40–70% RH.
Source: Busting the myth of spontaneous formation of H<sub>2</sub>O<sub>2</sub> at the air-water interface: contributions of the liquid-solid interface and dissolved oxygen exposed · DOI · quote verified
How much more sensitive is HPAK than PTO?
40-times lower LOD: ≥250 nM vs ≥10 μM.
Source: Busting the myth of spontaneous formation of H<sub>2</sub>O<sub>2</sub> at the air-water interface: contributions of the liquid-solid interface and dissolved oxygen exposed · DOI · quote verified
What did N2 glovebox condensates show vs bulk water?
Indistinguishable H2O2 concentrations.
Source: Busting the myth of spontaneous formation of H<sub>2</sub>O<sub>2</sub> at the air-water interface: contributions of the liquid-solid interface and dissolved oxygen exposed · DOI · quote verified
What H2O2 level do ultrasonic humidifiers make?
About 1 μM in reservoir, mist, and condensates.
Source: Busting the myth of spontaneous formation of H<sub>2</sub>O<sub>2</sub> at the air-water interface: contributions of the liquid-solid interface and dissolved oxygen exposed · DOI · quote verified
Where does O2 actually become H2O2 in ordinary aerated water?
At the solid–water interface, not the air–water surface.
Source: Busting the myth of spontaneous formation of H<sub>2</sub>O<sub>2</sub> at the air-water interface: contributions of the liquid-solid interface and dissolved oxygen exposed · DOI · quote verified
What trace level can clean glass–water contacts produce?
<0.5 μM, depending on surface-to-volume ratio.
Source: Busting the myth of spontaneous formation of H<sub>2</sub>O<sub>2</sub> at the air-water interface: contributions of the liquid-solid interface and dissolved oxygen exposed · DOI · quote verified
How were N2 condensates generated?
Gently heating water (50–70 °C) in a glovebox N2 environment.
Source: Busting the myth of spontaneous formation of H<sub>2</sub>O<sub>2</sub> at the air-water interface: contributions of the liquid-solid interface and dissolved oxygen exposed · DOI · quote verified
Which myths do the authors say are put to rest?
Ultrahigh instantaneous fields, the ‘microscale’ of droplets, and charge transfer between microdroplets.
Source: Busting the myth of spontaneous formation of H<sub>2</sub>O<sub>2</sub> at the air-water interface: contributions of the liquid-solid interface and dissolved oxygen exposed · DOI · quote verified
Why can tiny amounts still matter?
Surface-to-volume ratio can impact ultrasensitive studies of aqueous interfaces.
Source: Busting the myth of spontaneous formation of H<sub>2</sub>O<sub>2</sub> at the air-water interface: contributions of the liquid-solid interface and dissolved oxygen exposed · DOI · quote verified
Why was the original PTO assay a problem?
Detection limit ≥10 μM, much less sensitive than HPAK.
Source: Busting the myth of spontaneous formation of H<sub>2</sub>O<sub>2</sub> at the air-water interface: contributions of the liquid-solid interface and dissolved oxygen exposed · DOI · quote verified