Molecular Control of Reactive Gas Uptake “on Water”

Enami, Shinichi
Hoffmann, M. R.
Colussi, A. J.

Publication date

May 2010

Publisher

American Chemical Society (ACS)

Abstract

Reactive gas uptake on environmentally realistic aqueous surfaces is expected to be affected by a combination of multiple interactions. This issue is herein explored in experiments where the formation of Me_3NH^+ on neat and doped water microjets exposed to Me_3N(g) is monitored within <1 ms by online electrospray ionization mass spectrometry as a function of pH of the bulk liquid (pH_(BLK)). Notably, M_e3N(g) is protonated on the surface of neat water microjets below pH_(BLK)~4, rather than at pH_(BLK) pKA ≾ (Me_3NH^+) = 9.8 as in bulk water. Me_3N(g) uptake is significantly enhanced by anionic surfactants and fulvic acid (a surrogate of complex natural organic matter) above pH_(BLK)~4, uniformly depressed by cationics (which otherwise cou...

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Molecular Control of Reactive Gas Uptake “on Water”

Abstract

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Molecular Control of Reactive Gas Uptake “on Water”

Abstract

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