Heterogeneous reaction of NO2 with sea salt particles

To understand how NO2 reacts with sea salt particles in the atmosphere of Mega-cities in coastal zones, the heterogeneous reaction of NO2 on the surface of wet sea salt was investigated with diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and ion chromatography (IC). Kinetic measurements indicated that nitrate formation on sea salt was second order in NO2 concentration and reactive uptake coefficients were (5.51 +/- 0.19) x 10(-7) and 1.26 +/- 10(-6) respectively under 0% and 20% relative humidity (RH) at NO2 molecular concentration of 1.96 x 10(15) mol/cm(3). The results showed that liquid water was formed at the site of MgCl2 center dot 6H(2)O, CaCl2 center dot 2H(2)O on the surface of sea salt and made the reaction more sustainable by releasing hydrated water and absorbing water from air even under a low RH (a (c) 1/2 30%). Therefore, pure NaCl particles should not be used to represent sea salt in studies of the heterogeneous reaction with NO2.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000285366200030&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Chemistry, MultidisciplinarySCI(E)EI7ARTICLE122652-26565