@article {105,
	title = {Heterogeneous Uptake and Adsorption of Gas-Phase Formic Acid on Oxide and Clay Particle Surfaces: The Roles of Surface Hydroxyl Groups and Adsorbed Water in Formic Acid Adsorption and the Impact of Formic Acid Adsorption on Water Uptake.},
	journal = {Journal of Physical Chemistry A},
	volume = {117},
	year = {2013},
	note = {CAPLUS AN 2013:1536458(Journal; Online Computer File)},
	pages = {11316 - 11327},
	publisher = {American Chemical Society},
	abstract = {Org. acids in the atm. are ubiquitous and are often correlated with mineral dust aerosol.  Heterogeneous chem. and the uptake of org. acids on mineral dust particles can potentially alter the properties of the particle.  In this study, heterogeneous uptake and reaction of formic acid, HCOOH, the most abundant carboxylic acid present in the atm., on oxide and clays of the most abundant elements, Si and Al, present in the Earth{\textquoteright}s crust are investigated under dry and humid conditions.  In particular, quant. adsorption measurements using a Quartz Crystal Microbalance (QCM) coupled with spectroscopic studies using Attenuated Total Reflection Fourier Transform IR (ATR-FTIR) spectroscopy are combined to allow for both quantification of the amt. of uptake and identification of distinct adsorbed species formed on silica, alumina, and kaolinite particle surfaces at 298 K.  These oxides and clay particles show significant differences in the extent and speciation of adsorbed HCOOH due to inherent differences in surface -OH group reactivity.  Adsorbed water, controlled by relative humidity, can increase the irreversible uptake of formic acid.  Interestingly, the resulting layer of adsorbed formate on the particle surface decreases the particle hydrophilicity thereby decreasing the amt. of water taken up by the surface as measured by QCM.  Atm. implications of this study are discussed. [on SciFinder(R)]},
	keywords = {heterogeneous uptake adsorption gas phase formic acid oxide clay},
	isbn = {1089-5639},
	author = {Rubasinghege, Gayan and Ogden, Saralyn and Baltrusaitis, Jonas and Grassian, Vicki H.}
}
@article {135,
	title = {Heterogeneous Atmospheric Chemistry of Lead Oxide Particles with Nitrogen Dioxide Increases Lead Solubility: Environmental and Health Implications.},
	journal = {Environmental Science \& Technology},
	volume = {46},
	year = {2012},
	note = {CAPLUS AN 2012:1499142(Journal; Online Computer File)},
	month = {2012///},
	pages = {12806 - 12813},
	publisher = {American Chemical Society},
	abstract = {The heterogeneous chem. of NO2 with Pb-contg. particles was examd. to better understand Pb metal mobilization in the environment.  In particular, PbO particles, a model Pb-contg. compd. due to its widespread presence as a Pb paint and as naturally-occurring mineral (massicot, and litharge) component, were exposed to NO2 at different relative humidities.  XPS showed that upon exposure to NO2, the PbO particle surface reacts forming adsorbed NO3- and Pb(NO3)2 thin films; the extent of NO3- formation was relatively humidity dependent.  NO2-exposed PbO particles had an increased amt. of Pb which dissolved in aq. suspensions at circumneutral pH vs. unexposed particles.  Results identified the potential importance and impact that heterogeneous chem. with trace atm. gases can have on increasing soly. and hence the mobilization of heavy metals such as Pb in the environment.  Results also showed that surface intermediates which form, such as adsorbed Pb(NO3)2, can yield higher Pb concns. in water, including drinking, estuary, and lake water, and groundwater. [on SciFinder(R)]},
	keywords = {air water soil pollution lead following nitrogen dioxide reaction, environmental health implication lead oxide reaction nitrogen dioxide, lead oxide particle heterogeneous atm chem, nitrogen dioxide reaction lead oxide particle increased lead soly},
	isbn = {0013-936X},
	author = {Baltrusaitis, Jonas and Chen, Haihan and Rubasinghege, Gayan and Grassian, Vicki H.}
}
