000030174 001__ 30174
000030174 041__ $$aEnglish
000030174 100__ $$aGantt, B.
000030174 245__ $$aNear-Road Modeling and Measurement of Cerium-Containing Particles Generated by Nanoparticle Diesel Fuel Additive Use
000030174 260__ $$c2014
000030174 269__ $$c2014/09/16
000030174 300__ $$a10607-10613
000030174 507__ $$aPrakash Bhave, ICIMOD staff, peerreviewed, Atmosphere
000030174 511__ $$aAtmosphere, atarticle
000030174 520__ $$aCerium oxide nanoparticles (nCe) are used as a fuel-borne catalyst in diesel engines to reduce particulate emissions, yet the environmental and human health impacts of the exhaust particles are not well understood. To bridge the gap between emission measurements and ambient impacts, size-resolved measurements of particle composition and mass concentration have been performed in Newcastle-upon-Tyne, United Kingdom, where buses have used an nCe additive since 2005. These observations show that the noncrustal cerium fraction thought to be associated with the use of nCe has a mass concentration ?0.3 ng m?3 with a size distribution peaking at 100?320 nm in aerodynamic diameter. Simulations with a near-roadway multicomponent sectional aerosol dynamic model predict that the use of nCe additives increases the number concentration of nuclei mode particles (<50 nm in diameter) while decreasing the total mass concentration. The near-road model predicts a downwind mass size distribution of cerium-containing particles peaking at 150 nm in aerodynamic diameter, a value similar to that measured for noncrustal cerium in Newcastle. This work shows that both the emission and atmospheric transformation of cerium-containing particles needs to be taken into account by regional modelers, exposure scientists, and policymakers when determining potential environmental and human health impacts.
000030174 700__ $$aHoque, S.
000030174 700__ $$aWillis, R. D.
000030174 700__ $$aFahey, K. M.
000030174 700__ $$aDelgado-Saborit, J. M.
000030174 700__ $$aHarrison, R. M.
000030174 700__ $$aErdakos, G. B.
000030174 700__ $$aBhave, P. V.
000030174 700__ $$aZhang, K. M.
000030174 700__ $$aKovalcik, K.
000030174 700__ $$aPye, H. O. T.
000030174 773__ $$pEnvironmental Science & Technology
000030174 773__ $$v48 (18)
000030174 773__ $$a10.1021/es502169p
000030174 8564_ $$uhttp://dx.doi.org/10.1021/es502169p$$yExternal link
000030174 980__ $$aARTICLE