This work investigates the mobility of nanogold (nAu) particles through porous media as a precursor to understanding the potential transport of nanoparticles in the environment.� For this work, citrate-coated nanogold particles (mean particle diameter (MPD) of approx. 41 nm) were synthesized in batch and purified using ultrafiltration.� A pulse of a 4 ppm (w/v) particle suspension (in 20 mM NaBr background with bromide used as the tracer) was leached at 0.4 ml min^-1 through duplicate columns packed with fine sand.� Effluent was collected using a fraction collector, and analyzed for a variety of solution and particle experimental endpoints.� The experimental data showed that the relative effluent nAu concentration (C/Co) approached unity by approx. 33 pore volumes of leaching.� nAu breakthrough curves showed significant retention (compared to the bromide tracer) yet there was little evidence of particle straining in spite of high accumulation of Au within the column.� DLS data showed that the effluent particles were increasingly polydisperse with continued leaching, containing a MPD of approx. 90 nm.� These results showed that the small particle size did facilitate short-distance movement of nAu through the fine sand, however, significant NP loss from the effluent occurred through particle attachment and/or "exchange" with the sand as well as aggregation, most likely due to the higher particle concentrations in the intrapore spaces.��