The transport of heavy metals in the environment poses serious threats to ecological and human health. One major factor that influences the transport of heavy metals in the environment is interactions with microbial surfaces. To better understand the influence that endospores, a ubiquitous microbial surface in the environment, have on metal transport, we studied cadmium and uranium adsorption onto endospore surfaces. We focused on three main experiments: how fast metal adsorbs to spore surfaces (kinetics), the extent of metal adsorption, and the reversibility of metal-spore adsorption. These data are essential to deriving thermodynamic parameters that may quantify the interactions under conditions not directly studied in the laboratory. The ultimate goal of this research is to give environmental engineers the ability to incorporate microbe-metal interactions into geochemical models of contaminant transport and possibly aid in optimizing bioremediation strategies using endospores.