When substances are reduced to minute particle sizes 1 – 100 nanometres, we have nanoparticles. Nanoparticles have different and very useful physical and chemical properties (size, surface coating, charge, etc.) which make them behave differently compared to their larger forms. These properties are used to design nano-products for many applications: medical, electronic, transportation, food, etc. Silver can fight infections therefore, a large number of nanoproducts contain nanosilver. Extensive use of nanosilver products increases the risks for environmental release, raising environmental and health hazard concerns. This research focused on how the size and surface coating of silver nanoparticles may affect their uptake by soil organisms, as well as the adverse effects of such uptake. It was shown that the type of surface coating applied on silver nanoparticle was more important than its size in determining both uptake and effects. Such information can be used to assess risks of silver nanoparticles to organisms.