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There is a growing interest in the potential role of colloids in radionuclide migration processes. In the present studies, which are related to low and intermediate level waste, it has been shown that colloids can be generated from cement systems. The characteristics of such colloids which occur in OPC leachates, are complex and have been investigated using a range of techniques which include photon correlation spectroscopy, electrophoretic light scattering and ultrafiltration. Scanning electron microscopy and EDAX measurements have also provided insight into the mechanisms of formation and sorption behaviour of colloids which may be generated. The application of inductively coupled plasma emission and mass spectrometry in recent colloid sorption investigations using cements spiked with actinides and fission product simulants is also illustrated.