Nuclear magnetic resonance (NMR) spectroscopy encompasses a large range of techniques that can probe both the structure and dynamics of materials in detail. In this paper, we discuss a new method for estimating the average concentration of adsorbed polymer layers in concentrated dispersions from NMR solvent diffusion measurements. The average concentration of the adsorbed polymer layer modelled as a spherical block is shown to depend on particle volume fraction, polymer molecular weight and adsorbed amount. Desorption has also been induced and the removal of the layer observed through changes in the diffusional behaviour of the solvent.