The 2D H-1 NMR correlation maps of longitudinal (T-1) and transverse (T-2) relaxation times prove sensitive in monitoring the distribution of magnetic pore environments in porous systems. The comparison with MOssbauer data establishes a direct correspondence between the susceptibility-induced effects observed in the T-1-T-2 maps for pore-filling water and the Fe(III)-bearing magnetic compounds. (C) 2010 Elsevier B.V. All rights reserved.