The size distributions of particles in aqueous dispersions of TiO2 and
Fe2O3 determined by dynamic light scattering were compared with the s
ize distributions obtained by electron microscopy and gravitation sedi
mentation. Very good accordance of these methods has been found for Ti
O2 whereas Fe2O3 showed significant deviations in the similar sets of
values, probably due to a strong tendency to particle agglomeration.