ar0005">Humic substances (HS) from compost showed good surfactant properties.
ar0010">Soil aging changed the distribution of Zn, Ni and Cu but not that of Pb and Cd.
ar0015">Cu, Ni and Zn removal with HS was greater in soils that had been aged less.
ar0020">Pb and Cd removal with HS was not affected by soil aging.