ABSTRACT
This paper presents results of field investigations on colloid transport downstream of a contaminant plume. The natural inorganic colloid load in hydrochemical undisturbed areas of the test site showed concentrations of less than 10 µg/L compared to 1.4–2 mg/L of macromolecular organic carbon. Inorganic colloid concentrations increased to 0.1 — 1 mg/L in the redox zoning area. The transition between the sulphate reduction and Fe(III) reduction is the major process for colloid release.
