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An aqueous dispersion of poly (acrylic acid)-stabilised cerium oxide (CeO 2 ) nanoparticles (PAA-CeO 2 ) was evaluated for its stability in a range of freshwater ecotoxicity media (MHRW, TG 201 and M7), with and without natural organic matter (NOM). In a 15day dispersion stability study, PAA-CeO 2 did not undergo significant aggregation in any media type. Zeta potential varied...