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The potential of C₆₀-nanoparticles (Buckminster fullerenes) as contaminant carriers in aqueous systems was studied in a series of toxicity tests with algae (Pseudokirchneriella subcapitata) and crustaceans (Daphnia magna). Four common environmental contaminants (atrazine, methyl parathion, pentachlorophenol (PCP), and phenanthrene) were used as model compounds, representing different physico-chemical properties and toxic modes of action. The aggregates of nano-C₆₀ formed over 2 months of stirring in water were mixed with model compounds 5 days prior to testing. Uptake and excretion of phenanthrene in 4-days-old D. magna was studied with and without addition of C₆₀ in aqueous suspensions. It was found that 85% of the added phenanthrene sorbed to C₆₀-aggregates >200nm whereas about 10% sorption was found for atrazine, methyl parathion, and pentachlorophenol. In algal tests, the …