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Dissolved Zn fraction measured in nanocosm medium following addition of 0.8 mg Zn/L after 24 (A) and 120 (B) h for each exposure scenario (Daphnia at 120 h were not measured because of limited survival after 48 h). Error bars represent the standard error derived for triplicate samples. *Significant difference between Zn types. MP = microparticle; NP = nanoparticle.
