Figures & data
Figure 1. Overview of the experimental setup for testing the influence of aging (0–7 days) on the characteristics and 2-h algal toxicity of citrate stabilized AgNPs (AgNP1). Seven identical sets of test concentrations covering the range 10–1000 µg Ag L−1 were prepared in ISO 8692 algal medium on day 0 and aged in the dark on a shaker (300 rpm) before testing and characterization was conducted after 0, 1, 2, 3, 4, 5 or 7 days.
Table 1. Effective concentrations (EC10- and EC50-values) and 95% confidence intervals in µg Ag L−1 from 2-h 14C-assimilation and 48-h growth inhibition algal tests with AgNO3 and AgNPs (freshly prepared).
Figure 2. Concentration–response data and fitted curves by Log457 from 2-h 14C-assimilation algal tests with AgNP1 (A and B) and AgNP2 (C and D) being freshly prepared (A and C) or aged for 24 h in ISO 8692 algal medium in the dark (B and D). For each scenario (A–D) two individual test runs were conducted.
Figure 3. Concentration–response data and fitted curves by Log457 from 2-h algal 14C-assimilation algal tests with AgNP1 after aging in ISO 8692 algal medium (A) for 0–2 days, (B) for 3–5 days, (C) for 7 days. The EC50-values with 95% confidence intervals are plotted for suspensions aged for 05 days (D).
