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Dose–response curves of average well color development (AWCD) of soil extracts exposed to suspensions of (A) AgNPs(total) and AgNO3, and (B) AgNPs(particle) expressed as time weighted concentrations. AWCD are plotted on the y-axis, actual log-transformed Ag concentrations are plotted on the x-axis. Data are mean ± SD (n = 3). (AgNP1:50–80 nm nanoplates, AgNP2:15 nm nanospheres, AgNP3:20–40 nm nanospheres, and AgNP4:50 nm nanorods).
