3. Results and discussion
3.1. Pot trial 1
There were no significant differences in the above-ground
biomass (dry weight) of plants at harvest (p ≤ 0.05) (data not
shown). Shoot concentrations of Ag were considerably lower than
that of the soil (Fig. 1). This demonstrates that both Ag + and trans-
formed AgNPs (present in the applied biosolids) had very low
bioavailability to lettuce in this soil. The highest Ag shoot con-
centrations (138 ± 37 ?g Ag/kg) were found in plants that were
grown in AgNP-dosed soil (no biosolids). This soil also had the
highest Ag concentration (4.5 ± 0.3 mg Ag/kg) (Table 2). The results
also show that plant uptake of Ag cannot be predicted by soil Ag