Figure 2: Dynamic Light Scattering (DLS) size distributions for (a) the nanosilver stock preparation (red line) along with the pH 6.9 200 mg L−1 NaCl solvent condition 5 min (black line), 1 hour (blue line), and 24 hours (green line). (b) The nanosilver mixed with head tank water directly (1 : 1) (black line), after 30 min (blue line), and 24 hours (green line). Data are presented as mean value ± SE.