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. Author manuscript; available in PMC: 2012 Jul 1.
Published in final edited form as: Environ Sci Technol. 2011 Jun 1;45(13):5564–5571. doi: 10.1021/es200157h

FIGURE 5.

FIGURE 5

Attachment efficiencies of citrate-coated AgNPs in the absence and in the presence of humic acid (1 mg/L TOC) as functions of (a) NaCl and (b) CaCl2 concentrations at pH 7.0. The attachment efficiencies of citrate-coated AgNPs in the absence of humic acid in a and b are reproduced from Figures 3a and b, respectively. For all experiments, the citrate concentration in the suspension was 0.13 μM.