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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 4.

FIGURE 4

Attachment efficiencies of citrate- and PVP-coated AgNPs as functions of (a) NaCl and (b) CaCl2 concentrations at pH 7.0. The attachment efficiencies of citrate-coated AgNPs in a and b are reproduced from Figures 3a and b, respectively. For citrate-coated AgNPs, the citrate concentration in the suspension was 0.13 μM. For PVP-coated AgNPs, the PVP concentration in the suspension was 0.88 mg/L TOC (equivalent to 0.14 μM PVP).