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. Author manuscript; available in PMC: 2019 May 15.
Published in final edited form as: Environ Sci Technol. 2018 May 2;52(10):5968–5978. doi: 10.1021/acs.est.7b06099

Figure 2.

Figure 2.

During the ISO assay, positively charged ENPs produced large agglomerates on the bottom of the wells, and these agglomerates were not seen in wells containing neutral or negatively charged ENPs or in the negative control wells. The same concentrations were used for the different ENPs as were used in Figure 1. These images were taken of wells from the 12-well plates after conducting the ISO assay.