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SCCS/1596/18 Final Opinion on Colloidal Silver (nano) __________________________________________________________________________________________ Figure 5: UV/Vis absorption spectrum of colloidal silver Ag 100 (dispersion I) (red). For comparison, the absorption spectrum of typical photocatalyst, P25 Degussa (with the same concentration of TiO2 as colloidal silver Ag 100, i.e. 35 ppm) is also shown (blue). 3.1.12. Surface characteristics Information on BET (Brunauer Emmett and Teller method) for the specific surface area measurement is only provided for colloidal silver dispersion G. For dispersion A, additional information has been provided both on the BET specific surface area as well as on the volume specific surface area (VSSA). For all other colloidal silver dispersions, this information is not provided. For all materials it was mentioned that they are uncoated materials. SCCS comment: Detailed information on nanomaterial surface characteristics must be provided. Information on the BET specific surface area of the nanomaterial and VSSA must be provided for each material (see Kreyling et al., 2010 and Wohlleben et al., 2017 for calculation of VSSA). It is noted that the BET-surface area can only be provided for the source material in powder form. Ref.: 38, 67 3.1.13. Droplet size in formulations No data provided. 17PDF Image | Consumer Safety SCCS OPINION ON Colloidal Silver (nano)
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