Figure 3 : Silver size distribution in tap water, green water, and brown water with: A) AgNPs and B) AgNO3 treatment. The initial silver concentrations measured in water were: tap water=25 ug/L, green water=28 ug/L, brown water=34 ug/L. The silver concentrations measured were performed in the filtrate fractions. Dissolved silver was found in the 1 kDa membrane permeate fraction (1.5 nm). A higher silver concentration was measured with AgNO3 in 100 and 50 nm fractions rather than with AgNPs. No dissolved silver was observed in the 1.5 nm fraction with AgNPs instead of AgNO3.