To study the stability of NPs in the water, 50 nm and 100 nm citrate-capped
AgNPs and 60 nm 100 nm tannic-capped AuNPs were spiked in
the filtered natural water and effluent water respectively, and the NPs
were investigated during a ten-day incubation period. The average diameters
of AgNPs and AuNPs after first day were presented in the
Table 7. Table SI-3 showed particle number concentration recoveries
of AuNPs and AgNPs spiked into filtered HuNan University effluent
and Xiangjiang River after first day.