Influence of dissolved oxygen on silver nanoparticle mobility and dissolution in water-saturated quartz sand

Effects of ultraviolet light on silver nanoparticle mobility and dissolution

“…Silver nanoparticles were prepared using previously described methods 23,24 with sodium borohydride (Alfa Aesar, Ward Hill, MA) as the reducing agent and silver nitrate (Sigma Aldrich, St. Louis, MO) as the precursor. The sodium borohydride reduction method produces a ca.…”

“…30 UV-vis spectra of nAg suspensions were monitored to assess changes in surface chemistry during UV light exposure. 24,31 An aliquot (1 mL) of nAg suspension was transferred to a glass cuvette (Shimadzu, Kyoto, Japan) and absorbance spectra (200-600 nm) were recorded using a spectrophotometer (UV-3100, Shimadzu). Transmission electron micrographs were collected using a JEOL-2100 (JEOL USA, Peabody, MA).…”

Silver Ion Release Accelerated in the Gastrovascular Cavity of Hydra vulgaris Increases the Toxicity of Silver Sulfide Nanoparticles

“…Dissolution of Ag + greatly depends on the chemical transformation of Ag‐NPs and environmental factors such as acidity (i.e., pH) and dissolved oxygen. The dissolution of Ag + from Ag‐NPs occurs more easily at lower pH values and higher dissolved oxygen conditions (Mittelman et al 2013; Peretyazhko et al 2014). In the present study, we transformed Ag‐NPs to Ag 2 S‐NPs according to different S/Ag ratios and verified the formation of Ag 2 S‐NPs by TEM and EDS analysis.…”

Combined influence of oxygenation and salinity on aggregation kinetics of the silver reference nanomaterial NM‐300K

“…Biological and ecological perturbations are strongly dependent on the physicochemical properties (size, surface reactivity, dissolution, etc.) For example, at low pH, significant dissolution of Ag þ (0.1 mg/L Ag þ at pH 4) was observed even at very low dissolved oxygen concentrations (<0.2 mg/L), indicating that Ag NPs have the potential to serve as long-term sources of Ag þ in hypoxic environments (Mittelman et al 2013). Determining how these physicochemical properties contribute to bioavailability, toxic responses in exposed organisms, and changes in ecosystem functioning is challenging.…”

“…The impacts of oxidative dissolution and chlorination of Ag NPs on aggregation have been previously reported . For example, at low pH, significant dissolution of Ag þ (0.1 mg/L Ag þ at pH 4) was observed even at very low dissolved oxygen concentrations (<0.2 mg/L), indicating that Ag NPs have the potential to serve as long-term sources of Ag þ in hypoxic environments (Mittelman et al 2013). Several studies have shown the effects of NPs in freshwater ecosystems, but reports involving media with salinity changes are scarce (Levard et al 2013).…”