Radwan Islam M, Gitipour Alireza, Potter Phillip M, Dionysiou Dionysios D, Al-Abed Souhail R
University of Cincinnati, Environmental Engineering and Science Program, Department of Chemical and Environmental Engineering (ChEE), 2600 Clifton Avenue, Cincinnati, OH 45221-001, United States.
National Institute of Oceanography and Fisheries , Marine Chemistry Department, Environmental Division, Qayet-Bey, Al-Anfoushy, Alexandria 21556, Egypt.
J Nanopart Res. 2019 Jul 9;21(7):1-155. doi: 10.1007/s11051-019-4597-z.
The utilization of silver nanoparticles (AgNPs) in consumer products has significantly increased in recent years, primarily due to their antimicrobial properties. Increased use of AgNPs has raised ecological concerns. Once released into an aquatic environment, AgNPs may undergo oxidative dissolution leading to the generation of toxic Ag. Therefore, it is critical to investigate the ecotoxicological potential of AgNPs and determine the physicochemical parameters that control their dissolution in aquatic environments. We have investigated the dissolution trends of aqueous colloidal AgNPs in five products, marketed as dietary supplements and surface sanitizers. The dissolution trends of AgNPs in studied products were compared to the dissolution trends of AgNPs in well-characterized laboratory-synthesized nanomaterials: citrate-coated AgNPs, polyvinylpyrrolidone-coated AgNPs, and branched polyethyleneimine-coated AgNPs. The characterization of the studied AgNPs included: particle size, anion content, metal content, silver speciation, and capping agent identification. There were small differences in the dissolved masses of Ag between products, but we did not observe any significant differences in the dissolution trends obtained for deionized water and tap water. The decrease of the dissolved mass of Ag in tap water could be due to the reaction between Ag and Cl, forming AgCl and affecting their dissolution. We observed a rapid initial Ag release and particle size decrease for all AgNP suspensions due to the desorption of Ag from the nanoparticles surfaces. The observed differences in dissolution trends between AgNPs in products and laboratory-synthesized AgNPs could be caused by variances in capping agent, particle size, and total AgNP surface area in suspensions.
近年来，银纳米颗粒（AgNPs）在消费品中的使用显著增加，主要是由于其抗菌特性。AgNPs使用量的增加引发了生态方面的担忧。一旦释放到水生环境中，AgNPs可能会发生氧化溶解，导致产生有毒的银。因此，研究AgNPs的生态毒理学潜力并确定控制其在水生环境中溶解的物理化学参数至关重要。我们研究了作为膳食补充剂和表面消毒剂销售的五种产品中水性胶体AgNPs的溶解趋势。将研究产品中AgNPs的溶解趋势与特征明确的实验室合成纳米材料（柠檬酸盐包覆的AgNPs、聚乙烯吡咯烷酮包覆的AgNPs和支化聚乙烯亚胺包覆的AgNPs）中AgNPs的溶解趋势进行了比较。所研究的AgNPs的表征包括：粒径、阴离子含量、金属含量、银形态和封端剂鉴定。产品之间银的溶解质量存在微小差异，但我们未观察到去离子水和自来水中获得的溶解趋势有任何显著差异。自来水中银溶解质量的下降可能是由于银与氯反应形成氯化银并影响其溶解。由于银从纳米颗粒表面解吸，我们观察到所有AgNP悬浮液中银的初始快速释放和粒径减小。产品中的AgNPs与实验室合成的AgNPs之间观察到的溶解趋势差异可能是由于封端剂、粒径和悬浮液中AgNP总表面积的差异所致。
