Department of Environmental Geosciences, University of Vienna, Althanstrasse 14, Vienna 1090, Austria.
Environ Pollut. 2010 Dec;158(12):3472-81. doi: 10.1016/j.envpol.2010.05.007. Epub 2010 Aug 17.
Assessment of the behavior and fate of engineered nanoparticles (ENPs) in natural aquatic media is crucial for the identification of environmentally critical properties of the ENPs. Here we present a methodology for testing the dispersion stability, ζ-potential and particle size of engineered nanoparticles as a function of pH and water composition. The results obtained from already widely used titanium dioxide nanoparticles (Evonik P25 and Hombikat UV-100) serve as a proof-of-concept for the proposed testing scheme. In most cases the behavior of the particles in the tested settings follows the expectations derived from classical DLVO theory for metal oxide particles with variable charge and an isoelectric point at around pH 5, but deviations also occur. Regardless of a 5-fold difference in BET specific surface area particles composed of the same core material behave in an overall comparable manner. The presented methodology can act as a basis for the development of standardised methods for comparing the behavior of different nanoparticles within aquatic systems.
评估工程纳米粒子（ENPs）在自然水介质中的行为和归宿对于识别 ENPs 的环境关键特性至关重要。在这里，我们提出了一种测试工程纳米粒子的分散稳定性、ζ-电位和粒径随 pH 值和水成分变化的方法。已经广泛使用的二氧化钛纳米粒子（Evonik P25 和 Hombikat UV-100）的结果作为所提出的测试方案的概念验证。在大多数情况下，在测试条件下颗粒的行为符合从经典 DLVO 理论推导出来的预期，对于具有可变电荷和等电点在 pH 值 5 左右的金属氧化物颗粒，但也存在偏差。无论比表面积在 BET 上相差 5 倍，由相同核心材料组成的颗粒总体上表现出类似的行为。所提出的方法可以作为开发标准化方法的基础，用于比较不同纳米颗粒在水系统中的行为。
