Institute F.-A. Forel, University of Geneva, Faculty of Science, Uni Carl Vogt, Group of Environmental Physical Chemistry, 66, Boulevard Carl-Vogt, CH 1211 Geneva, 4, Switzerland.
Sci Total Environ. 2016 Aug 15;562:327-334. doi: 10.1016/j.scitotenv.2016.03.184. Epub 2016 Apr 19.
Understanding the behavior of engineered nanoparticles in natural water and impact of water composition in changing conditions is of high importance to predict their fate once released into the environment. In this study we investigated the stability of uncoated and Suwannee River fulvic acids coated CeO2 manufactured nanoparticles in various environmental conditions. The effect of pH changes on the nanoparticle and coating stability was first studied in ultrapure water as well as the variation of zeta potentials and sizes with time in presence of fulvic acids at environmental pH. Then the stability of CeO2 in synthetic and natural Lake Geneva waters was investigated as a function of fulvic acids concentration. Our results indicate that the adsorption of environmentally relevant concentrations of Suwannee River fulvic acids promotes CeO2 stabilization in ultrapure water as well as synthetic water and that the coating stability is high upon pH variations. On the other hand in natural Lake Geneva water CeO2 NPs are found in all cases aggregated due to the effect of heterogeneous organic and inorganic compounds.
了解工程纳米粒子在天然水中的行为以及水成分在变化条件下的影响对于预测它们一旦被释放到环境中的命运非常重要。在这项研究中，我们研究了未涂层和苏湾河富里酸涂层 CeO2 制造纳米粒子在各种环境条件下的稳定性。首先研究了 pH 值变化对纳米粒子和涂层稳定性的影响，在超纯水中以及在环境 pH 值下富里酸存在时，zeta 电位和粒径随时间的变化。然后，研究了 CeO2 在合成和天然日内瓦湖水中的稳定性，作为富里酸浓度的函数。我们的结果表明，环境相关浓度的苏湾河富里酸的吸附促进了 CeO2 在超纯水中以及合成水中的稳定，并且在 pH 值变化时涂层稳定性很高。另一方面，在天然日内瓦湖水中，由于异质有机和无机化合物的影响，CeO2 NPs 在所有情况下都被发现聚集。
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