Issue 5, 2022

Evaluation of nano-silver concentrations using multi-media fate and transport models with different spatial resolutions

Abstract

Due to the complexity of the environmental matrix and the limitation of the detection level, it is important to use models to evaluate environmental exposure to nanomaterials. Based on this, this research established two multi-media fate and transport models of silver nanoparticles (AgNPs) with respective coarse and fine spatial resolutions. Using the case of the spatial distribution of AgNPs in the Xiangjiang River, China, we compared how the spatial resolution of a model impacts modeling results. The results show that the process of heterogeneous aggregation has the greatest impact on the modeled concentration of AgNPs in water, and the heterogeneous aggregation of free AgNPs with natural colloids and settling down to sediments is the dominant mechanism responsible for the loss of AgNPs. In addition, the use of different spatial resolutions gives similar trends in the modeled AgNPs concentration, despite the difference in absolute levels. Our work also shows that the reliability and accuracy of the rate constant of heterogeneous aggregation has a great influence on the modeled AgNPs concentrations.

Graphical abstract: Evaluation of nano-silver concentrations using multi-media fate and transport models with different spatial resolutions

Supplementary files

Article information

Article type
Paper
Submitted
24 Dec 2021
Accepted
14 Mar 2022
First published
15 Mar 2022

Environ. Sci.: Processes Impacts, 2022,24, 754-761

Evaluation of nano-silver concentrations using multi-media fate and transport models with different spatial resolutions

Y. Gao, X. Li, W. Wei, P. Huang, L. Li and Q. Wang, Environ. Sci.: Processes Impacts, 2022, 24, 754 DOI: 10.1039/D1EM00555C

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