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Updated: May 2, 2026

Protocol for Microplastics Sampling on the Sea Surface and Sample Analysis
Published on: December 16, 2016
Nanoscale interaction mechanism between bubbles and microplastics under the influence of natural organic matter in
Yan Xiang1, Zhoujie Wang2, Jing Liu3
1School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, PR China.
Abstract:
Bubble-microplastic (MP) interaction is a significant process that changes the routes of MP circulation in marine environment and thereby determines the risk of MPs, which could be strongly influenced by natural organic matter (NOM) in oceans. However, the quantitative interaction mechanisms between bubbles and MPs under the effect of NOM remain elusive. Herein, bubble-MP interactions in simulated seawater were quantified at nanoscale based on atomic force microscope coupled with the Stokes-Reynold-Young-Laplace model. Bubble-polystyrene (PS)/polyvinyl chloride (PVC) MP interactions exhibited stronger hydrophobic interactions (decay length D0 of 0.60 ± 0.03 nm/0.43 ± 0.02 nm for PS/PVC MP) than polymethyl methacrylate (PMMA) MPs. Humic acid (HA) considerably reduced the D0 of hydrophobic interaction from 0.43-0.60 nm to 0.30-0.32 nm for PS and PVC MPs by introducing oxygen-containing components as evidenced by spectroscopic analysis. In contrast, alginate (Alg) accumulated less on PS/PVC MP surfaces, thereby negligibly affecting the D0 value. While for PMMA MPs, virtually identical D0 values were observed despite the presence of HA/Alg. Therefore, the bubble-driven transport of PS/PVC MPs were modulated by different types of NOM, whereas PMMA MPs could only be slightly affected. This work provides nanoscale insights into quantitative bubble-MP interactions, shedding light on understanding MPs global cycling.
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