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| Effects of organic matter released from multi-source agricultural organic inputs on nanoplastic aggregation |
| Received:April 14, 2025 |
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| KeyWord:agricultural organic inputs;nanoplastics;heteroaggregation;dissolved organic matter（DOM）;Zeta potential |
| Author Name | Affiliation | E-mail | | ZHANG Xiaoyu | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | MA Jie | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | majie@caas.cn | | HUO Lili | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | SUN Yixuan | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China | | | LIU Yong | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | FENG Bingcong | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | |
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| Abstract: |
| To elucidate the mechanism by which dissolved organic matter（DOM） derived from agricultural organic inputs, surface functional group heterogeneity of nanoplastics（NPs）, and cation valence（Na+/Ca2+）synergistically regulate NPs aggregation, this study selected three types of DOM（BCDOM, WSDOM, CMDOM）along with non-functionalized NPs（NPs-Bare）, carboxyl-modified NPs（NPsCOOH）, and aldehyde-modified polystyrene NPs（NPs-CHO）. Aggregation kinetics experiments were conducted, combined with dynamic light scattering and Zeta potential analysis, to systematically investigate the coupling effects of DOM type, NPs functional groups, and electrolyte concentration（Na+ 100-800 mmol·L-1, Ca2+ 10-60 mmol·L-1）on NPs aggregation. The results demonstrated that：DOM effects exhibited significant source dependency. Protein-rich CMDOM showed the strongest inhibitory effect（near-complete stabilization）on all three NPs in Na+ systems, while highly aromatic BCDOM exhibited the weakest inhibition. WSDOM（containing lignin/carbohydrates）displayed an intermediate effect; In Na+ systems, DOM significantly increased the critical coagulation concentration（CCC）（e.g., CCCNa for NPs-Bare rose from 600 mmol·L-1 to 800 mmol·L-1）; High concentrations of Ca2+ mediated bridging effects, enabling CMDOM / WSDOM to promote aggregation of NPs-COOH/NPs-CHO（reducing CCC）. NPs functional groups significantly influenced DOM stabilization：CMDOM provided the strongest stabilization for NPs-COOH. While weaker for NPs-Bare than NPs-COOH, CMDOM′ s inhibitory effect on NPs-Bare was stronger than on NPs-CHO. NPs-CHO exhibited complex charge-dependent behavior. This study elucidates the mechanism of heterogeneous aggregation synergistically regulated by multi-source agricultural DOM, NPs functional group heterogeneity, and cation valence. Specifically, DOM source characteristics determine its inhibition efficiency, cation valence governs the direction of aggregation effects, and NPs functional group properties dictate the sensitivity of the aggregation response. |
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