期刊
ENVIRONMENTAL RESEARCH
卷 200, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2021.111424
关键词
Microplastics (MPs); Algal-derived organic matter (AOM); Molecular weight fraction; MP-AOM interaction; Additive release
资金
- National Natural Science Foundation of China [41807464, 51922101, 51979265]
- Natural Science Foundation of province, China [BK20190049]
- Youth Innovation Promotion Association CAS [2016286]
- Higher Education Science Research Project of Anhui [KJ2018A0056]
- State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology [2019KFKT-11]
The behavior and fate of microplastics (MPs) are closely related to their interactions with surrounding organic matters, with high molecular weight (HMW) organic substances showing stronger affinity towards MPs compared to low molecular weight (LMW) counterparts. Aromatic protein-like substances in HMW fraction exhibited higher adsorption affinity to MPs, offering more binding sites for additives to inhibit the release of organic substances. The MW- and component-dependent heterogeneities of organic matter samples must be considered in evaluating the environmental behavior of MPs.
As the emerging contaminants, the behavior and fate of microplastics (MPs) were highly related to the interactions with surrounding organic matters. However, information on the effects of molecular sizes of organic matters on the interaction is still lacking. In this study, the bulk algal-derived organic matter (AOM) samples were obtained and further fractionated into high molecular weight (HMW-, 1kDa-0.45 mu m) and low molecular weight (LMW-, 1 kDa) fractions. The interaction between MPs [polyethylene (PE) and polystyrene (PS)] and these MW-fractionated AOMs were characterized by dissolved organic carbon, fluorescence and absorbance spectroscopy, and fourier transform infrared (FTIR) analysis. Results showed that presence of AOM could effectively inhibit the release of additives from MPs. Further analysis found that the inhibition extents decreased in the order of HMW- bulk > LMW-AOM. The absorbance and fluorescence spectroscopy showed that aromatic protein-like substances in HMW fraction exhibited higher adsorption affinity to MPs than the bulk and LMW counterparts. The strong sorption of aromatic substances may offer more binding sites for additives to inhibit the release of organic substances. Moreover, two dimensional FTIR correlation spectroscopy revealed that the HMW non-aromatic substances were preferentially adsorbed onto PS, which led to an enhanced adsorption capacity to additives by forming H-bonding. Therefore, the MW- and component-dependent heterogeneities of AOM samples must be fully considered in evaluating the environmental behavior of MPs.
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