PMID- 32980607
OWN - NLM
STAT- MEDLINE
DCOM- 20210218
LR  - 20210218
IS  - 1879-2448 (Electronic)
IS  - 0043-1354 (Linking)
VI  - 187
DP  - 2020 Dec 15
TI  - Effects of Weathering on the Sorption Behavior and Toxicity of Polystyrene 
      Microplastics in Multi-solute Systems.
PG  - 116419
LID - S0043-1354(20)30954-4 [pii]
LID - 10.1016/j.watres.2020.116419 [doi]
AB  - Recent studies have demonstrated that weathering modifies the physicochemical 
      properties and sorption behavior of microplastics (MPs). However, little is known 
      about the effects of such weathering on the simultaneous sorption by MPs of 
      different organic pollutants in multi-solute systems. In this study, the role of 
      cosolute properties in the formation of solute multilayers with a hydrophobic 
      primary solute (4-MBC) on pristine and various weathered polystyrene MPs (PSMPs) 
      was examined. Three weathered PSMPs were studied namely, UV-irradiated PS 
      (UV-PS), microbially degraded PS (MD-NPS), and UV-irradiated PS with subsequent 
      microbial degradation (MD-UV-PS). The weathered PSMPs generally exhibited higher 
      degree of oxygenated functionalities with less surface hydrophobicity than 
      pristine particles. Our findings showed that the formation of solute multilayers 
      with hydrophobic cosolutes was drastically suppressed in UV-PS due to more severe 
      competition at hydrophobic sorption sites. Nevertheless, hydrophilic cosolutes 
      contributed to solute multilayer formation with 4-MBC on PSMPs after UV 
      irradiation, probably due to the stronger sorption of hydrophilic compounds to 
      the oxidized surfaces of these particles via enhanced H-bonding. Strikingly, the 
      sorption of 4-MBC by MD-UV-PS was notably enhanced when hydrophobic cosolutes 
      were present. The observed synergistic sorption indicates that adhered biofilms 
      and/or organic matter on MD-UV-PS could sorb the hydrophobic cosolute molecules, 
      and eventually promote sorption of 4-MBC. Our further toxicity tests revealed 
      that such solute multilayers formed on PSMPs inhibited microalgal growth. These 
      results suggest that the fate and biological effects of MP-mediated chemical 
      exposure could be strongly affected by weathering processes and coexistence of 
      multiple organic contaminants in natural environments.
CI  - Copyright (c) 2020 Elsevier Ltd. All rights reserved.
FAU - Ho, Wai-Kit
AU  - Ho WK
AD  - Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, HKSAR, 
      P.R.China.
FAU - Law, Japhet Cheuk-Fung
AU  - Law JC
AD  - Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, HKSAR, 
      P.R.China.
FAU - Zhang, Tong
AU  - Zhang T
AD  - Environmental Microbiome Engineering and Biotechnology Laboratory, Department of 
      Civil Engineering, The University of Hong Kong, HKSAR, P.R.China.
FAU - Leung, Kelvin Sze-Yin
AU  - Leung KS
AD  - Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, HKSAR, 
      P.R.China; HKBU Institute of Research and Continuing Education, Shenzhen Virtual 
      University Park, Shenzhen, P.R.China. Electronic address: s9362284@hkbu.edu.hk.
LA  - eng
PT  - Journal Article
DEP - 20200919
PL  - England
TA  - Water Res
JT  - Water research
JID - 0105072
RN  - 0 (Microplastics)
RN  - 0 (Plastics)
RN  - 0 (Polystyrenes)
RN  - 0 (Water Pollutants, Chemical)
SB  - IM
MH  - Adsorption
MH  - *Microplastics
MH  - Plastics
MH  - Polystyrenes
MH  - *Water Pollutants, Chemical/analysis/toxicity
OTO - NOTNLM
OT  - Algal toxicity
OT  - Microplastic
OT  - Multi-solute system
OT  - Organic UV filter
OT  - Sorption
OT  - Weathering
COIS- Declaration of Competing Interest The authors declare that they have no known 
      competing financial interests or personal relationships that could have appeared 
      to influence the work reported in this paper.
EDAT- 2020/09/28 06:00
MHDA- 2021/02/20 06:00
CRDT- 2020/09/27 20:26
PHST- 2020/06/04 00:00 [received]
PHST- 2020/09/08 00:00 [revised]
PHST- 2020/09/09 00:00 [accepted]
PHST- 2020/09/28 06:00 [pubmed]
PHST- 2021/02/20 06:00 [medline]
PHST- 2020/09/27 20:26 [entrez]
AID - S0043-1354(20)30954-4 [pii]
AID - 10.1016/j.watres.2020.116419 [doi]
PST - ppublish
SO  - Water Res. 2020 Dec 15;187:116419. doi: 10.1016/j.watres.2020.116419. Epub 2020 
      Sep 19.