PMID- 35716893
OWN - NLM
STAT- MEDLINE
DCOM- 20220727
LR  - 20220727
IS  - 1873-6424 (Electronic)
IS  - 0269-7491 (Linking)
VI  - 308
DP  - 2022 Sep 1
TI  - Studying the combined influence of microplastics' intrinsic and extrinsic 
      characteristics on their weathering behavior and heavy metal transport in storm 
      runoff.
PG  - 119628
LID - S0269-7491(22)00842-9 [pii]
LID - 10.1016/j.envpol.2022.119628 [doi]
AB  - The weathering and contaminant transport behavior of both primary (PMPs) and 
      secondary microplastics (SMPs) are interrelated to their original physiochemical 
      features and variations within the environment. This study examines the influence 
      of PMPs' intrinsic characteristics (polymer structure and crystallinity) and 
      SMPs' extrinsic features (surface oxidation and external sediments attachment) on 
      the photodegradation kinetics, and subsequently Pb(II) and Zn(II) uptake from 
      stormwater. For this purpose, high density polyethylene (HDPE) and low density 
      polyethylene (LDPE) with different degrees of crystallinities were produced as 
      PMPs, and their photodegradation behaviors were compared with original polymers. 
      Furthermore, the SMPs generated by abrasion and surface oxidation of PMPs and the 
      virgin PMPs underwent accelerated photodegradation, and the changes of their 
      crystallinity, surface chemistry, and morphology were examined. Scanning electron 
      microscopy (SEM) imaging and X-ray photoelectron (XPS) studies revealed the 
      formation of cracks and different oxidized functionalities on MPs surface due to 
      UV photodegradation. The vinyl and carbonyl indices calculated using Attenuated 
      Total Reflectance Fourier Transform Infrared (ATR-FTIR) spectroscopy demonstrated 
      an elevated photodegradation rate for SMPs compared to the PMPs. Moreover, the 
      Differential Scanning Colorimetry (DSC) demonstrated an increasing percentage of 
      crystallinity in all MPs due to the photodegradation. The percent crystallinity 
      of HDPE pellets increased after photodegradation from 49.8 to 62.6 and it 
      increased from 17.2 to 38.9 for LDPE pellets respectively. The greater level of 
      increase in crystallinity for LDPE in comparison to HDPE upon photodegradation 
      was referred to as LDPE's greater amorphous content and branched structure. A 
      greater level of metal uptake was obtained for photodegraded LDPE pellets as 2526 
      mug/m(2) for Pb(II) and 2028 mug/m(2) for Zn(II) respectively.
CI  - Copyright (c) 2022 Elsevier Ltd. All rights reserved.
FAU - Herath, Amali
AU  - Herath A
AD  - Department of Civil Engineering, The University of Memphis, Memphis, TN, USA.
FAU - Salehi, Maryam
AU  - Salehi M
AD  - Department of Civil Engineering, The University of Memphis, Memphis, TN, USA. 
      Electronic address: msalehiesf@gmail.com.
LA  - eng
PT  - Journal Article
DEP - 20220615
PL  - England
TA  - Environ Pollut
JT  - Environmental pollution (Barking, Essex : 1987)
JID - 8804476
RN  - 0 (Metals, Heavy)
RN  - 0 (Microplastics)
RN  - 0 (Plastics)
RN  - 0 (Polymers)
RN  - 0 (Water Pollutants, Chemical)
RN  - 2P299V784P (Lead)
RN  - 9002-88-4 (Polyethylene)
SB  - IM
MH  - Lead
MH  - *Metals, Heavy/chemistry
MH  - Microplastics
MH  - Plastics/chemistry
MH  - Polyethylene/chemistry
MH  - Polymers
MH  - *Water Pollutants, Chemical/analysis
OTO - NOTNLM
OT  - Heavy metals
OT  - Microplastics
OT  - Photodegradation
OT  - Plastic pollution
OT  - Storm runoff
EDAT- 2022/06/19 06:00
MHDA- 2022/07/28 06:00
CRDT- 2022/06/18 19:36
PHST- 2022/04/08 00:00 [received]
PHST- 2022/05/25 00:00 [revised]
PHST- 2022/06/12 00:00 [accepted]
PHST- 2022/06/19 06:00 [pubmed]
PHST- 2022/07/28 06:00 [medline]
PHST- 2022/06/18 19:36 [entrez]
AID - S0269-7491(22)00842-9 [pii]
AID - 10.1016/j.envpol.2022.119628 [doi]
PST - ppublish
SO  - Environ Pollut. 2022 Sep 1;308:119628. doi: 10.1016/j.envpol.2022.119628. Epub 
      2022 Jun 15.