Partitioning of heavy metals in sediments and microplastics from stormwater runoff

Herath, Amali; Datta, Debanshee; Bonyadinejad, Gholamreza; Salehi, Maryam

doi:10.1016/j.chemosphere.2023.138844

Cited by 12 publications

(2 citation statements)

References 45 publications

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“…In this study, low-density polyethylene (LDPE) was used to study fragmentation process because it is the most widespread used plastic type for mulch, greenhouse covering materials, and irrigation pipes. [49] The LDPE pellets (d p = 5 mm) and film (t = 101 µm) were purchased from PS Mechanical forces Mechanical forces like repeated dragging over sand and stones by waves can generate nanoplastics (<700 nm) in 5 min along coastlines. [42] PP and PE debris Plastic type Plastic embrittles in sea but degradation increased on land due to physical processes like saltation and dragging.…”

Section: Methodsmentioning

confidence: 99%

Insights into the mechanism of plastics’ fragmentation under abrasive mechanical forces: An implication for agricultural soil health

Bhattacharjee,

Jazaei,

Salehi

2023

CLEAN Soil Air Water

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The application of agricultural plastic products such as mulch, greenhouse covers, and silage films is increasing due to their economic benefits in providing an early and better‐quality harvest. However, mechanical abrasion of these plastic materials by soil particles could result in generation of microplastic (MP) pollutants that could harm soil organisms and impact food safety. This study aims to better understand the physicochemical mechanisms resulting in the fragmentation of low‐density polyethylene (LDPE). Herein, we used pellets and films to study the impacts of abrasive wear forces on their surface morphology variations and fragmentation behavior. An innovative laboratory approach was developed to abrade the plastic surface under controlled normal loadings and abrasion durations. The investigation of the plastics’ surface morphology variations due to the abrasion process revealed microcutting as the dominant process at low normal force (4 N). However, a combination of microploughing and microcutting occurred for new LDPE films by increasing the normal force to 8 N. Despite the significant surface morphology variations of the new LDPE film due to the abrasion process; the water contact angle did not alter. Furthermore, the fragmentation behavior of photodegraded LDPE pellets and films was compared to the new plastics. The extent of MPs (3 µm < dp < 162 µm) generation due to fragmentation was studied using fluorescence microscopy imaging. The localized stress and strains at the contact sites of plastic and sand particles resulted in abrasion of the plastic surface. According to the results, the normal loadings and duration of abrasion played a significant role in the degree of fragmentation of plastics. Increasing the normal loading applied during the abrasion process from 2 to 8 N linearly increased the number of generated plastic fragments by more than five times for pellets and more than three times for film. Photodegradation significantly enhanced the extent of MPs fragmentation. Moreover, the limitations of this study and the implications for agricultural soil health were discussed.

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Section: Methodsmentioning

confidence: 99%

Insights into the mechanism of plastics’ fragmentation under abrasive mechanical forces: An implication for agricultural soil health

Bhattacharjee,

Jazaei,

Salehi

2023

CLEAN Soil Air Water

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“…In addition to their inherent toxicity, MPs can serve as sources, carriers, and accumulators of other contaminants. With their hydrophobicity, adsorption capacity, and increased surface area/decreased particle size, aged MPs become vectors for attracting and transporting a wide range of organic and inorganic pollutants (Jahnke et al 2017;Wright and Kelly 2017;Yu et al 2019;Ren et al 2021;Herath et al 2023) leading to modification of the surface properties and of the colloidal behavior of MPs (Wang et al 2022). These pollutants include heavy metals (Godoy et al 2019;Li et al 2019;Selvam et al 2021), PCBs and PAHs (Velzeboer et al 2014;Joo et al 2021), PFASs (Bere et al 2023) dissolved organic matter (Sun et al 2023), bisphenols (Wu et al 2019), antibiotics (Li et al 2018), pesticides (Wang et al 2020;Li et al 2021;Mo et al 2021), pharmaceuticals (Nugnes et al 2022), radionuclides (Ioannidis et al 2022), bacteria/pathogens (Redman et al 2004;Woo et al 2008;Zettler et al 2013;Harrison et al 2014;McCormick et al 2014;Amaral-Zettler et al 2020;Kruglova et al 2022), and even antibiotic resistance genes (Yan et al 2020).…”

Section: Enhanced Transport Of Co-contaminantsmentioning

confidence: 99%

The Plastiverse Extends to Hydrogeologic Systems: Microplastics Are an Important Emerging Groundwater Contaminant Class

Divine,

Killingstad,

Mortensen

et al. 2024

Groundwater Monitoring Rem

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A simple methodology for in situ study of microplastics’ aggregation

Bonyadinejad,

Salehi

2024

CLEAN Soil Air Water

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Due to the critical impacts of microplastic (MP) aggregation on their fate, mobility, and bioavailability, this study developed a simple approach to examine their aggregation under varying water chemistry and MPs’ surface aging conditions. An accelerated photodegradation experiment was conducted for 6 weeks. The water chemistry conditions varied by altering pH, using natural organic matter (NOM), and conducting experiments in ultrapure water and synthetic stormwater. The surface chemistry analysis of photodegraded MPs revealed the formation of carbonyl and vinyl functional groups. Zeta potential measurements revealed a more negative surface charge for photodegraded MPs compared to new MPs. The aggregation kinetics of MPs were studied by comparing the number of MP clusters formed over time after intense dispersion in water. The results showed that the presence of NOMs reduces the aggregation tendency of new low‐density polyethylene MPs due to enhanced steric hindrance and electrostatic repulsion. However, variations of pH and utilizing synthetic stormwater versus ultrapure water did not alter the aggregation kinetics of new MPs. The aggregation behavior of photodegraded MPs was significantly different from new MPs. A greater tendency for aggregation of photodegraded MPs was found in the stormwater compared to the ultrapure water. This study contributes to a better understanding of the transport and fate of MPs within the aqueous environment and their subsequent environmental risks.

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Partitioning of heavy metals in sediments and microplastics from stormwater runoff

Cited by 12 publications

References 45 publications

Insights into the mechanism of plastics’ fragmentation under abrasive mechanical forces: An implication for agricultural soil health

Insights into the mechanism of plastics’ fragmentation under abrasive mechanical forces: An implication for agricultural soil health

The Plastiverse Extends to Hydrogeologic Systems: Microplastics Are an Important Emerging Groundwater Contaminant Class

A simple methodology for in situ study of microplastics’ aggregation

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