Automated analysis of microplastics based on vibrational spectroscopy: are we measuring the same metrics?

Analytical and Bioanalytical Chemistry, Год журнала: 2022, Номер 414(11), С. 3359 - 3372

Опубликована: Фев. 15, 2022

Язык: Английский

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Spatial and temporal variations of microplastic concentrations in Portland's freshwater ecosystems

The Science of The Total Environment, Год журнала: 2022, Номер 833, С. 155143 - 155143

Опубликована: Апрель 9, 2022

While microplastics are a pollutant of growing concern in various environmental compartments, less is known regarding the sources and delivery pathways urban rivers. We investigated relationship between microplastic concentrations spatiotemporal factors (e.g., land use, arterial road length, water velocity, precipitation) two watersheds along an urban-rural gradient Portland metropolitan area. Samples were collected August, September, February analyzed for total count type. Nonparametric statistics used to evaluate potential relationships with explanatory variables, derived at both subwatershed near stream scales. In significantly higher than February. August also negatively correlated flow rate, suggesting that lower rates may have facilitated accumulation microplastics. Smaller size particles (< 100 μm) found more September February, while larger dominant other months. Microplastic positively related 24-h antecedent precipitation Negative correlations existed wet season agricultural lands level. The results indicate variables strongly influence presence abundance Portland's waterways subwatershed-scale variables. Fragments most commonly observed morphology, dominance gray polymer polyethylene. findings this study can inform management decisions waste identify hotspots pollution benefit from remediation.

Язык: Английский

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Detecting Micro- and Nanoplastics Released from Food Packaging: Challenges and Analytical Strategies

Polymers, Год журнала: 2022, Номер 14(6), С. 1238 - 1238

Опубликована: Март 18, 2022

Micro- and nanoplastic (pMP pNP, respectively) release is an emerging issue since these particles constitute a ubiquitous growing pollutant, which not only threatens the environment but may have potential consequences for human health. In particular, there concern about of secondary pMP pNP from degradation plastic consumer products. The phenomenon well-documented in relation to waste but, more recently, reports generated even during normal use food contact materials, such as water bottles, tea bags, containers, been published. So far, validated harmonized strategy tackle available. this study, we demonstrate that breakdown can occur polyethylene (PE) rice cooking bags ice-cube well nylon teabags. A multi-instrumental approach based on Raman microscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), particular attention importance sample preparation were applied evaluate chemical nature released material their morphology. addition, simple method Fourier transform infrared (FT-IR) proposed mass quantification, resulting 1.13 ± 0.07 mg 6 each teabag. However, temperature was shown strong impact morphology aggregation status posing scientists legislators challenging question: are they micro- or nanoplastics something else altogether?

Язык: Английский

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Atmospheric deposition of anthropogenic particles and microplastics in south-central Ontario, Canada

The Science of The Total Environment, Год журнала: 2022, Номер 835, С. 155426 - 155426

Опубликована: Апрель 23, 2022

Язык: Английский

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Linking human activity to spatial accumulation of microplastics along mangrove coasts

The Science of The Total Environment, Год журнала: 2022, Номер 825, С. 154014 - 154014

Опубликована: Фев. 19, 2022

Язык: Английский

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