Exploring microplastic distribution in Western North American snow.

Autor: Karapetrova A; Department of Environmental Science, University of California, Riverside, CA 92521, USA. Electronic address: akara032@ucr.edu., Cowger W; Department of Environmental Science, University of California, Riverside, CA 92521, USA; Moore Institute for Plastic Pollution Research, Long Beach, CA 90803, USA., Michell A; Airborne Snow Observatories, Inc., Mammoth Lakes, CA 93546, USA., Braun A; Department of Environmental Science, University of California, Riverside, CA 92521, USA., Bair E; Leidos, Inc., Reston, VA 20190, USA., Gray A; Department of Environmental Science, University of California, Riverside, CA 92521, USA., Gan J; Department of Environmental Science, University of California, Riverside, CA 92521, USA.
Jazyk: angličtina
Zdroj: Journal of hazardous materials [J Hazard Mater] 2024 Dec 05; Vol. 480, pp. 136126. Date of Electronic Publication: 2024 Oct 10.
DOI: 10.1016/j.jhazmat.2024.136126
Abstrakt: Microplastic (MP) transport in the atmosphere, one of the least studied environmental compartments because of the relatively small size of air-borne MPs and the challenges in identifying them, may be inferred from their occurrence in snowfall. In this study, 11 sites across western coastal North America were sampled and analyzed for MP presence in fresh snowfall, months-old summer surface snow, and stratified deposits in snow pits. MPs were detected and characterized using a method integrating linear array µ-Fourier Transform Spectroscopy (µFTIR) and batch spectral analysis with open-source platform Open Specy. Recovery rate analysis from sample filtration to data analysis was conducted, and analysis of field or laboratory blanks suggested negligible contamination (≤ 1 polyamide fragment per blank). Concentrations of MPs in the fresh snowfall of remote sites and those proximal to sources were 5.1-150.8 p/L and 104.5-325 p/L of snowmelt water, respectively. Summer surface snow that was several months old had MP concentrations ranging from 57.5-539 p/L of meltwater, and snow sampled at different depths within a snowpack had concentrations ranging from 35-914 p/L. Our results demonstrate a streamlined method that may be used for measuring MPs in remote or pristine environments, contributing to a better understanding of long-range MP transport.
Competing Interests: 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.
(Copyright © 2024 The Authors. Published by Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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