Cited by 166Microplastics and Plastic PollutionEnvironmental Toxicology and EcotoxicologyPharmaceutical and Antibiotic Environmental Impacts

Characterizing microplastic hazards: which concentration metrics and particle characteristics are most informative for understanding toxicity in aquatic organisms?

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Thornton Hampton, Leah M., Brander, Susanne M., Coffin, Scott, Cole, Matthew, Hermabessiere, Ludovic, Koelmans, Albert A., Rochman, Chelsea M.·2022·Microplastics and Nanoplastics

Abstract

There is definitive evidence that microplastics, defined as plastic particles less than 5 mm in size, are ubiquitous in the environment and can cause harm to aquatic organisms. These findings have prompted legislators and environmental regulators to seek out strategies for managing risk. However, microplastics are also an incredibly diverse contaminant suite, comprising a complex mixture of physical and chemical characteristics (e.g., sizes, morphologies, polymer types, chemical additives, sorbed chemicals, and impurities), making it challenging to identify which particle characteristics might influence the associated hazards to aquatic life. In addition, there is a lack of consensus on how microplastic concentrations should be reported. This not only makes it difficult to compare concentrations across studies, but it also begs the question as to which concentration metric may be most informative for hazard characterization. Thus, an international panel of experts was convened to identify 1) which concentration metrics (e.g., mass or count per unit of volume or mass) are most informative for the development of health-based thresholds and risk assessment and 2) which microplastic characteristics best inform toxicological concerns. Based on existing knowledge, it is recommended that microplastic concentrations in toxicity tests are calculated from both mass and count at minimum, though ideally researchers should report additional metrics, such as volume and surface area, which may be more informative for specific toxicity mechanisms. Regarding particle characteristics, there is sufficient evidence to conclude that particle size is a critical determinant of toxicological outcomes, particularly for the mechanisms of food dilution and tissue translocation .

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Crossref · 10.1186/s43591-022-00040-4

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  • Exposure in humans includes a diversity of particles present in environmental samples, including numerous polymer types, morphologies, additives, and sizes.

    “Exposure in humans includes a diversity of particles present in environmental samples (e.g., numerous polymer types, morphologies, additives, sizes).32,33”

    From Microplastics and Anthropogenic Particles in Recreationally Caught Freshwater Fish from an Urbanized Region of the North American Great Lakes (2024) · cites this paper as [33]

    The Introduction (page unavailable) describes microplastics as a diverse group of materials with features including size, morphology, polymer type, and chemical additives, and discusses environmental monitoring data. It does not establish that human exposure includes that diversity of particles, so the human-exposure portion is unsupported. (LLM, conf=0.84)

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  • Exposure in humans includes a diversity of particles present in environmental samples, including numerous polymer types, morphologies, additives, and sizes.

    “Exposure in humans includes a diversity of particles present in environmental samples (e.g., numerous polymer types, morphologies, additives, sizes).32,33”

    From Microplastics and Anthropogenic Particles in Recreationally Caught Freshwater Fish from an Urbanized Region of the North American Great Lakes (2024) · cites this paper as [32]

    The Introduction (page not available) lists size, morphology, polymer type, and chemical additives as microplastic features, and the ‘Microplastic characteristics of toxicological concern’ section describes their physical and chemical diversity. The paper discusses environmental microplastics and aquatic-organism toxicity, but these passages do not establish that human exposure includes that diversity of particles. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • The diversity of microplastics in the environment poses a challenge for establishing a risk assessment framework.

    “The diversity of microplastics in the environment poses a challenge for establishing a risk assessment framework.33”

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Authors
Thornton Hampton, L. M., Brander, S. M., Coffin, S., Cole, M., Hermabessiere, L., Koelmans, A. A., & Rochman, C. M.
Affiliations
  • Oregon State University (US)
  • State of California (US)
  • Plymouth Marine Laboratory (GB)
  • Wageningen University & Research (NL)
  • University of Toronto (CA)
Venue
Microplastics and Nanoplastics
Published
2022-08-06
Volume
2
Issue
1
ISSN
2662-4966 (ISSN-L)
OpenAlex
W4290091001
Cited by
166
References
92
Citations by year
2026: 42 · 2025: 49 · 2024: 44 · 2023: 27 · 2022: 4
FWCI
7.36
Type
journal article
Language
en
Open access
Locations
  • Microplastics and Nanoplastics (publishedVersion, cc-by)
  • Socio-Environmental Systems Modeling (acceptedVersion, cc-by)
  • Marine Biological Association (acceptedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Data Archiving and Networked Services (DANS) (submittedVersion, cc-by)
Funders
  • California State Water Resources Control Board
  • Natural Environment Research Council (NE/V007351/1)
Topics
  • Physical Sciences › Environmental Science › Pollution › Microplastics and Plastic Pollution
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Environmental Toxicology and Ecotoxicology
  • Physical Sciences › Environmental Science › Pollution › Pharmaceutical and Antibiotic Environmental Impacts
Keywords
microplastics, particle size, particle properties, aquatic toxicity, hazard characterization, mass concentration, surface area, risk assessment, expert panel consensus

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