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Microplastics vs. sediments: What we know and what we do not know
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This review examines parallels between microplastic research and the established field of sedimentology, identifying seven research objectives -- including particle description, environmental interactions, vertical distribution, resuspension behavior, biota-influenced transport, sampling methods, and toxicity -- where sediment science knowledge can accelerate progress in microplastics research.
Microplastics research in the aquatic environment is highly interdisciplinary, but rarely uses knowledge on comparable topics in other disciplines. In particular, extensive research in sedimentology can enrich and perhaps accelerate microplastics research. First, however, it must be examined to what extent microplastics are comparable to clastic sediments. For this purpose, we have written an extensive multidisciplinary review paper (DOI: 10.1016/j.earscirev.2022.104021) that compares the aspects of particle properties, transport processes, sampling techniques and ecotoxicology. Based on the literature analysis, we identify seven research objectives that are essential for a better understanding of microplastics and that can be addressed by learning from research on mineral sediments. These objectives address (1) the description of microplastic particles, (2) the interaction of microplastics with environmental substances, (3) the vertical distribution of microplastics, (4) the resuspension and deposition behaviour of microplastics, (5) the influence of biota on microplastic transport, (6) sampling methods, and (7) the toxicity of microplastics. In doing so, we highlight areas where we can draw on knowledge and techniques from sediment research - and areas where we need new, microplastics-specific knowledge - and identify recommendations for future, interdisciplinary microplastics research. Also see: https://micro2022.sciencesconf.org/426007/document
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Researchers drew on decades of sediment science to propose seven research priorities for improving microplastic studies, including better particle description, transport modeling, and toxicity assessment methods adapted from geology. This cross-disciplinary approach could accelerate understanding of how microplastics move through rivers, oceans, and ecosystems and how they harm living organisms.
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Three Lessons for the Microplastics Voyage
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This commentary reflects on lessons learned from two decades of microplastics research, arguing that the field needs to better connect environmental concentrations to biological effects, and to prioritize the most policy-relevant questions. The author calls for more coordination and strategic focus in microplastic science.
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