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An Open-Source Computer Vision-Based Method for Microplastic Settling Velocity Calculation
Summary
Researchers developed an open-source computer vision method to measure microplastic settling velocities from video recordings, enabling low-cost quantification of how particles of different sizes and densities sink in water columns with implications for predicting MP fate in aquatic environments.
Microplastics (particles ≤ 5 mm) are ubiquitous and persistent, posing threats to ecosystems and human health. Thus, the development of technologies for evaluating their dynamics is crucial. Settling velocity is a critical parameter for predicting the fate of microplastics in aquatic environments. Current methods for computing this metric are highly subjective and lack a standard. The goal of this research is to develop an objective, automated technique employing the technological advances in computer vision. In the laboratory, a camera recorded the trajectories of microplastics as they sank through a water column. The size and settling velocity of each microplastic were calculated using a YOLOv12n-based object detection model. The system was tested with three classes of microplastics and three types of water. Ground truth settling times, recorded manually with a stopwatch, allowed for quantification of the system’s accuracy. When comparing the velocities calculated using the computer vision system to the stopwatch ground truth, the average error across all water types was 5.97% for the 3 mm microplastics, 7.14% for the 4 mm microplastics, and 6.15% for the 5 mm microplastics. This new method will enable the research community to predict microplastic distribution and transport patterns and implement more timely strategies for mitigating pollution.
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