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Dynamic Complexity of a Discrete-time Prey-Predator Model with Mixed Functional Responses
Summary
Researchers assessed atmospheric microplastic deposition at fifteen major traffic intersections across greater Dhaka city from July to August 2022, calculating deposition rates ranging from 1.11x10^6 to 5.78x10^6 MPs/m2/day and characterising particle types using Fourier Transform Infrared spectroscopy. The study documented fluorescence activity in a subset of microplastic particles and identified traffic infrastructure as a major source of airborne microplastic contamination in one of the world's most densely populated urban environments.
Plastic particles less than 5 mm in size, known as microplastics, can infiltrate the environment from a variety of sources. This study aimed to assess the presence of microplastics (MPs) in the atmosphere at fifteen major traffic intersections in the greater Dhaka city from July to August 2022.The deposition rate (DP) of MPs was calculated and the observed DPs value ranged from 1.11×106 MPs/m2/day to 5.78×106 MPs/m2/day with a portion of microplastics exhibiting fluorescence activity. Fourier Transform Infrared (FTIR) spectroscopy was used to analyze the functional groups present in microplastics. The identified polymer compositions of MPs were polyethylene (PE), Nylon-6 and natural polymers (cellulose and rubber). The current study highlights the data and knowledge gaps on the atmospheric transport of microplastics and their impact to the deterioration of overall urban air quality. Dhaka Univ. J. Sci. 72(2): 15-24, 2024 (July)