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Profiling Microplastic Pollution in Surface Water Bodies in the Most Urbanized City of Sri Lanka and Its Suburbs to Understand the Underlying Factors

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Abstract

This study investigated the microplastic pollution of surface waters in and around the most populated and urbanized city in Sri Lanka from 2019 to 2022. The sampling regime was designed to cover the rainfall-driven hydrology and varying levels of urbanization approximated by the built area fraction. Mass and particle concentrations of microplastics ranged from undetected to 0.01 g/L (average ± standard deviation: 0.00464 ± 0.00528 g/L) and from 2 to 36 particles/L (5.3 ± 6.9), respectively. The highest microplastic pollution was observed in the lake; however, in many cases it was without a statistically significant (P < 0.05) difference with canals. Concentrations in the dry state (i.e., at least 30 days after no rainfall) were about 1.5 times more than the wet state (i.e., at least 50 mm/day rainfall for 10 days) in the lake and in the semi-urban canal, but again, the differences were not significant; however, in urban canals, the concentrations were similar in both states. Over 80% of the microplastics were fibre and fragments. Mass concentrations of microplastics showed moderately positive (Pearson’s r > 0.6) correlations with the built area fraction of the contributing catchment in both states but was significant (P < 0.1) only in the dry state. In the case of particle concentrations, none showed even a weak correlation. The independence of microplastic content against built area fraction and rainfall, as well as twice the concentrations found in point source inputs against the surface waters, gave the following insights. Microplastic content in our study area was governed mostly by the modified catchment hydrology spearheaded by stormwater drainages (some cases trans-catchment) and diffusion factors such as non-residential population.

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Data Availability

The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Funding

This research was supported by a research grant by Faculty of Graduate Studies and Research, Sri Lanka Institute of Information Technology FGSR/RG/FE/2022/03.

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Authors and Affiliations

  1. Department of Civil Engineering, Sri Lanka Institute of Information Technology, New Kandy Road, Malabe, 10115, Sri Lanka

    R. M. L. S. Bandara, M. D. D. Perera & Pattiyage I. A. Gomes

  2. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, People’s Republic of China

    Xu-Feng Yan

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Bandara, R.M.L.S., Perera, M.D.D., Gomes, P.I.A. et al. Profiling Microplastic Pollution in Surface Water Bodies in the Most Urbanized City of Sri Lanka and Its Suburbs to Understand the Underlying Factors. Water Air Soil Pollut 234, 157 (2023). https://doi.org/10.1007/s11270-023-06168-0

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