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Microplastics in tropical Malaysian rivers: a review on spatial abundance, analytical methods, and ecological risk assessment
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Researchers synthesized microplastic data from Malaysian rivers and found concentrations spanning four orders of magnitude, with fiber dominance in rural basins and fragment prevalence near industrial zones, proposing that monsoon pulses act as episodic flushing events that mobilize accumulated plastic from terrestrial sinks toward coastal waters.
Riverine systems in Southeast Asia are vital pathways for microplastic (MP) flux, but a unified understanding of their spatial patterns, land-use influences, and transport dynamics remains limited. As a primary contributor to global riverine plastic emissions, Malaysia serves as a critical model for understanding microplastic dynamics in tropical monsoonal climates. Microplastics are emerging contaminants that can be harmful to tropical ecosystems. This systematic review synthesizes existing data on MP abundance, morphology, and transport within Malaysian river basins, providing a comprehensive analysis of how local land use and tropical climate drivers control the environmental fate of MPs and evaluating the current state of MP pollution and the evolution of analytical methods. Our findings reveal a broad concentration gradient, ranging from 4.2 × 10 items in the waters of the Cherating River to a peak of 2012 items/L in the industrial reaches of the Langat River. Morphological characterization shows a distinct land-use signature, fiber dominance (> 90%) in the rural domestic Kelantan basin, contrasting with fragment-heavy profiles in the urban industrial Langat and Melaka basins. Methodologically, the field has transitioned from visual microscopy to high-resolution spectroscopic validation (µFTIR and Py-GC/MS), significantly lowering detection limits to 1-10 µm. A conceptual model of tropical transport dynamics is proposed, highlighting the role of monsoonal flushing in mobilizing plastic pulses from terrestrial sinks to coastal shorelines. Comparing Malaysian basins with other high-pressure systems in tropical countries reveals that Malaysia is a globally significant contributor to microplastics. By situating these findings within the global context, this review provides an important framework for understanding microplastic transport in rapidly urbanizing tropical regions and offers essential data for international marine conservation and global climate resilience strategies.
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A multidimensional approach for microplastics monitoring in two major tropical river basins, Malaysia
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Researchers conducted a multidimensional assessment of microplastic distribution in surface waters of two major Malaysian river basins, providing much-needed field data on microplastic emissions from Asian rivers known to be major contributors to ocean pollution.
Spatio-Temporal Variation of Microplastic Along a Rural to Urban Transition in a Tropical River in Selangor Malaysia
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Researchers surveyed microplastic contamination along an urban-to-rural gradient in Malaysia's Klang River and found widespread pollution across all six sampling stations, with HDPE, LDPE, polypropylene, and nylon fibers and fragments dominating — patterns pointing to urban runoff and industrial discharge as primary sources entering the Malacca Strait.
Microplastic concentrations in river water and bed sediments in a tropical river: implications for water quality monitoring
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Researchers found that microplastic concentrations in a tropical Malaysian river averaged 3.12 particles/L in water and 6,027 particles/m² in bed sediments, with high within-site variability and poor correlation between water and sediment contamination levels, complicating monitoring strategies.
Abundance and Distribution of Microplastics in the Water and Riverbank Sediment in Malaysia – A Review
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Microplastic abundance and distribution were surveyed in the water column and riverbank sediments of a Malaysian river. Results showed microplastics throughout the river system, with fiber shapes dominating in water and fragments more common in sediments, reflecting contributions from domestic wastewater and plastic litter.
Spatio-temporal variation of microplastic along a rural to urban transition in a tropical river
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Researchers tracked microplastic pollution across rural-to-urban gradients along the Langat River in Malaysia over 12 months. They found that microplastic concentrations increased significantly from forested headwaters toward heavily urbanized and industrialized areas downstream. The study provides important baseline data on how rapid development and limited environmental regulation in tropical countries contribute to river microplastic pollution.
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