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Assessment of Microplastic Pollution Load Index in Gisik Cemandi River Estuary
Summary
Researchers found tiny plastic fragments (microplastics) in every single water and sediment sample from an Indonesian river estuary, mostly tiny fibers likely from clothing, fishing nets, and household waste. This matters because these waterways often connect to fish and seafood that people eat, meaning the plastic pollution could work its way into our food supply — and the pollution levels here were high enough to be flagged as a real environmental risk requiring cleanup action.
Plastic waste pollution has become a serious environmental issue in Indonesia, particularly in aquatic ecosystems where plastics degrade into microplastics. This study aims to identify the abundance, characteristics, and ecological risk of microplastics in the water and sediment of the Gisik Cemandi River Estuary, Sidoarjo. Sampling was conducted at six stations during the morning and afternoon, covering surface and mid-depth layers for water, and sediment. Microplastics were extracted using the NOAA method and observed under a stereo microscope. The results showed that microplastics were present in all samples. The abundance in water reached 339 particles/L in the morning and 356 particles/L in the afternoon. The mid-depth layer contained a higher concentration of microplastics (209 particles/L) compared to the surface layer (153 particles/L). Fibers were the most dominant shape (90-92%), while black was the most frequent color (57-60%), and the dominant size ranged from 0.1 to 0.5 mm. The ecological risk assessment using the Pollution Load Index (PLI) indicated values ranging from 11.40 to 18.03 in the morning (Moderate Risk) and up to 28.98 in the afternoon (High Risk), with Station D consistently showing the highest risk levels. These findings highlight the significant influence of domestic and fishing activities on microplastic pollution in the estuary, necessitating urgent mitigation strategies.