Overview
A one‑year scientific study has documented the lingering presence of plastic‑resin pellets, known as nurdles, along the coasts of Keralam and Tamil Nadu after the sinking of the MSC ELSA‑3. The vessel sank in May 2025, releasing about 640 containers of resin pellets, diesel, furnace oil and other hazardous material.
Key Developments
- Shoreline surveys recorded a peak density of 31,230 pellets per m² shortly after the spill, dropping >80 % within three months but re‑emerging at new hotspots by October 2025.
- By May 2026, pellets were still found buried up to 20 cm in beach sediments, indicating long‑term persistence.
- Physical and chemical ageing was observed using FTIR and scanning electron microscopy, showing surface oxidation and yellowing.
- Weathered pellets accumulated heavy metals, PAHs, petroleum hydrocarbons and PCBs, and became colonised by dense microbial communities termed the plastisphere.
- Microbial load on aged pellets rose to between 100,000–1,000,000 CFU per gram, especially during monsoon periods.
- Fish ingestion was recorded in 1.08 % (26 of 2,413) of sampled fish, with weathered, contaminant‑laden pellets causing oxidative stress and tissue damage.
Important Facts
The study was commissioned by the TNPCB and carried out by the SDMRI. Findings were published in the peer‑reviewed journal Marine Pollution Bulletin on 15 September 2026.
Key observations include:
- Rapid initial decline of surface pellets but formation of buried reservoirs.
- Progressive chemical oxidation detectable by FTIR, indicating ageing of polymer chains.
- Adsorption of persistent organic pollutants (POPs) onto pellet surfaces.
- Development of a dense plastisphere that can act as a vector for pathogenic bacteria.
- Biological uptake by marine fish, leading to physiological stress.
Exam Relevance
This case study touches upon several UPSC syllabus points: marine pollution, micro‑plastic pathways, inter‑state coordination in environmental emergencies, and the role of scientific monitoring agencies. Understanding the transformation of microplastics and their interaction with marine biota is essential for answering GS4 questions on marine ecosystems and pollution control.
Way Forward
Experts recommend:
- Long‑term monitoring of buried pellet reservoirs, especially after monsoon‑induced erosion.
- Development of rapid response protocols for future maritime spills, involving both central and state pollution boards.
- Research into biodegradable alternatives for resin pellets to reduce future micro‑plastic load.
- Public awareness campaigns in coastal communities about the health risks of plastic ingestion.
Continued scientific assessment will help shape policy measures aimed at mitigating marine plastic pollution and protecting coastal livelihoods.