Lake Sihwa Sediment Study Reveals Decades of Industrial Rubber Contamination and Rising Risks to Aquatic Ecosystems

Study tracks 60 years of rubber-related chemical buildup in South Korean lake sediments, identifying significant risks to local fish and aquatic life.

By: AXL Media

Published: Apr 25, 2026, 6:38 AM EDT

Source: Information for this report was sourced from EurekAlert!

The Historical Archive of Synthetic Rubber Contamination

A comprehensive environmental investigation has uncovered a persistent record of chemical contamination tied to the global surge in synthetic rubber production. As global output reached 16.1 million tons in 2023, the environmental footprint of these products has become deeply embedded in aquatic landscapes. In South Korea, where vehicle registrations have exploded by more than 500-fold since the mid-1960s, researchers have utilized Lake Sihwa as a primary site to track the long-term accumulation of rubber-related toxins. The study, published in Environmental Chemistry and Ecotoxicology, highlights how modern transportation demands have left a permanent chemical signature in the region's sediment layers.

Mapping the Spatial Distribution of Toxic Runoff

The research team, led by experts from the Wadsworth Center and the New York State Department of Health, identified a clear spatial pattern regarding where these chemicals settle. Analysis shows that the highest concentrations of the 17 identified tire-related chemicals are found in inland creeks that feed into Lake Sihwa. According to corresponding author Kurunthachalam Kannan, concentrations are significantly higher inside the lake compared to offshore sites, with a dramatic spike observed in downstream locations relative to upstream areas. This gradient strongly suggests that the pollution is driven by localized industrial operations and unfiltered urban runoff.

Identifying Risks to Regional Aquatic Organisms

The chemical additives used to enhance tire performance, while beneficial for road safety and durability, pose a severe threat to marine life when they leach into the water table. A preliminary risk analysis conducted during the study flagged several compounds that may pose an immediate danger to aquatic organisms, particularly within the confined environments of inland creeks. The researchers utilized a screening Risk Quotient to identify locations where chemical levels exceeded safe ecological thresholds, noting that some specific rubber chemicals have already drawn global scrutiny for their high levels of toxicity to various fish species.