Scientists Uncover How PFAS 'Forever Chemicals' Reach Remote Antarctica

PFAS: The 'Forever Chemicals' Spreading to Earth’s Most Remote Regions

Per- and polyfluoroalkyl substances (PFAS) are synthetic chemicals used in nonstick cookware, waterproof fabrics, and stain-resistant products since the 1950s. Known as 'forever chemicals' due to their resistance to breakdown, PFAS accumulate in the environment and living organisms. Despite Antarctica’s isolation, these pollutants have been detected even in its pristine snow and ice, far from human activity.

New Study Traces PFAS Contamination Across 1,200 Kilometers of Antarctica

A study published in Science Advances examined PFAS levels across a 1,200-kilometer transect, from Zhongshan Station in East Antarctica to Dome A, the continent’s highest point at 4,093 meters. Researchers collected 39 snow samples at 30-kilometer intervals, analyzing layers from coastal and inland sites to track pollution patterns over time.

Key Findings from the Research

• Coastal vs. Inland Differences: Snow from a 1-meter-deep pit near Prydz Bay (Zhongshan Station) showed PFAS traces at 5-centimeter intervals. At Dome A, a 3-meter-deep pit revealed PFAS deposition at 10-centimeter intervals, reflecting decades of global use.
• Historical Pollution Record: The Dome A snow pit preserved a timeline of PFAS production, linking global emissions to Antarctic contamination.
• Transport Mechanisms: PFAS reach Antarctica via two primary pathways: upper atmospheric transport and sea spray.

How PFAS Travel Thousands of Kilometers to Antarctica

PFAS pollution arrives in Antarctica through atmospheric and oceanic processes:

1. Upper Atmospheric Transport: Volatile PFAS precursors, such as fluorotelomer alcohols used in textiles and papers, break down in the atmosphere under sunlight and oxidants. The resulting PFAS are deposited via precipitation into snow and ice.
2. Sea Spray Aerosols: Coastal storms generate sea spray enriched with PFAS. When ocean bubbles burst, they release aerosols carrying these chemicals inland.

"For substances to get there, they have to be able to transport long distances. We know PFAS are very persistent, so that helps. By looking at the patterns of the PFAS contamination in the samples, it gives us clues as to how they’re transported."
— Ian Cousins, Chemist at Stockholm University and Study Co-Author

Why Antarctica’s PFAS Pollution Matters

The study highlights the global reach of PFAS, demonstrating how persistent pollutants can travel to even the most remote environments. Understanding these transport mechanisms is critical for assessing the long-term impact of PFAS on ecosystems and human health, particularly in regions with limited direct human activity.