Scientists release 62,000 liters of sodium hydroxide into Gulf of Maine

August 31, 2026 at 08:13 PM2 min

This digest was compiled by AI from multiple sources — links to the originals are below.

Researchers released 62,000 liters of sodium hydroxide solution into the Gulf of Maine's Wilkinson Basin over six hours. The experiment, conducted under EPA permit, aimed to test whether increasing seawater alkalinity boosts carbon dioxide uptake. Initial results presented in Glasgow showed increased CO2 absorption capacity and no significant harm to marine organisms.

Key Facts

The experiment released 62,000 liters of sodium hydroxide solution into the Wilkinson Basin, about 61 kilometers off Cape Cod, Massachusetts.
The release lasted six hours and was conducted under a permit from the U.S. Environmental Protection Agency.
Initial results were presented at the Ocean Sciences Meeting in Glasgow, Scotland.
Measurements indicated increased carbon dioxide uptake capacity in the treated seawater.
No significant negative changes were detected in bacteria, phytoplankton, zooplankton, fish larvae, or lobster larvae.

The Experiment

The LOC-NESS project released approximately 50% sodium hydroxide solution into the Wilkinson Basin in the Gulf of Maine. The release occurred about 61 kilometers off Cape Cod, Massachusetts, and lasted six hours. The U.S. Environmental Protection Agency issued a permit for the experiment because sodium hydroxide is a strong alkali. A bright tracer dye called rhodamine was added to track the treated water mass using ships, satellites, underwater vehicles, and other measurement systems.

Initial Results

Measurements showed signs that the treated seawater's capacity to absorb carbon dioxide increased. The pH level rose during the experiment and returned to baseline values as the water mass dispersed. Samples from inside and outside the experiment area were compared for bacteria, phytoplankton, zooplankton, fish larvae, and lobster larvae. Initial examinations found no significant negative changes in the abundance or tracked health indicators of these organisms.

Limitations and Future Questions

The results do not mean the method is completely safe at large scale. Larger organisms such as adult fish and marine mammals were not directly studied. Researchers emphasize that the ecosystem effects of much larger areas or repeated applications are still unknown. Meaningful climate impact would require much larger quantities of alkaline material, raising questions about production, transport, application costs, and environmental effects. The study is currently considered a controlled field experiment, not a ready solution to the climate crisis.