Toxic mercury rides rivers into the sea

Nature
Satellite image of Ganges Delta plain, Bangladesh

The Ganges River is one of the biggest contributors of mercury into coastal oceans. Credit: ESA/Shutterstock

Geochemistry

Toxic mercury rides rivers into the sea

Research suggests that rivers are a bigger source of mercury in coastal waters than is the atmosphere — a finding that contradicts some global models.

Rivers pour one million kilograms of the toxic element mercury each year into the oceans, where it can poison fishes and the people who eat them.

Mercury comes from both natural sources, such as volcanoes, and non-natural sources, such as power plants. Once in the atmosphere, it can travel long distances before settling onto land and sea. Some global models assume that all mercury entering the oceans arrives from the atmosphere.

Xuejun Wang at Peking University in Beijing, Peter Raymond at Yale University in New Haven, Connecticut, and their colleagues combined data on mercury in rivers with models of how much water and sediment are carried by rivers to the sea. The scientists estimate that rivers add three times as much mercury to coastal oceans as atmospheric deposition does. Large rivers, such as the Amazon and the Ganges, are the biggest contributors.

Although the new estimate is lower than one previous estimate, it is higher than others, underscoring that rivers are an important and often underestimated contributor to the planet’s mercury budget.

Products You May Like

Articles You May Like

New Master Roadmap Guides Industries To Invest in Low-Cost, Low-Energy Ways To Treat Salt Water & Recycle Wastewater
Hurricane Ida forces Louisiana researchers to rethink their future
Five books from the Alnif Crater travelling library
Commercial spaceflight industry sees Inspiration4 as a pathfinder but not a model
How COVID is derailing the fight against HIV, TB and malaria

Leave a Reply

Your email address will not be published. Required fields are marked *