California

DECADES-OLD BARRELS OF INDUSTRIAL WASTE STILL IMPACTING OCEAN FLOOR OFF LA

In 2020, haunting images of corroded metal barrels in the deep ocean off Los Angeles leapt into the public consciousness. Initially linked to the toxic pesticide DDT, some barrels were encircled by ghostly halos in the sediment. It was unclear whether the barrels contained DDT waste, leaving the barrels’ contents and the eerie halos unexplained.

Now, new research from UC San Diego's Scripps Institution of Oceanography reveals that the barrels with halos contained caustic alkaline waste, which created the halos as it leaked out. Though the study’s findings can’t identify which specific chemicals were present in the barrels, DDT manufacturing did produce alkaline as well as acidic waste. Other major industries in the region such as oil refining also generated significant alkaline waste.

“One of the main waste streams from DDT production was acid and they didn’t put that into barrels,” said Johanna Gutleben, a Scripps postdoctoral scholar and the study’s first author. “It makes you wonder: What was worse than DDT acid waste to deserve being put into barrels?”

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https://scripps.ucsd.edu/news/decades-old-barrels-industrial-waste-still-impacting-ocean-floor-la