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SAN DIEGO - Marine life off the Los Angeles coast may still be impacted by the effects of a long-disused DDT dumping site, a report from UC San Diego's Scripps Institution of Oceanography and San Diego State University researchers found Monday.
According to their findings -- published Monday in the journal Environmental Science and Technology Letters -- deep-sea fish and sediments collected from near the dump site remain contaminated with numerous DDT-related chemicals. According to the authors, from 1948 until at least 1961, barges contracted by DDT-producer Montrose Chemical Corporation would motor from the Port of Los Angeles out toward Catalina and pump manufacturing waste laden with sulfuric acid and up to 2% pure DDT directly into the Pacific Ocean. This practice was legal until 1972 but largely overshadowed by Montrose's other waste disposal practice -- pumping a more dilute acidic slurry that also contained DDT through L.A.
Since then, Aluwihare, study co-author Eunha Hoh of SDSU, and other collaborators began a series of research efforts. They seek to answer two main questions:-- Is there a chemical fingerprint unique to what was dumped there in comparison to what was piped off Palos Verdes? "None of these fish species are known to feed in the sediment of the seafloor," said Anela Choy, biological oceanographer at Scripps and co-author of the study."There must be another mechanism that is exposing them to these contaminants. One possibility is that there are physical or biological processes resuspending sediments around Dumpsite 2 and allowing these contaminants to enter deeper water food webs.
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