Deposition of DDE and Polychlorinated Biphenyls in Dated Sediments of the Santa Barbara Basin

Science  14 Jun 1974:
Vol. 184, Issue 4142, pp. 1197-1199
DOI: 10.1126/science.184.4142.1197


Analysis of dated oceanic sediments from the Santa Barbara Basin of the Southern California Bight has shown that deposition of polychlorinated biphenyls (PCB) began about 1945 and that DDE [1,1-dichloro-2-2-bis(p-chloro-phenyl)ethylene] first appeared in sediments deposited about 1952. Concentrations of both show a progressive increase through 1967; estimated deposition rates (in grams per square meter per year) in 1967 of DDE and PCB were 1.9 x 10-4 and 1.2 x 10-4, respectively.