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Levels of chlorinated hydrocarbons and trace metals in bivalves and nearshore sediments from the Dominican Republic |
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| Authors: | Luciano Sbriz Margarita R Aquino Natividad M Alberto de rodriguez Scott W Fowler and Jose L Sericano |
| Institution: | a Comisión Nacional de Asuntos Nucleares (CONAN), Calle Coronel Fernandez Dominguez 30-A, Apartado Postal 30333, Ens. La Fe, Santo Domingo, D.N., República Dominicana b Departamento de Química, Universidad Nacional Pedro Henriquez Urena, Santo Domingo, D.N., República Dominicana c Instituto de Física, Universidad Autónoma de Santo Domingo, Santo Domingo, D.N., República Dominicana d IAEA Marine Environment Laboratory, 19 av. des Castelans, B.P. 800, MC-98012, Monaco Cedex, Monaco e Geochemical and Environmental Research Group, Texas A&M University, 833 Graham Rd, College Station, TX 77845, USA |
| Abstract: | Bivalves (Crassostrea rizhophorae, Isognomon alatus, Codakia orbicularis Linné, and Tellina fausta) and sediment samples collected from 12 locations along the Dominican Republic coastline were used to assess the degree of nearshore contamination by selected chlorinated hydrocarbons and heavy metals. Concentrations of total chlordanes, DDTs and PCBs ranged from 0.51 to 7.47 ng/g, < MDL to 30.9 ng/g and 11.3 to 82.3 ng/g, and from < MDL to 1.73 ng/g, 0.21 to 12.5 ng/g and 0.46 to 41.9 ng/g in bivalves and surface sediments, respectively. The concentration ranges of predominantly anthropogenic Cu, Pb and Zn were 3.08–866 μg/g, 0.08–1.46 μg/g and 22.9–4380 μg/g in bivalve soft parts and 1.01–111 mg/g, 0.420–134 μg/g and 1.96–277 μg/g in surface sediments, respectively. Mercury concentrations ranged from 0.290 to 7.02 μg/g and from 0.096 to 0.565 μg/g in both matrices. The relatively high Hg concentrations found in bivalves from two stations in Bahia Samana, near to a known source of past Hg contamination in the sediments, require a more in-depth survey of the area. In general the concentrations of selected chlorinated hydrocarbons and trace metals, compared with those reported for the same matrices in the Caribbean and west Atlantic coastal areas, show at present the existence of only very localized contamination problems in the Dominican Republic. |
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