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Accumulation and distribution of Hg and 210Pb in superficial sediments from a coastal lagoon in the SE Gulf of California associated with urban-industrial and port activities |
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| Authors: | J R Raygoza-Viera A C Ruiz-Fernández J Ruelas-Inzunza C Alonso-Hernández L H Pérez-Bernal F Páez-Osuna |
| Institution: | 1. Posgrado en Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México (UNAM), Mexico City, Mexico 2. Instituto Tecnológico de Mazatlán, Mazatlán, Sinaloa, Mexico 3. Mazatlan Academic Unit, Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México (UNAM), AV. Joel Montes C. S/N, C.P. 82040, Mazatlán, Sinaloa, Mexico 4. Centro de Estudios Ambientales de Cienfuegos, Cienfuegos, Cuba 5. Member of El Colegio de Sinaloa, Culiacán, Sinaloa, Mexico |
| Abstract: | The Estero de Urías Lagoon (EUL) is an inner shelf barrier coastal lagoon, located in the Mexican Pacific Coast (SE Gulf of California). It is surrounded by Mazatlán City, one of the most important international tourist areas of Mexico. To provide a comprehensive reassessment of the concentration levels and spatial variability of Hg and 210Pb in the EUL, 40 surface sediment samples were analyzed for several geochemical variables (e.g. grain size distribution, organic matter and reference element concentrations) that could explain the observed variability of Hg and 210Pb. The Hg concentrations ranged from 23 to 214 ng g?1, whereas 210Pb activities varied from 20 to 56 Bq kg?1. No defined distribution pattern was observed for Hg and 210Pb concentrations in the lagoon and no evidence of a common atmospheric delivery route was observed. The sediments from EUL were found contaminated by Hg, and according to international guidelines 48 % of the sampling sites have concentrations that could be harmful to biota. |
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