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Título : Variación espacial y temporal en los contenidos de mercurio, plomo, cromo y materia orgánica en sedimento del complejo de humedales de Ayapel, Córdoba, noroccidente colombiano
Otros títulos : Variations of seasonal and spatial Hg, Pb, Cr and organic matter contents in Ayapel Flood Plain Lake sediments, Córdoba, northwest Colombia
Autor : Rúa Cardona, Alex Fernando
Flórez Molina, María Teresa
Palacio Baena, Jaime Alberto
metadata.dc.subject.*: Variabilidad espacial
Materia orgánica
Mercurio
Plomo
Cromo
Humedales
Fecha de publicación : 2013
Editorial : Universidad de Antioquia, Facultad de Ingeniería
Citación : A. F. Rúa, M. T. Flórez and J. A. Palacio, "Variación espacial y temporal en los contenidos de mercurio, plomo, cromo y materia orgánica en sedimento del complejo de humedales de Ayapel, Córdoba, noroccidente colombiano", Rev. Fac. Ing. Univ. Antioquia, no. 69, pp. 244-255, 2013.
Resumen : The Flood Plain Lakes of the Atlantic Colombian have been impacted by artisanal gold mining during last decades. However, the obtained results have been compared to action levels relevant to other latitudes and the investigations have not included other trace metals of sanitary interest. The present study contributed to understanding the spatial geochemical response controlled by hydrological pulse and organic matter (OM) composition within the Ayapel Flood Plain Lake influence area. We assessed the seasonal and spatial variations of mercury (Hg), lead (Pb), and chromium (Cr) content in recent Ayapel Flood Plain Lake sediments and then compared them with the determined local pollution level of Hg (0.032 µg g-1), Pb (2.39 µg g-1) and Cr (89.58 µg g-1) found in Betulia Formation. The ranges of metal content were 0.008-0.117 µg Hg g-1, 1.090-11.870 µg Pb g-1, and 5.350-93.430 µg Cr g-1. Hg showed the largest spatial variation (0.083 ± 0.064 µg g-1) and the highest values at the distributaries of the former gold mining fronts. About 91% of samples displayed Pb enrichment (6.376±4.048 µg g-1) and 66.6% Hg enrichment when compared with the reference levels. In contrast, Cr content was relatively low (96.325±29.868 µg g-1) and showed a decreasing trend from East towards West. The sediment was mainly inorganic (88.154 ± 3.822 %) with depleted OM levels (11.846 ± 3.822 %). The results suggested enhanced Hg motility owing to a high respiration rate of OM about the centre of the main water table. The sediment resuspension and migration was facilitated by thermal instability of the water column influenced by wind action.
ISSN : 01206230
24222844 E
Aparece en las colecciones: CIA (Centro de Investigaciones Ambientales y de Ingeniería)

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