Regresar

Resumen del producto

López López, S., E., Shumilin, G.M., Rodríguez Figueroa, Á.R., Jiménez Illescas, M.P., Jonathan, G.D., Rodríguez Meza & D.O., Cuauhtle-Mora (2012). Present-day levels of heavy metals and lanthanide shale-normalized patterns in marine sediments from Santa Rosalía copper mining región, Baja California península. 1er Congreso Internacional de la Red de Medio Ambiente. Querétaro, Querétaro, México, noviembre 7 - 9, 2012, 91.

Present-day levels of heavy metals and lanthanide shale-normalized patterns in marine sediments from Santa Rosalía copper mining región, Baja California península

Silverio López López, Evgueni Shumilin, Griselda Margarita Rodríguez Figueroa, Ángel Rafael Jiménez Illescas, Muthuswami Ponniah Jonathan, Guadalupe Durga Rodríguez Meza y Daniela Ollin Cuauhtle-Mora

Contaminated marine sediments from coastal zone of Santa Rosalía are characterized by anomalously high concentrations of Co, Cu, Mn, Zn and other elements, discharged within the solid wastes derived from ancient mining and smelting of copper ores. New “El Boleo” company is preparing to initiate its activities and is planning of the exploitation of the copper mineral deposit for the next 30-50 years. Considering the geological setting, and the old and new mining actions in the region, 100 sediments samples were collected using scuba diving at depths less than 20 m and grab sampler till the depths of 200 m in 2011 for to know actual levels of heavy metals along the coastal shelf. The total contents of 50 elements were measured after concentrated strong acid digestion of dried and homogenized sediment subsamples using ICP-OES and ICP-MS techniques. Effect range-low (ERL) and effect range-median (ERM) guideline values were used as criterions of the contamination status of the collected sediments. About 50% of the surface sediment samples in the study area exceeded the ERM value of 270 mg kg-1 proposed for Cu, a principal pollutant for this environment. The sediment samples of the area adjacent to new of “El Boleo” company showed much smaller contents of potentially toxic elements, but still mostly higher than 34 mg kg-1 of ERL guideline value for copper that implicate the incidence of a possible adverse effects near 10%. Respect to the average enrichment factors (EF) calculated using Al as a normalizer for the sediment with Cu content higher than ERM, the enriched elements in this marine environment showed the following sequence: Cu (108)> Zn(26.5) > Co(24.5) > Mn (20.5) > Cd (12.5) > Bi (10.4) > U (10.2) > Pb(6.3) > Sb(5.1) > Ag (3.92) > Ba (3.59)> Ni (3.15 ) > V(2.5). In respect to lanthanides shale-normalized patterns (NASC as a reference material) practically all analyzed surface sediment samples display positive europium anomaly, that is a direct evidence to certain extent of the anthropogenic impact of ancient copper mining and smelting on the chemical composition of coastal sediments in the study area.

Palabras clave: Aggregata; Lanthanides; marine sediments; Heavuy metals

Para obtener una copia del documento contacta la personal de la biblioteca a través del correo bibliocicimar{a}ipn.mx

Regresar