Azucena Dotor

• National Autonomous University of Mexico

Contaminación de los sistemas acuáticos en México: ¿qué es y qué puedo hacer yo para ayudar a disminuirla? surgió en el año 2022 en la clase Contaminación, fuentes y procesos del programa de posgrado en Ciencias del Mar y Limnología de la Universidad Nacional Autónoma de México, como respuesta al interés y entusiasmo de los autores en aportar herra...

We investigated the spatial and temporal distribution of V and Cd in surface sediments of the Yucatan Shelf to establish current average values for the area. V and Cd concentrations are similar to those reported internationally for limestone rocks and surface marine sediments. The observed variability of V concentrations between cruises may be the...

This study analyzed 27 surface sediment samples from the Tamaulipas Continental shelf to determine the spatial–temporal distribution of V and Cd (spring–summer 2016; summer 2017). Average V concentrations (99 ± 18 mg g−1) were similar to that previously reported values for the area, while average Cd concentrations reflect uncontaminated sediments a...

Surface water samples from the Yucatan shelf presented Cd concentrations similar to those reported internationally for non-polluted coastal and marine waters. V concentrations, on the other hand, fall within the range of anthropogenically polluted waters (25% of the sampling sites). In the study area, the probable sources of V could be: (1) carbona...

Water isotopic ratios 18O/16O, 2H/H and 34S/32S in dissolved sulfates were measured to determine sulfur provenance and dominant processes of transport, and, distribution of As and metals in surface waters in the mining district of Taxco. Zinc, Cd, Cu, Fe, Pb and As were analyzed in river and stream waters located nearby mine tailings. δ18O and δD v...

The potential environmental threat from Pb in Mexican rivers impacted by historic mining activities was studied using geochemical, isotopic and statistical methods. Lead geochemical fractionation and factor analysis of fractionated and total Pb indicate that anthropogenic sources have contributed significantly to Pb concentrations, while natural so...

Water-sediment geochemical processes influencing As, Pb, Zn, Cu and Fe mobilization were investigated in a river within the historic mining area of Taxco, Mexico. Tailings wash off and acid mine drainage have led to concentrations of metals in sediments well above the regional background. Zinc and lead associate with the carbonate fraction, followe...