Distribution and enrichment of trace metals and arsenic at the upper layer of sediments from Lerma River in La Piedad, Mexico: case history

• Published in: Environmental earth sciences Vol. 75; no. 23; p. 1
• Main Authors: Villalobos-Castañeda, Benjamín, Cortés-Martínez, Raúl, Segovia, Nuria, Buenrostro-Delgado, Otoniel, Morton-Bermea, Ofelia, Alfaro-Cuevas-Villanueva, Ruth
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-12-2016; Springer Nature B.V
• Subjects: Arsenic; Biogeosciences; Copper; Domestic wastewater; Dry season; Earth and Environmental Science; Earth Sciences; Environmental Science and Engineering; Geochemistry; Geology; Hydrology/Water Resources; Industrial wastewater; Lead; Metal concentrations; Metals; Original Article; Outlets; Pollution control; Population growth; Rainy season; Rivers; Sediment samplers; Sediments; Statistical analysis; Terrestrial Pollution; Trace elements; Trace metals; Wastewater disposal; Zinc; Mexico; Lerma River; Mexico; Arsenic; Sediments; Lerma River; Trace metals
• ISSN: 1866-6280; 1866-6299
• DOI: 10.1007/s12665-016-6251-8

Lerma River is one of the largest rivers in Mexico. Over the past 20 years, unplanned population growth occurred along its course and the river has been used as the only outlet for industrial and domestic wastewater disposal. The aim of the present study was to determine trace metals such as Cr, Ni, Cu, Zn, Fe, Pb, and arsenic concentrations at the upper layer of sediments of the Lerma River meander in La Piedad, Michoacan, Mexico. Sediment samples were collected from eight different sites during the rainy and dry seasons. All samples were physically characterized, and concentration values of trace metals and As were determined. On the basis of protection criteria for freshwater sediments, concentrations of Fe, Zn, Cu, Ni, and Pb were found to exceed the lowest effect level; moreover, the concentrations were found to exceed the severe effect level at some sites, particularly for Cu. Statistical analyses showed significant differences between sampling seasons for Fe and As, and among sites for Ni, Cu, Zn, and Pb. In addition, the enrichment factor indicates the following order Zn > Cr > Cu > Ni > Pb > As, and the geoaccumulation index (
I
geo
) indicates contamination in the following order Zn > Cr > Cu > Ni > As > Pb. The Lerma River meander in La Piedad shows a reduction in pollution by trace metals and arsenic near the drain area and downstream of the meander. However, there are significantly higher concentrations of these elements in sediments of sites located in the middle part of the city.