Trace metals geochemistry in the sediments of a natural wetland Article uri icon

abstract

  • Bottom sediments were collected in natural wetland to evaluate the concentrations of Fe. Mn. other metals, sulfides, sulfate and pH with depth in the sediments and hi the porewater. Our results suggest a geochemical control of Fe from sulfides which varies within season. At the end of spring (May), the metals mobilization occurs probably related to a major productivity of this ecosystem in contrast with the shape of profiles observed hi fall (November). This interaction between Fe and sulfides are probably controlling other metals and the availability of nutrients like P, to the plants hi the wetland. Diffusion fluxes at the sediment-water interface suggested a contribution of Fe from the sediments to the water column particularly: the concentration profiles suggest the diffusion of Mn from the sediment to the water column and a contribution of Cd, Hg. As and Ni to the sediments from the water column. The sediments in the wetland are reduced and characterized for a high production of sulfides. © 2018, Centro de Ciencias de la Atmosfera, UNAM. All rights reserved.

publication date

  • 2018-01-01