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New method to estimate total elements of chromium (VI), nickel and iron to analyze their mobility and spatial distribution from an open dump

Abstract:

Open dumps are a global problem due to their scant planning studies. In Ecuador, many of the dumps are of this type, operating for several years, as in the case of the open dump of Portoviejo, which is in its technical closure stage. The current study determined the physical-chemical characterization of the soils around the dump, and the concentration in aqueous extracts of Chromium (Cr (VI)), Nickel (Ni) and Iron (Fe). Therefore, a methodology for the estimation of total, soluble and fixed elements based on the theory of maximums and minimum through leaching curves have been proposed. The results have been compared with the permissible concentration limits of the Ecuadorian Regulation where Ni presents serious enrichment. Finally, the spatial distribution of the soluble elements have been performed in order to relate to the processes of mobility and availability in the soil, this let know that soils with possible contamination problems are oriented to the southern part of the dump towards the city of Portoviejo and could possibly be causing pollution in that area.