Next Article in Journal
Dynamic Test and Analysis of the Structure of the Stadium Stand in Suzhou Industrial Park
Previous Article in Journal
Use of Digestate as Organic Amendment and Source of Nitrogen to Vegetable Crops
Article

Soil Acidification, Mineral Neoformation and Heavy Metal Contamination Driven by Weathering of Sulphide Wastes in a Ramsar Wetland

Department of Earth Sciences, University of Huelva, 21071 Huelva, Spain
*
Author to whom correspondence should be addressed.
Academic Editors: Svetlana Bortnikova and Nataliya V. Yurkevich
Appl. Sci. 2022, 12(1), 249; https://doi.org/10.3390/app12010249
Received: 2 December 2021 / Revised: 21 December 2021 / Accepted: 23 December 2021 / Published: 28 December 2021
Past waste disposal practices have left large volumes of sulphidic material stockpiled in a Ramsar wetland site on the Atlantic coast of southwestern Spain, leading to severe land degradation. With the aim of addressing this legacy issue, soil core samples were collected along two transects extending from the abandoned stockpiles to the adjacent marshland and subjected to XRD, SEM-EDS, ICP-OES and ICP-MS analyses. Sulphide oxidation has been shown to be a major driver of acid generation and metal leaching into the environment. The marsh soil receiving acid discharges from the sulphide wastes contains elevated levels (in mg kg−1) of Pb (up to 9838), As (up to 1538), Zn (up to 1486), Cu (up to 705), Sb (up to 225) and Tl (up to 13), which are retained both in relatively insoluble secondary minerals (mainly metal sulphates and oxides) and in easily soluble hydrated salts that serve as a transitory pool of acidity and available metals. By using a number of enrichment calculation methods that relate the metal concentrations in soil and their baseline concentrations and regulatory thresholds, there is enough evidence to conclude that these pollutants may pose an unacceptable risk to human and ecological receptors. View Full-Text
Keywords: pyrite; acid drainage; efflorescent sulphate salts; marsh soil; coastal wetland; Odiel river; Huelva estuary pyrite; acid drainage; efflorescent sulphate salts; marsh soil; coastal wetland; Odiel river; Huelva estuary
Show Figures

Figure 1

MDPI and ACS Style

Grantcharova, M.M.; Fernández-Caliani, J.C. Soil Acidification, Mineral Neoformation and Heavy Metal Contamination Driven by Weathering of Sulphide Wastes in a Ramsar Wetland. Appl. Sci. 2022, 12, 249. https://doi.org/10.3390/app12010249

AMA Style

Grantcharova MM, Fernández-Caliani JC. Soil Acidification, Mineral Neoformation and Heavy Metal Contamination Driven by Weathering of Sulphide Wastes in a Ramsar Wetland. Applied Sciences. 2022; 12(1):249. https://doi.org/10.3390/app12010249

Chicago/Turabian Style

Grantcharova, Mihaela M., and Juan C. Fernández-Caliani. 2022. "Soil Acidification, Mineral Neoformation and Heavy Metal Contamination Driven by Weathering of Sulphide Wastes in a Ramsar Wetland" Applied Sciences 12, no. 1: 249. https://doi.org/10.3390/app12010249

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop