Spatial variation of metal(loid)s in sediments of an Atlantic mesotidal estuary (Sado estuary, Portugal)
Year: 2024
Type: article
Abstract: Estuaries offer favorable conditions for human settlement. As a result, pollutants, such as metals, have been released to these systems. Those are adsorbed by particulate material that tend to settle at the bottom and sink in the sediment. This article analyses the results of metals in sediments of the Sado estuary (Portugal) on a large spatial scale, to differentiate areas according to their impacts and possible sources. The metals were analyzed by Atomic Absorption Spectroscopy and a Direct Mercury Analyser. Higher concentrations, particularly of As, Cr and Zn ([32, 40] mg/kg, [102, 115] mg/kg, [672, 896] mg/kg) were observed at upstream areas of the Alcácer and Marateca channels. Both anthropogenic and natural origins in the area were considered to understand the results, such as industrial activities and geological context. Overall, the concentrations registered do not reach levels of contamination, and the improvement in the quality of the estuary is reflected. • Higher enrichment in As, Cr and Zn were noted in isolated areas of the estuary. • These same areas were previously noted as sites of aquaculture and nesting. • Natural and anthropogenic origins are considered in assessing the metals distribution. • First study to consider the train line as a source of metals in the estuary.
Source: Marine Pollution Bulletin
Institutions: Instituto Hidrográfico, University of Lisbon
Language: English
Topic: Heavy metals in environment
Subfield: Pollution
Field: Environmental Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,630
OpenAlex ID: W4404120949