Screening for natural manganese scavengers: Divergent phytoremediation potentials of wetland plants

Author(s)

Ferreira, Amanda Duim ; Queiroz, Hermano Melo ; Barcellos, Diego ; Otero, Xose L. ; Nobrega, Gabriel Nuto ; Bernardino, Angelo Fraga ; Ferreira, Tiago Osorio

• Document type: Journal article
• Source: JOURNAL OF CLEANER PRODUCTION; v. 365, p. 11-pg., 2022-09-10.

Abstract

Manganese is a potentially toxic micronutrient with great ecological risk. In wetland soils, Mn bioavailability increases sharply with contamination hazards. Wetland plants may have different effects on Mn mobility and reactivity in soils, affecting their phytoremediation potential. This study evaluated the role of three naturally occurring wetland plants (i.e., Hibiscus tiliaceus, Eleocharis acutangula, and Typha domingensis) in Mn biogeochemistry and screened their potential for phytoremediation in an Mn-contaminated estuary (Doce River estuary; SE-Brazil). Shoots, roots, and soils (0-40 cm) of each plant species were sampled. Soil physicochemical parameters (i.e., pH, rhizospheric pH, and redox potentials) were measured, and Mn concentrations were determined in the plant tissues, root iron plaques, and soils. In addition, Mn geochemical fractionation was performed on the studied soils. Our results reveal that T. domingensis is highly efficient at Mn phytoremediation. T. domingensis showed unprecedented Mn shoot concentrations (6858 mg kg(-1)), translocation (TF; 99.5), and bioconcentration factors (BCF; 11.7). We revealed that rhizospheric acidification promoted by T. domingensis significantly altered the soil Mn geochemistry, favoring its acquisition from iron plaques and short-range-ordered Mn oxides. In contrast, despite the high Mn bioavailability, E. acutangula and H. tiliaceus showed Mn concentrations 13- and 10-fold lower than those recorded for T. domingensis. Naturally growing T. domingensis is able to phytoextract 147 tons of Mn (~19,000 m(2)), which represents a removal of 75.7 ton ha(-1). The Mn phytoextraction potential of T. domingensis should be assessed in association with different phytotechnologies and agronomic practices to maximize its phytoextraction efficiency. (AU)

• FAPESP's process: 21/00221-3 - From sinks to sources: vulnerability of mangrove soils as carbon sinks in the face of global climate change
• Grantee: Hermano Melo Queiroz
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 18/04259-2 - Iron biogeochemistry and its control on dynamics of trace metals in the soils of Doce River estuary after the "Mariana disaster"
• Grantee: Hermano Melo Queiroz
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 19/19987-6 - Soils and plants of the Rio Doce estuary controlling the biogeochemistry of iron and metals in response to the Mariana (MG) disaster
• Grantee: Tiago Osório Ferreira
• Support Opportunities: Regular Research Grants
• FAPESP's process: 18/08408-2 - Comparative studies of the mineral transformation of iron oxide nanoparticles in mine-tailing affected sediments and soils and their impacts on mobilization and fixation of heavy metals under two contrasting redox environments
• Grantee: Tiago Osório Ferreira
• Support Opportunities: Regular Research Grants
• FAPESP's process: 19/14800-5 - Estuarine plants and their control in metals biogeochemistry in soils impacted by the `Mariana disaster´
• Grantee: Amanda Duim Ferreira
• Support Opportunities: Scholarships in Brazil - Doctorate