Identification of potential plant species hyperaccumulating light rare earth elements (LREE) in a mining area in Minas Gerais, Brazil

Author(s)

Ashraf, Nermeen ; Rodrigues, Eduardo Santos ; de Almeida, Eduardo ; Montanha, Gabriel Sgarbiero ; Abreu-Junior, Cassio Hamilton ; Vitova, Milada ; Garcia, Rafael Henrique Lazzari ; Kupper, Hendrik ; de Carvalho, Hudson Wallace Pereira

• Document type: Journal article
• Source: Environmental Science and Pollution Research; v. 29, n. 60, p. 12-pg., 2022-07-25.

Abstract

Phytoextraction of rare earth elements (REE) from contaminated soils has gained importance during the last few decades. The Pocos de Caldas municipality in Brazil is known for its mineral richness, including large reserves of REE. In this study, we report light REE (La, Ce, Sm, Pr, and Nd) in soils and plants collected in an area. Composite soil samples and plant individuals were collected, and total concentrations of LREE in soils were determined by wavelength dispersive X-ray fluorescence (WDXRF). The plant available LREE concentrations in soils were estimated upon the acetic acid method (F1 fractions) of the stepwise sequential extraction procedure, together with plant content that was analysed by inductively coupled plasma mass spectrometry (ICP-MS). The total sum concentrations of tested LREE in soils varied from 5.6 up to 37.9 g kg(-1), the bioavailable fraction was ca. 1%, and a linear relationship was found between them. The only exception was Sm, whose availability was lesser and did not show a linear relationship. The concentration of LREE in non-accumulator plants varied from 1.3-950 mg kg(-1) for Ce, La 1.1-99 mg kg(-1), Sm 0.04-9.31 mg kg(-1), Pr 0.1-24.1 mg kg(-1), and Nd 0.55-81 mg kg(-1). The concentration of LREE among shoots did not show a linear relation either with the available fraction or total content. The screening also revealed Christella dentata (Forssk.) Brownsey & Jermy, Thelypteridaceae family, as a promising hyperaccumulator species. The concentrations of LREE among shoots of six individuals of this species were in the ranges from 115 to 1872 mg kg(-1) for Ce, La 190-703 mg kg(-1), Sm 9-48 mg kg(-1), Pr 32-144 mg kg(-1), and Nd 105-478 mg kg(-1). (AU)

• FAPESP's process: 17/16375-4 - Effects of foliar application of La and Ce on soybean
• Grantee: Eduardo Santos
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 20/11546-8 - Efficiency of foliar application of different sources of calcium in tomatoes: understanding and bypassing low phloem mobility
• Grantee: Eduardo Santos
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 20/07721-9 - Time-resolved element mapping and characterization of storage proteins during soybean seeds development: a bottom-up strategy to increase protein content and quality
• Grantee: Gabriel Sgarbiero Montanha
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)