Quality reference values for rare earth elements in soils from one of the last agricultural frontiers in Brazil
| Autor: | Clístenes Williams Araújo do Nascimento, Antonny Francisco Sampaio de Sena, Eliabe Barros de Oliveira, Yuri Jacques Agra Bezerra da Silva, Marcos Paulo Rodrigues Teixeira, Vijay P. Singh, Cácio Luiz Boechat, Ygor Jacques Agra Bezerra da Silva, Tatiana dos Santos Silva, Ronny Sobreira Barbosa |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
REE geochemistry Agriculture (General) Rare earth Gurguéia watershed 04 agricultural and veterinary sciences 01 natural sciences S1-972 Environmental chemistry Reference values Soil water 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science lanthanides Oxisols 010606 plant biology & botany |
| Zdroj: | Scientia Agricola, Volume: 78 Supplement 1, Article number: e20200069, Published: 02 APR 2021 Scientia Agricola v.78 suppl.1 2021 Scientia Agrícola Universidade de São Paulo (USP) instacron:USP Scientia Agricola, Vol 78, Iss suppl 1 (2021) |
| Popis: | Environmental impacts caused by the addition of rare earth elements (REEs) to agricultural soils are a growing concern. The sedimentary basin of the Gurguéia River is located in one of the last agricultural frontiers in Brazil; nevertheless, data regarding quality reference values (QRVs) for REEs in soils are still scarce. The objective of this study was therefore to determine the natural concentration and establish the QRVs of REEs in soils of Gurguéia watershed, Brazil. Fifty-five composite soil samples were collected at sites under no or minimal anthropic interference. The average REE natural concentrations in soils from the Gurguéia watershed were lower than those found in other regions of Brazil and worldwide, following the order (mg kg−1): Ce (14.01) > Nd (6.19) > La (5.52) > Pr (2.51) > Sm (1.45) > Gd (0.93) > Dy (0.63) > Er (0.42) > Yb (0.39) > Tb (0.28) > Eu (0.26) > Lu (0.20). The parent material was the main factor that controlled the distribution of REEs in soils. The QRVs in soils followed the order (mg kg−1): Ce (18.8) > Nd (7.92) > La (6.32) > Pr (3.3) > Sm (1.97) > Gd (1.35) > Dy (0.85) > Er (0.55) > Yb (0.47) > Tb (0.37) > Lu (0.25). These values serve as a basis to assist the development of legislation, including REE thresholds for Brazilian soils. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|