Rare Earth Element Concentrations in Brazilian Benchmark Soils

Silva, Ygor Jacques Agra Bezerra da; Nascimento, Clístenes Williams Araújo do; Silva, Yuri Jacques Agra Bezerra da; Biondi, Caroline Miranda; Silva, Cinthia Maria Cordeiro Atanázio Cruz

doi:10.1590/18069657rbcs20150413

Cited by 21 publications

(15 citation statements)

References 46 publications

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“…The LREEs comprise 93 % of the total REEs in the soils, with Ce being the most abundant element. The contents of LREEs were similar to the contents found in soils from Pernambuco (Silva et al, 2016). However, the values were lower than those observed for the soils of China (Wei et al, 1991) and the (1) The extraction of REEs was performed according to USEPA (1998).…”

Section: Natural Content and Reference Values Of Rees In Rn Soilssupporting

confidence: 64%

“…The spatial distribution of CIA and Ca + Na 2 O + K 2 O + BaO is shown in figure 5. (Silva et al, 2016;Vermeire et al, 2016). This suggests that the chemical composition of the organic matter and the interaction of the chemical compartments with the REEs should be considered in future studies involving the geochemistry of these elements in soils.…”

Section: Influence Of the Major Elements And The Physical And Chemicamentioning

confidence: 99%

“…Some authors have observed a high correlation between REEs and Fe in tropical soils (Silva et al, 2016;Alfaro et al, 2018). This is logical because the process of weathering and crystallization of Fe oxides can release REEs.…”

Section: Introductionmentioning

confidence: 99%

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Geochemistry and Spatial Variability of Rare Earth Elements in Soils under Different Geological and Climate Patterns of the Brazilian Northeast

Silva

Barbosa

Nascimento

et al. 2018

Rev. Bras. Ciênc. Solo

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Growth in the agricultural and industrial sectors has increased the demand for rare earth elements (REEs) in the production of technological devices and fertilizers. Thus, the accumulation of these elements in the soil has become an environmental concern. Here, we aim to determine the natural contents of REEs in soils derived from different parent materials and under climatic conditions ranging from humid to semi-arid. We then evaluate the influence of major elements and soil properties on the geochemistry of REEs. The contents of REEs were determined using inductively coupled plasma optical emission spectroscopy. Major elements were determined by X-ray fluorescence spectrometry. The mean content of REEs in soils from Rio Grande do Norte (RN), Brazil, were in the followed order (mg kg -1 ): Ce (40.4) > La (18.9) > Nd (15.8) > Pr (7.3) > Sm (3.0) > Gd (2.6) > Dy (1.0) > Er (0.7) > Yb (0.6) > Eu (0.5) = Tb (0.5) > Ho (0.3) > Lu (0.2). The parent material was the main factor that governed the geochemistry of the REEs in soils of RN. Higher levels of REEs were observed in soils derived from igneous and metamorphic rocks. In contrast, sedimentary rocks -except for the region formed from limestone -generated soils with lower contents of REEs in the state. In addition, soils developed from the same parent material and under different climatic conditions showed the same geochemical signatures for REEs in soils. These results confirm the small effect of climate on REE geochemistry in soils of RN and lead to the conclusion that the geochemical signature of REEs in these soils reflects the composition of the underlying parent material. The lack of significant correlation between (La/Yb) N ratio and the Chemical Alteration Index also confirms the low influence of climate on soil REE geochemistry. Among the major elements, Fe and Si had a greater influence on soil REE geochemistry. Higher REEs were seen in areas with more Fe and less Si. These REE levels were clearly controlled by the type of parent material. The Nd, Sm, Tb, Dy, Ho, Yb, and Er levels showed strong spatial dependence; this dependence was moderate for the Pr, La, Ce, Eu, Gd, and Lu levels. Spatial variability maps of REEs are particularly important to identify areas under environmental impact. Our results represent the most detailed study of the surface geochemistry of REEs in Brazilian soils and contribute to the scarce data available on these elements in Brazil.

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Section: Natural Content and Reference Values Of Rees In Rn Soilssupporting

confidence: 64%

Section: Influence Of the Major Elements And The Physical And Chemicamentioning

confidence: 99%

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Geochemistry and Spatial Variability of Rare Earth Elements in Soils under Different Geological and Climate Patterns of the Brazilian Northeast

Silva

Barbosa

Nascimento

et al. 2018

Rev. Bras. Ciênc. Solo

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“…Soil carbon, nitrogen, potassium, and phosphorus are among the most important plant essential elements because the soil C:N:K:P ratio can reflect soil fertility and plant nutritional status; changes in the content and ratio of these elements can affect the growth and distribution of vegetation [58]. The ratio of soil C, N, and P is strongly influenced by soil type, vegetation community characteristics, climatic conditions, and the vegetation development stage [59,60]. In this study, TC and TN had a significantly positive correlation between soil P and K + ( Table 7).…”

Section: Changes In Soil Properties By Organic Fertilizer Applicationmentioning

confidence: 99%

Effects of Cultivating Rice and Wheat with and without Organic Fertilizer Application on Greenhouse Gas Emissions and Soil Quality in Khost, Afghanistan

2020

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The agricultural sector is the most important economic component in Afghanistan, as 80% of the population is involved. The improvement of cereal production is an urgent task to meet the nation’s demand for the staple within the limited arable land. To promote a sustainable crop production system, this study examined the soil quality to learn the basic knowledge of soil fertility and the environmental impact of different rice–wheat cropping systems in Khost, Afghanistan by using the life cycle assessment (LCA) method. The economic analysis of each farming system was conducted by the data gathered by the farmers’ interviews along with LCA data collection. The analysis considered the on-farm activities, which were required to produce 1 kg of wheat and rice. It included energy use, production, and farming inputs such as fertilizer and agrochemicals. Conventional farming with organic fertilizer application (CF+OF) was compared with conventional farming (CF). The LCA results showed the total greenhouse gas (GHG) emission was higher in rice production compared to wheat production. However, CO2 absorption by the crops was far greater than the total GHG emission in both systems and showed great potential for soil carbon sequestration for mitigation of global warming. The soil examination revealed the CF+OF system increased soil total carbon (TC), active C (AC), total N (TN), soil organic carbon storage (SCS), P, and K+ after four years of organic fertilizer application. The yield of each crop was slightly higher in the CF system; however, the CF+OF system increased net income by reducing the cost for fertilizer. The study concluded the CF+OF system can improve soil fertility in the long term while saving the farming operation cost. Further research is required to determine the best combination of practices to improve cattle manure characteristics and farm management for soil carbon sequestration to promote a sustainable farming system in the country.

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“…In addition, these elements have been applied to agriculture, aiming to increase the productivity and quality of agricultural crops, a practice primarily observed in China (Xiong, 2000), where commercial fertilizers are enriched with REE (Pang, Li, & Peng, 2013). Studies also show that REE are present in phosphate fertilizers (Otero, Vitória, Soler, & Canals, 2005;Turra, Fernandes, & Bacch, 2011) due to their presence in phosphatic rocks, which are used in fertilizer production (Al-Thyabat & Zhang, 2015;Ramos et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

<b>Lanthanum content and effects on growth, gas exchanges, and chlorophyll index in maize plants

Duarte

Oliveira

Ramos

et al. 2018

Acta Sci. Biol. Sci.

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Rare earth elements, such as lanthanum (La), have been applied to agriculture via fertilizers, aiming to increase the productivity and crop quality, such results observed mainly in China. However, the knowledge about the effect of La on maize growth, as well as for other species, despite the growing interest it is still limited. The aim of this study was to evaluate the effects of La on maize growth, La content, photosynthetic rate and chlorophyll content in maize plants in response to La treatment (0, 25, 50, 100, 150, 300 and 600 μM) in nutrient solution for three weeks. The plants were placed in geminated pots using a split-root technique. One of the pots in the geminated set was filled with a complete nutrient solution without La, while another was filled with a nutrient solution without phosphorus but containing different concentrations of La. It was verified that roots of maize plants can accumulate approximately sixty percent more La than shoots. Moreover, low La concentrations stimulated an increase in chlorophyll index, resulting in a slight increase in shoot biomass. At higher levels, La didn't reduce growth but caused a decrease in both photosynthetic rate and chlorophyll index.

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Rare Earth Element Concentrations in Brazilian Benchmark Soils

Cited by 21 publications

References 46 publications

Geochemistry and Spatial Variability of Rare Earth Elements in Soils under Different Geological and Climate Patterns of the Brazilian Northeast

Geochemistry and Spatial Variability of Rare Earth Elements in Soils under Different Geological and Climate Patterns of the Brazilian Northeast

Effects of Cultivating Rice and Wheat with and without Organic Fertilizer Application on Greenhouse Gas Emissions and Soil Quality in Khost, Afghanistan

<b>Lanthanum content and effects on growth, gas exchanges, and chlorophyll index in maize plants

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