Background levels of selenium in some selected Brazilian tropical soils

Gabos, Mariana Bassetto; Alleoni, Luís Reynaldo Ferracciú; Abreu, Cleide Aparecida de

doi:10.1016/j.gexplo.2014.05.007

Cited by 56 publications

(27 citation statements)

References 28 publications

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“…1). It is characterized by 44 million inhabitants living in an area of around 250,000 km 2 (Gabos et al, 2014), representing the Brazil's biggest consumer market and agro-industry economy, contributing 33% of the Brazilian Gross National Product (IBGE, 2014).…”

Section: Study Areamentioning

confidence: 99%

“…1016/j.jenvman.2018.05.048 Received 20 March 2018Received in revised form 14 May 2018;Accepted 15 May 2018 While the PV and IV are established by the CONAMA Resolution (human health-based risk), and valid for the whole country, whereas QRV must be determined by each state (CONAMA, 2009). Consequently, studies have been carried out to establish QRV for some Brazilian regions (Paye et al, 2010;Biondi et al, 2011;Santos and Alleoni, 2012;Gabos et al, 2014;Oliveira et al, 2014;Preston et al, 2014;Almeida Júnior et al, 2016;Silva et al, 2017). However, a lot of areas have been partially or totally neglected.…”

Section: Introductionmentioning

confidence: 99%

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Background concentrations and quality reference values for some potentially toxic elements in soils of São Paulo State, Brazil

Nogueira

Abreu-Junior

Alleoni

et al. 2018

Journal of Environmental Management

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Quality reference values (QRV) for potentially toxic elements (PTE) in soils are established as a tool for prevention and monitoring of soil pollution. These values should be periodically revised in order to ensure soil safety for agricultural purposes. Brazil is market leader for several commodities; therefore, the safety of Brazilian soils is of worldwide strategic importance. The objective of this study was to determine the natural background concentrations and the QRV for As, Ba, Cd, Cr, Ni, Pb, Se, and Zn by investigating 30 representative pedotypes in the São Paulo State, one of the most important agro-industry economy at worldwide level. Multivariate statistical analysis was applied to determine the sources of PTE and their variability. The mean natural background concentrations of PTE in the soils were generally lower to those reported in literature. QRV, calculated for each element as the 75th and 90th percentiles, were lower (75th for As, Cd, Pb, and Zn), similar (75th for Ba, Cr, and Se) or above (90th for Ba, Cr, and Se and 75-90th for Ni) those previously proposed by the Brazilian environmental protection agencies. The results indicate that 75th percentile may be too restrictive. The PTE in the investigated soils appear to have comes mainly from two primary natural sources: a prevalent one of geogenic and a secondary of pedogenic origin. These results confirm the predominant natural source of selected PTE in the investigated soils, thus sustaining the possibility of using the data set to develop QRV for the State of São Paulo.

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Section: Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Background concentrations and quality reference values for some potentially toxic elements in soils of São Paulo State, Brazil

Nogueira

Abreu-Junior

Alleoni

et al. 2018

Journal of Environmental Management

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“…Humidified organic matter (represented by TOC) increased the density of negative electrical charge in the more superficial horizons of the studied profiles, specially in Profiles 3 and 5, which were derived from sedimentary materials. Humidified organic matter is even more important for the CEC of soils due to the low density of negative charge originating from the 1:1 secondary phyllosilicates in the clay fraction, such as kaolinite (Gabos et al 2014). …”

Section: Acta Amazonicamentioning

confidence: 99%

“…However, since these are secondary forms of Fe, the vertical distribution of Fed was strongly influenced by the action of pedogenetic processes, such as argilluviation (Gabos et al 2014).…”

Section: Acta Amazonicamentioning

confidence: 99%

Association between parent materials and soil attributes along different geological environments in western Pará, Brazil

et al. 2018

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The expansion of the agricultural frontier into different geological environments in the west of the state of Pará, northern Brazil, makes it necessary to know the influence of the parent material on local soil attributes. This study aimed to evaluate the influence of different parent materials on five soil profiles along a lithosequence exposed by the BR-163 highway, which runs from north to south through western Pará. The soils were classified, morphologically described and their main horizons sampled for physical, mineralogical and chemical analyses, including the determination of micronutrients, forms of phosphorus and secondary forms of iron. Multivariate analysis was used to group the different soil-parent material associations. The results demonstrated that the diversity of the parent material was a determinant of soil attributes, and was a conditioning factor for the formation of different clay minerals. Multivariate analysis grouped the soils along the lithosequence into a group formed by profiles derived from basic and intermediate igneous rocks, and a second group consisting of profiles derived from sediments and sedimentary rocks. The profile derived from acidic igneous rock showed greater similarity with the profiles derived from sedimentary materials in comparison to those derived from other igneous rocks.KEYWORDS: soil mineralogy, physical attributes, chemical attributes, multivariate analysis Associação entre materiais de origem e atributos de solos ao longo de diferentes ambientes geológicos no oeste do Pará, Brasil RESUMO A expansão da fronteira agrícola em diferentes ambientes geológicos no oeste do Estado do Pará, norte do Brasil, torna necessário conhecer a influência do material de origem sobre os atributos dos solos locais. Este estudo teve como objetivo avaliar a influência de diferentes materiais de origem sobre cinco perfis de solo ao longo de uma litosequência exposta pela rodovia BR-163, que vai de norte a sul pelo oeste do Pará. Os solos foram classificados, morfologicamente descritos e seus principais horizontes amostrados para análises físicas, mineralógicas e químicas, incluindo a determinação de micronutrientes, formas de fósforo e formas secundárias de ferro. Análises multivariadas foram usadas para agrupar as diferentes associações solo-material de origem. Os resultados demonstraram que a diversidade do material de origem foi determinante para os atributos do solo, sendo um fator condicionante para a formação de diferentes argilominerais. A análise multivariada agrupou os solos ao longo da litosequência em um grupo formado por perfis derivados de rochas ígneas básicas e intermediárias, e um segundo grupo constituído por perfis derivados de sedimentos e rochas sedimentares. O perfil derivado de rocha ígnea ácida apresentou maior similaridade com os perfis derivados de materiais sedimentares em comparação àqueles derivados de outras rochas ígneas. PALAVRAS-CHAVE

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“…Se is a trace element widespread in various geochemical environments [5], and its average content in the earth's crust is estimated at 0.05 mg kg −1 . However, concentrations exceeding 0.5 mg kg −1 can be found.…”

Section: Introductionmentioning

confidence: 99%

Selenium Biofortification and the Problem of its Safety

Prado¹,

Cruz²,

Ferreira³

2017

Superfood and Functional Food - An Overview of Their Processing and Utilization

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Selenium is an essential mineral element to humans and animals because it is an important component of selenoproteins that are important for functioning of the metabolism. Because of poor soil conditions in various regions of the world, the enrichment of edible plants with selenium via the biofortification strategy has been implemented. However, selenium in the context of plant mineral nutrition appears twofold due to its biofortifying character at low concentrations and toxicity at high concentrations. In this sense, understanding of the functional mechanisms in which selenium is involved is important, ranging from its absorption and assimilation in organic compounds to its beneficial or harmful effects, considering its role in food security and human health. Therefore, this chapter addresses the key aspects related to selenium in the soil-plant-man environment and the narrow limit between biofortification and toxicity, as well as the main scientific findings on this mineral element in the biochemical, physiology and plant nutrition contexts.

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Background levels of selenium in some selected Brazilian tropical soils

Cited by 56 publications

References 28 publications

Background concentrations and quality reference values for some potentially toxic elements in soils of São Paulo State, Brazil

Background concentrations and quality reference values for some potentially toxic elements in soils of São Paulo State, Brazil

Association between parent materials and soil attributes along different geological environments in western Pará, Brazil

Selenium Biofortification and the Problem of its Safety

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