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| SILVA JÚNIOR, E. C. da; WADT, L. H. de O.; SILVA, K. E. da; BATISTA, K. D.; GUEDES, M. C.; OLIVEIRA JUNIOR, R. C. de; REIS, A. R. dos; LOPES, G.; BROADLEY, M. R.; YOUNG, S. D.; GUILHERME, L. R. G.. |
| The Amazon rainforest is a heterogeneous ecosystem and its soils exhibit geographically variable concentrations of trace elements. In this region, anthropic activities - e.g., agriculture and mining - are numerous and varied, and even natural areas are at risk of contamination by trace elements, either of geogenic or anthropogenic origin. A reliable dataset of benchmark values for selenium (Se), barium (Ba), and iodine (I) concentrations in soils is needed for use as a reference in research and public policies in the region. In this study, 9 selected sites in the Brazilian Amazon rainforest within areas represented by Oxisols and Ultisols were assessed for relevant soil physicochemical characteristics, along with the concentrations of total Se (SeTot),... |
| Tipo: Artigo de periódico |
Palavras-chave: Total concentration; Availability; Amazon soils; Quality reference values; Geogenic; Trace elements. |
| Ano: 2022 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1140996 |
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| Althaus,Daiana; Gianello,Clesio; Tedesco,Marino José; Silva,Kelly Justin da; Bissani,Carlos Alberto; Felisberto,Regina. |
| ABSTRACT: The parent geological materials and formation factors influence the chemical, physical, and mineralogical properties and composition of the soil. Therefore, the aims of this study were to determine the chemical and some physical and mineralogical properties of the soil useful for agricultural practice; to determine the natural contents of the semitotal metals in soils of the state of Rio Grande do Sul (Brazil); and to suggest use of the quality reference values (QRVs) in accordance with Resolution 420/2009 of the National Commission for the Environment (Conama). To determine some soil properties useful for agricultural, 254 surface soil samples from areas without known human influence (native grasslands or forests) were analyzed according to the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Native soils; Chemical properties; Heavy metals; Quality reference values. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100502 |
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| Ribeiro,Fernando Carlos Araujo; Lauria,Dejanira da Costa; Silva,José Ivan Rodrigues; Lima,Erica Souto Abreu; Amaral Sobrinho,Nelson Moura Brasil do; Pérez,Daniel Vidal. |
| ABSTRACT A first large-scale systematic survey of natural radioactivity contents of soils of the state of Rio de Janeiro is presented, focused on the establishment of Quality Reference Values (QRVs). Undisturbed soil samples were collected from 243 areas and analyzed by gamma spectrometry. The activity contents varied largely, ranging from 12.2 to 1,029 Bq kg−1 for 40K (geometric mean of 111.1 Bq kg−1), from 3.5 to 99.8 Bq kg−1 for 226Ra (geometric mean of 29.7 Bq kg−1), and from 5.4 to 314.5 Bq kg−1 for 228Ra (geometric mean of 67.1 Bq kg−1). The highest contents of radium isotopes were found in soils developed on igneous rocks (Leptosol), and the lowest in a soil of sedimentary origin (Podzol). Among the different soil types, the radioisotope contents... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Radium; Potassium-40; Quality reference values; Soil. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100500 |
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