27 results

Field experiment pitting magnetite nanoparticles against microparticles: Effect of size in the rehabilitation of metalcontaminated soil

Ivan A. Smorkalov ORCID logo , Evgenii L. Vorobeichik ORCID logo , Artur A. Dzeranov ORCID logo , Denis A. Pankratov ORCID logo , Elvira A. Dovletyarova ORCID logo , Carolina Yáñez ORCID logo , [...]

03/Oct/2023

ABSTRACT A significant portion of the current knowledge regarding the use of iron nanoparticles for remediating metal-contaminated soils is derived from laboratory experiments, leaving several unanswered questions. This article presents a field experiment comparing the efficacy of magnetite nanoparticles and microparticles for the immobilization of metals and the growth of plants in metal-contaminated soils. This study aimed to investigate the effects of magnetite particle size on metal immobilization and plant growth in soils exposed to airborne pollution from the Middle-Urals […]

Visual Abstract

Epi and endosaturation affecting redoximorphic features and pedogenesis in subtropical soils with high textural contrast developed from sedimentary rocks

Jaime Antonio de Almeida ORCID logo , Pablo Grahl dos Santos ORCID logo

11/Nov/2021

ABSTRACT Soils in the Depressão Central and Campanha Gaúcha in Rio Grande do Sul State, Brazil, developed from sedimentary rocks are mainly Alfisols (Luvissolos, Planossolos and Plintossolos) and Ultisols (Argissolos) with high textural contrast between A and/or E horizons and clayey B horizons. Red Ultisols dominate in well-drained areas in the summit. But many soils present redoximorphic features on the backslope and footslope, with mottled and/or nodules similar to plinthite due to the oscillating of the water table above the […]

Visual Abstract

Validation of a Standard Operating Procedure (SOP) for Forensic Soils Investigation in Brazil

Samara Alves Testoni ORCID logo , Vander Freitas Melo ORCID logo , Lorna Anne Dawson ORCID logo , Fábio Augusto da Silva Salvador ORCID logo , Paulo Akira Kunii ORCID logo

04/Sep/2019

ABSTRACT Soil traces are useful as forensic evidence due to their potential to transfer and adhere to different types of surfaces on a range of objects or persons. Several works have been developed in forensic soils, under different analytical approaches. However, in Brazil, only the researches from the Group of the Federal University of Paraná have developed works with soils under a forensic approach. Focus has been given on the sequential chemical analyses and mineralogical techniques once they presented a […]

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Reversibility of the Hardening Process of Plinthite and Petroplinthite in Soils of the Araguaia River Floodplain under Different Treatments

Angélica Pires Batista Martins, Glenio Guimarães Santos, Virlei Álvaro de Oliveira, Deyvid Diego Carvalho Maranhão, Leonardo Santos Collier

18/Jun/2018

ABSTRACT Although ferruginous materials occur frequently in soils of tropical regions, information about the reversal of the hardening process of these materials is scarce. This study assessed the influence of different chemical treatments and periods of immersion on the reversibility of the hardening process of plinthite and petroplinthite in soils of the Araguaia River plain. Soil samples were collected from the plinthic horizons in 0.10 m high and 0.15 m diameter PVC cylinders and divided into subsamples with a rock […]

Chemical-Mineralogical Characterization of Magnetic Materials from Magnetic Soils of the Southern Espinhaço Mountain Chain and of the Upper Jequitinhonha Valley, State of Minas Gerais, Brazil

Alexandre Christófaro Silva, Solange de Souza, José Domingos Fabris, Maurício Soares Barbosa, Uidemar Morais Barral, Roberto Vial Costa

09/Mar/2017

ABSTRACT In the Southern Espinhaço Mountain Chain and in the Upper Jequitinhonha Valley, magnetic soils, in different pedogenetic stages, are found to be forming over intrusions of basic lithology. The essential chemical and mineralogical properties of samples from magnetic soil profiles from those two physiographic environments in the state of Minas Gerais, Brazil, are reported. Three of the pedons (Rhodic Kandiustox – RKox, Rhodic Haplustox – RHox, and Typic Argiustoll – TAoll) were identified as being indeed developed over basic […]

Pedogenesis and classification of latosols developed from itabirites in the region of Quadrilátero Ferrífero in Minas Gerais

Samuel Ângelo Diógenes Costa, João Carlos Ker, Diana Ferreira de Freitas Simões, Maurício Paulo Ferreira Fontes, José Domingos Fabris, Felipe Vaz Andrade

01/Apr/2014

Located in the Midwest of the State of Minas Gerais, a region called Quadrilátero Ferrífero covers an area of approximately 7,000 km2. Since the seventeenth century, it is known as gold- and iron-producing province, and the geological context is therefore one of the best-studied of Brazil. The regional topography is very rugged, with mostly poorly developed pedogenesis, especially Cambissolos Háplicos, Neossolos Litólicos and Neossolos Regolíticos. In a smaller proportion and on colluvial ramps (hilly relief), very Fe-rich Latossolos Vermelhos occur, […]

Mineral assemblage of soils developed from different lithologies in southern Minas Gerais, Brazil

Marla Alessandra Araujo, Alessandro Vitor Pedroso, Douglas Carvalho Amaral, Yuri Lopes Zinn

01/Feb/2014

Systematic studies on of soil formation factors are relatively scarce in Brazil since comprehensive samplings of a variable factor while keeping others constant are difficult to perform. Near Lavras, Minas Gerais, there is wide geological diversity over a small area, which offers a chance to assess the control exerted by different lithologies on mineral suites and other soil properties. Thus, eight soils overlying quartzite, mica-schist, gabbro, itabirite, serpentinite, meta-limestone, gneiss and phyllite, under similar climate and tropical, semideciduous forest conditions […]

Mineralogy of the clay fraction of Alfisols in two slope curvatures. III – spatial variability

Livia Arantes Camargo, José Marques Júnior, Gener Tadeu Pereira

01/Apr/2013

A good knowledge of the spatial distribution of clay minerals in the landscape facilitates the understanding of the influence of relief on the content and crystallographic attributes of soil minerals such as goethite, hematite, kaolinite and gibbsite. This study aimed at describing the relationships between the mineral properties of the clay fraction and landscape shapes by determining the mineral properties of goethite, hematite, kaolinite and gibbsite, and assessing their dependence and spatial variability, in two slope curvatures. To this end, […]

Humic substances and their interactions with Fe and Al in a subtropical oxisol under different pasture management systems

Graciele Sarante Santana, Deborah Pinheiro Dick, Aino Victor Ávila Jacques, Guilherme da Silva Chitarra

01/Apr/2011

Pasture management systems are, in general, based on the grazing intensity and pressure, dry forage cutting, soil fertility improvement or vegetation burning. In view of the influence of soil management systems on soil organic matter (SOM) dynamics, this study aimed to evaluate soil carbon and nitrogen distribution, and to investigate humic substances (HS) and their interactions with Fe and Al ions in a subtropical Oxisol in the following environments: native pasture without burning for the last 41 years, native pasture […]

Maximum phosphorus adsorption capacity as related to iron and aluminum forms in subtropical soils

Cesar Crispim Vilar, Antonio Carlos Saraiva da Costa, Allan Hoepers, Ivan Granemann de Souza Junior

01/Aug/2010

Phosphorus is among the macronutrients the least absorbed by plants. Nevertheless, the amount of P-containing fertilizers applied to humid tropical and subtropical soils in relatively high. The reason is the strong interaction between of P and Fe and Al oxides, which are abundant in these soils. The study of these interactions is fundamental to know more about the relations between phosphorus adsorption and soil constituents. The objective of this study was to evaluate how the minerals in the clay fraction, […]

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