The geochemistry of Thai paddy soils

Prakongkep, N.; Suddhiprakarn, A.; Kheoruenromne, Irb; Smirk, Michael; Gilkes, Robert

doi:10.1016/j.geoderma.2007.11.025

Cited by 43 publications

(23 citation statements)

References 31 publications

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“…An increase of soil fertility, crop productivity and an increase of water availability due to higher soil organic carbon and clay deposits were linked with fields situated at the lower slope positions of a terrace sequence (Homma et al, 2003;Tsubo et al, 2007;Boling et al, 2008;Rüth and Lennartz, 2008). These processes alter the soil chemistry of fields mainly at the footslope position (Tachibana et al, 2001) especially clay composition was altered and smectite genesis was induced (Prakongkep et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Sediment induced soil spatial variation in paddy fields of Northwest Vietnam

et al. 2010

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Section: Introductionmentioning

confidence: 99%

Sediment induced soil spatial variation in paddy fields of Northwest Vietnam

et al. 2010

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“…Os elementos que ocorrem em maior proporção em todos os solos estudados são: silício (SiO 2 ), alumínio (Al 2 O 3 ), ferro (Fe 2 O 3 ), potássio (K 2 O), magnésio (MgO), titânio (TiO 2 ), cálcio (CaO), enxofre (SO 3 ) e fósforo (P 2 O 5 ) (Quadro 2); esses também são abundantes nos solos de várzea estudados por Prakongkep et al (2008), bem como por Furquim et al (2010) nos do Pantanal da Nhecolândia, MS. As concentrações médias de Al, Fe, Ti e Mg dos solos da RPPN são comparáveis a solos com condições ambientais semelhantes (Lee, 2006;Prakongkep et al, 2008;Furquim et al, 2010).…”

Section: Geoquímica Dos Elementos Maioresunclassified

Geoquímica de solos do pantanal norte, Mato Grosso

Coringa

Couto

Vidal‐Torrado

2014

Rev. Bras. Ciênc. Solo

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Torrado (4) RESUMOA caracterização e análise geoquímica de solos permitem compreender os processos de migração, dispersão e concentração de elementos químicos no perfil, embasando a correlação dos atributos deles com as classes de solos formadas, o que possibilita inferências acerca das gêneses desses solos. Esta pesquisa teve por objetivos caracterizar e interpretar a composição geoquímica total de elementos maiores e menores em classes de solos representativas do Pantanal norte, na sub-região de Barão de Melgaço, Mato Grosso, Brasil. Foram selecionados 20 perfis das principais classes de solos do Pantanal e analisadas amostras dos horizontes A e B (ou C) quanto à concentração de óxidos totais por espectrometria de fluorescência de raios-X, além das caracterizações física, química e mineralógica. Os solos subdividiram-se em dois tipos geoquímicos: um composto por textura arenosa a franco-arenosa com teores relativamente elevados de SiO 2 e predominância de caulinita e quartzo, com menor teor de bases e elementos-traço; e outro composto por textura mais argilosa, geoquimicamente heterogêneos e com teores significativos de minerais 2:1, Al 2 O 3 , óxidos de Fe e Mn, bases e elementos-traço.Termos de indexação: óxidos totais, solos hidromórficos, elementos-traço.

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“…Structural forms of heavy metals in soils is mainly attributed to isomorphic substitution in primary and secondary minerals, and their release into the soil solution involves a slow dissolution process (Prakongkep et al, 2008;Hayes et al, 2009). Some results of isomorphic substitution of Al, Fe, and Mg by heavy metals in minerals can be highlighted.…”

Section: Introductionmentioning

confidence: 99%

Identification of Heavy Metals in Crystals of Sand and Silt Fractions of Soils by Scanning Electron Microscopy (SEM EDS/WD-EPMA)

Batista

Melo

Gilkes

et al. 2018

Rev. Bras. Ciênc. Solo

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Studies of heavy metals are concentrate on clay fractions, but coarser fractions of the soil can constitute significant sources of structural forms of heavy metals. The aim of this study was to evaluate the occurrence of heavy metals in the structure of minerals of the sand and silt fractions of soils from three different parent materials (metamorphic rocks and granite) in southern Brazil using SEM/EDS -Scanning Electron Microscopy with Energy Dispersive Spectroscopy and with WD-EPMA -with Wavelength Dispersive-Electron Probe Microanalysis. We sampled soils from two areas naturally rich in heavy metals, with high mineral deposits (galena -PbS) hosted in carbonate rocks and phyllite/mica schist. The main form of Ba in the sand and silt fractions was as barite (BaSO 4 ). The precipitation of Ba and S from the soil solution occurred on the surface of silicate mineral particles. Due to the proximity of ionic radius of Ba-Pb, there was isomorphic substitution of Ba for Pb in the barite structure. The only primary mineral source of Pb in the coarse soil fractions was trioctahedral mica. Several secondary minerals in the silt and sand are sources of structural Pb: plumbogummite, plumboferrite, magnetoplumbite, and cerussite. There was a strong geochemical association of Pb-Fe-Mn. Zinc was also associated with Fe. The SEM/EDS/WD-EPMA techniques are important analyses to complement standard procedures, such as X-ray diffraction and total chemical digestion, in geochemical studies.

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The geochemistry of Thai paddy soils

Cited by 43 publications

References 31 publications

Sediment induced soil spatial variation in paddy fields of Northwest Vietnam

Sediment induced soil spatial variation in paddy fields of Northwest Vietnam

Geoquímica de solos do pantanal norte, Mato Grosso

Identification of Heavy Metals in Crystals of Sand and Silt Fractions of Soils by Scanning Electron Microscopy (SEM EDS/WD-EPMA)

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