The Release of Silicon, Aluminum, and Potassium During Decomposition of Soil Minerals by Humic Acid1

Tan, Keqin

doi:10.1097/00010694-198001000-00002

Cited by 70 publications

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“…Similarly, earlier work reports that weathering rates in pine rhizospheric soil subjected to small organic acid exudates may be significantly higher than in the bulk soil, where humic compounds predominate (Leyval and Berthelin, 1991). The role attributed to humic acids in mineral weathering has evolved considerably (Tan, 1980;McKeague and others, 1986;Berner, 1992;Blaser, 1994;Ochs, 1996, and references therein). The present work supports the emerging view that small organic compounds play a more important role of humic compounds in mineral dissolution.…”

mentioning

confidence: 99%

Biogenic dissolution of a soil cerium-phosphate mineral

Cervini-Silva¹,

Fowle²,

Banfield³

2005

American Journal of Science

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confidence: 99%

Biogenic dissolution of a soil cerium-phosphate mineral

Cervini-Silva¹,

Fowle²,

Banfield³

2005

American Journal of Science

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“…Therefore, it was more difficult for the stable muscovite to release K than for the microcline. The ease of mineral decomposition by humic compounds was also in the same order: biotite > K-feldspar > muscovite (Tan 1980). Compared with the microcline system, the muscovite system had higher values for both activation energy and preexponential factor of K release (Table 3).…”

Section: Kinetics Of Monoammonium Phosphate-induced K Release In Relamentioning

confidence: 86%

“…The influence of different types of organic acids on weathering of micas, feldspars, and rocks has been studied Keller 1970, 1972;Huang and Kiang 1972;Tan 1980Tan , 1986Berthelin 1983;Robert and Berthelin 1986;Sadusky et al 1987;. Song and Huang (1988) investigated the dynamics of K release from biotite, muscovite, microcline and orthoclase as influenced by oxalic and citric acids; they used the first-order rate equation to describe the release of K. They reported that the organic ligands play a very important role in influencing the rate of K release.…”

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confidence: 99%

Kinetics and mechanisms of monoammonium phosphate-induced potassium release from selected potassium-bearing minerals

Zhou¹,

Huang²

2006

Can. J. Soil. Sci.

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Zhou, J. M. and Huang, P. M. 2006. Kinetics and mechanisms of monoammonium phosphate-induced potassium release from selected potassium-bearing minerals. Can. J. Soil Sci. 86: 799-811. A high concentration of phosphate in the immediate vicinity of the phosphate fertilizer zone of soil could induce K release from K-bearing minerals to soil solution. In this study, the kinetics of K release by monoammonium phosphate (NH 4 H 2 PO 4 ) from biotite, muscovite, and microcline were investigated. The results indicate that K release from all of these minerals was promoted by 1 M NH 4 H 2 PO 4 (pH 4.0). The release of K from these minerals can be described by the zero-order rate equation. The rate coefficients of K released from the minerals (2-5 µm) in 1 M NH 4 H 2 PO 4 solution ranged from 0.20 to 2.09 mg kg -1 h -1 at 25°C and from 1.22 to 9.00 mg kg -1 h -1 at 45°C, respectively. The amount of K release from the same mineral samples in 1 M NH 4 Cl solution (pH 4.0) at 25°C was not detectable and was too low to be determined accurately at 45°C. The differences in the rate of NH 4 H 2 PO 4 -induced K release from the different minerals were explained by the chemical composition, crystal structure, and the crystallization sequence of the minerals. The activation energies of the phosphate-induced K release from these minerals ranged from 37 to 72 kJ mol -1 and the pre-exponential factor values (Arrhenius equation) ranged from 1.2 × 10 6 to 7.2 × 10 11 mg kg -1 h -1 . The examination of the phosphate-reacted minerals shows the formation of crystalline NH 4 -taranakite in the muscovite and microcline systems and noncrystalline products in the biotite system. The absence of the formation of crystalline NH 4 -taranakite in the biotite system is attributed to the Fe perturbation. These data indicate that the major mechanism of NH 4 H 2 PO 4 -induced K release from the K-bearing minerals was the combined effect of phosphate and protons on the alteration of minerals. Therefore, the K-supplying rate of soils in the immediate vicinity of fertilizer zones may be enhanced through phosphate fertilization. . Une concentration élevée de phosphate à proximité immédiate de la zone où l'on dépose les engrais phosphatés pourrait déclencher la libération de potassium des minéraux qui en renferment dans la solution de sol. Dans le cadre de cette étude, les auteurs ont examiné la cinétique d'une telle libération, engendrée par du phosphate d'ammonium diacide (NH 4 H 2 PO 4 ) dans de la biotite, de la muscovite et de la microcline. Les résultats indiquent que le NH 4 H 2 PO 4 1 M (pH 4,0) libère du K de ces minéraux. On peut décrire ce phénomène au moyen d'une équation d'ordre zéro exprimant le taux de libération. Les coefficients du taux de libération du K par ces minéraux (2 à 5 µm) dans une solution de NH 4 H 2 PO 4 1 M varient de 0,20 à 2,09 mg par kg et par heure à 25°C et de 1,22 à 9,00 mg par kg et par heure à 45°C, respectivement. La quantité de K libérée par les mêmes échantillons dans la solution de NH 4 H 2 PO 4 1 M (pH 4,0) à 25°C n...

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“…A efetividade da dissolução de minerais por via bioquímica depende, em última análise, da interação de pH e natureza do ácido orgânico envolvido quanto à capacidade de complexação (disponibilidade de ligantes orgânicos extracelulares) e solubilidade em água (Tan, 1980;Stone, 1998). Conforme Stone (1998), embora os mecanismos de formação de complexos organominerais tenham papel importante na dinâmica dos íons metálicos em ambientes naturais, seu entendimento é ainda bastante limitado.…”

Section: Introductionunclassified

Crostas biológicas em saprolitos de gnaisse: ciclagem biogeoquímica, micromorfologia e ensaio de colonização

Trindade

Schaefer²,

Albuquerque

et al. 2001

Rev. Bras. Ciênc. Solo

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RESUMOO papel biogeoquímico e estrutural das crostas microbióticas é praticamente desconhecido, embora estas sejam freqüentes na superfície de taludes naturais e antrópicos expostos em domínio tropical úmido. O presente trabalho teve como objetivo estudar as interações envolvidas no intemperismo biogeoquímico decorrente da ação de microrganismos e plantas inferiores na superfície de saprolitos gnáissicos expostos em taludes da Zona da Mata de Minas Gerais. Foram investigados também os efeitos das associações organominerais na formação e estabilização estrutural de agregados, bem como as feições micropedológicas das diferentes crostas e do substrato sob influência destas. Fez-se o isolamento de cianobactérias, objetivando uma visão preliminar da viabilidade de obtenção de inóculo em laboratório, para posterior utilização na estabilização de superfícies minerais expostas. O grau de intemperismo e o caráter máfico ou félsico dos substratos foram determinantes no comportamento dos organismos em relação à ciclagem biogeoquímica, influenciando os valores de pH, a atividade de argila e o caráter eutrófico ou distrófico das crostas e saprolitos. Em geral, observou-se concentração de K e Al trocáveis na crosta, sendo K o elemento mais consistentemente associado à ciclagem biogeoquímica. O mesmo ocorreu em relação a Ca e Mg trocáveis, exceto nos saprolitos mais máficos, onde sua abundância mascarou a ciclagem biogeoquímica. As crostas tenderam também a concentrar P, Mn, Pb e Ni disponíveis, em todos os pontos, embora a contribuição de poluentes atmosféricos, no caso de Pb, possa estar mascarando os efeitos da atividade microbiana na mobilidade deste elemento.

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The Release of Silicon, Aluminum, and Potassium During Decomposition of Soil Minerals by Humic Acid1

Cited by 70 publications

References 0 publications

Biogenic dissolution of a soil cerium-phosphate mineral

Biogenic dissolution of a soil cerium-phosphate mineral

Kinetics and mechanisms of monoammonium phosphate-induced potassium release from selected potassium-bearing minerals

Crostas biológicas em saprolitos de gnaisse: ciclagem biogeoquímica, micromorfologia e ensaio de colonização

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