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Chemical speciation of aluminum in soil solution by nuclear magnetic resonance spectroscopy (27Al-NMR)

Grant number: 14/08768-8
Support type:Scholarships abroad - Research Internship - Master's degree
Effective date (Start): July 03, 2014
Effective date (End): December 15, 2014
Field of knowledge:Agronomical Sciences - Agronomy - Soil Science
Principal researcher:Luís Reynaldo Ferracciú Alleoni
Grantee:João Arthur Antonangelo
Supervisor abroad: Stephen D. Kinrade
Home Institution: Escola Superior de Agricultura Luiz de Queiroz (ESALQ). Universidade de São Paulo (USP). Piracicaba , SP, Brazil
Research place: Lakehead University, Canada  
Associated to the scholarship:13/18694-9 - Forms of silicon in an oxisol under no till system in function of surface application of calcium-magnesium silicate in experiment of long duration, BP.MS


Aluminum is the most abundant metal in the soil. In addition to being a toxic element to plants, Al3+ may also serve as an indicator of silicon content in the soil. In soils found in a humid tropical climate, the clay minerals, specifically aluminum oxides, tend to adsorb silicic acid (H4SiO4) strongly. At low pH values, a great amount of Al3+ is released by the oxides during the weathering process and is absorbed by plants. Surface application of correctives in the soil such as lime and calcium-magnesium silicate, tend to correct the pH, thereby reducing the concentration of Al3+ and increasing the availability of Si in the solution. Adoption of No-till farming techniques (NT) ensures the maintenance of organic matter as surface mulch. Thus, organic acids tend to complex Al3+ in solution, thereby decreasing its toxicity withing the surface soil layers. Consequently, the speciation of aluminum becomes an important factor, since aluminum toxicity depends on its chemical forms in the soil solution. Non-destructive analysis such as nuclear magnetic resonance spectroscopy (NMR) may identify the aluminum species present. Seeking to unite the benefits of surface application of correctives with the adoption of NT, this project aims to obtain the chemical species of Al in the soil solution through 27Al NMR (liquid-state) and correlate the results with the contents of available silicon and the soil chemical properties. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
ANTONANGELO, JOAO ARTHUR; NETO, JAYME FERRARI; COSTA CRUSCIOL, CARLOS ALEXANDRE; ZHANG, HAILIN; ALLEONI, LUIS REYNALDO F.; KINRADE, STEPHEN D.. Comparative analysis of exchangeable aluminum in a tropical soil under long-term no-till cultivation. SOIL & TILLAGE RESEARCH, v. 216, . (13/18594-4, 13/18694-9, 11/10566-6, 13/02000-8, 14/08768-8)

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