Cadmium sorption and extractability in tropical soils with variable charge

Autor(es)

Colzato, Marina ^[1] ; Ferracciu Alleoni, Luis Reynaldo ^[1] ; Kamogawa, Marcos Yassuo ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Coll Agr Luiz de Queiroz, Av Padua Dias 11, BR-13418900 Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ENVIRONMENTAL MONITORING AND ASSESSMENT; v. 190, n. 6 JUN 2018.
• Citações Web of Science: 2

Resumo

The availability of cadmium (Cd) for plants and its impact in the environment depends on Cd sorption in soil colloids. The study of Cd sorption in soil and its fractionation is an interesting tool for the evaluation of Cd affinity with soil pools. The objective with this study was to evaluate Cd sorption and desorption in tropical soils with variable charge (three Oxisols), in a Mollisol and in two Entisols with diverse physical, chemical, and mineralogical attributes. We used a thermodynamic approach to evaluate Cd sorption and performed a chemical fractionation of Cd in the six soils. Data from Cd sorption fit the Langmuir model (r > 0.94), and the sorption capacity ranged from 0.33 to 11.5 mmol kg(-1). The Gibbs standard free energy was positively correlated to Cd sorption capacity (r = 0.74, except for the Quartzipsamments), and it was more favorable in soils with great sorption capacity. Distribution of Cd among fractions was not affected (t test, alpha = 0.05) by initial concentration, and there was a predominance of Cd extractable in 0.1 mol L-1 CaCl2. (AU)

• Processo FAPESP: 11/19944-3 - Uso de agregados de resíduos de construção e demolição como substratos para plantas
• Beneficiário: Marcos Yassuo Kamogawa
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/08205-8 - Estratégias de amostragem in situ dos macronutrientes e micronutrientes do solo
• Beneficiário: Marcos Yassuo Kamogawa
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 11/23498-9 - Sistemas avançados de análises químicas em fluxo: aplicações nas áreas tecnológica, agronômica e ambiental
• Beneficiário: Elias Ayres Guidetti Zagatto
• Modalidade de apoio: Auxílio à Pesquisa - Temático