Individual anionic adsorption and desorption by pedogenic gibbsite

Quimica nova

Motta, Paulo E. F.¹  Martins, Rodrigo S.²  Costa, Enio T. S.³  Curi, Nilton³  Zuliani, Daniela Q.³  Pozza, Adélia A. A.³  Guilherme, Luiz R. G.³  Oliveira, Luiz C. A.³  Marques, João J. G. S. M.³ 

[1]Embrapa Solos, Rio de Janeiro, Brasil

[2]Heringer, Paraná, Brasil

[3]Universidade Federal de Lavras, Lavras, Brasil

关键词: retention;    anions;    Al-hydroxide.;   

DOI  :  10.1590/S0100-40422009000100019

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

Anion adsorption/desorption dynamics was studied as individual processes on surface of particles of a gibbsitic clay. The data suggest a remarkable gibbsite role as nitrate leaching retardant in soil. The opposite behavior of gibbsite towards adsorption/desorption of silicate and phosphate suggests the need of an adequate compromise solution regarding interval and rate applications of anions in cultivated gibbsitic soils. The high P adsorption verified in pH values lower than that reported for the point of zero charge of synthetic Al-hydroxides implies that this process takes place in pedogenic gibbsites through inner sphere complexation.

【 授权许可】

CC BY