Influence of Fluoride Addition on the Composition of Solutions in Equilibrium with Acid Soils

作     者：A. ROMAR C. GAGO M. L. FERNNDEZ-MARCOS E. LVAREZ 

作者机构：Departamento de Edafología y Química Agrícola University of Santiago de Compostela Campus Universitario 27002 Lugo (Spain) 

出 版 物：《Pedosphere》 (土壤圈（英文版）)

年 卷 期：2009年第19卷第1期

页      面：60-70页

核心收录：

学科分类：09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学] 

基　　金：supported by the National Programme for Research and Development  Spanish Ministry of Science (No.AMB97-1062) 

主　　题：aluminium speciation equilibrium soil solution fluoride pollution 

摘      要：Atmospheric emissions of fluoride from an aiuminium smelter-alumina refinery located on the northern coast of Galicia, NW Spain, increase the content of fluorine in soils and vegetation in the vicinity of the complex. The effects of the addition of fluoride solutions on the chemical properties of soil samples from the area surrounding the complex were investigated in laboratory experiments. Addition of fluoride to soils resulted in increases in pH and concentrations of Fe, A1, and organic matter in the equilibrium solutions and decreases in concentrations of Ca, Mg, and K. No consistent effects were observed on the Cu, Mn, or Zn concentrations. Most of the A1 in solution was bound to organic matter. Within the fraction ＂labile aluminium＇, the concentration of A1-OH complexes decreased and the A1-F complexes increased, especially A1F3 and A1F4^-, which are less toxic than Al^3＋ and A1-OH species.