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

Pedosphere 2009年第1期19卷 60-70页

作者： A. ROMAR C. GAGO M. L. FERNNDEZ-MARCOS E. LVAREZ Departamento de Edafología y Química Agrícola University of Santiago de Compostela Campus Universitario 27002 Lugo (Spain)

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.

关键词： aluminium speciation equilibrium soil solution fluoride pollution

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Research on fluoride Concentration in the Atmosphere in Spring and Winter of Baoding City

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Meteorological and Environmental Research 2013年第10期4卷 34-36页

作者： Jie Liu Zhanchen Li Shuangshuang Ge College of Chemistry and Environmental Science Hebei University

[ Objective] The study aimed to discuss air pollution by fluoride in spring and winter of Baoding City. [Method] Using fluor reagent spec- trophotometry, fluoride concentration in the atmosphere in spring and winter of Baoding City was detection, and its air pollution by fluoride was assessed. [ Result ] In winter, atmospheric fluoride concentration in Baoding City was 0.009 -0.052μg/L, and the average detected rate of atmospheric fluoride concentration in the campus of Hebei University was 80%, In spring, atmospheric fluoride concentration was 0. 018 -0. 059 μg/L, and the detected rate was 94%. Compared with winter, air ＇pollution by fluoride was more serious in spring. During a day, the peaks of fluoride concentration in the atmosphere appeared from 10：00 to 11：00 or at 14：00. A rain could reduce fluoride concentration in the atmosphere and make the air clean. [Condusion] The research could provide scientific references for the effective control of air pollution by fluoride in Baoding City.

关键词： Air fluoride pollution Seasonal variation Baoding China

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