Feldspar-Fluoride interactions: examination of interfacial processes by potentiometry
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Date
2008
Authors
Fernando, W. J. G. S. P. S.
Journal Title
Journal ISSN
Volume Title
Publisher
University of Peradeniya
Abstract
Fluoride is biological active marginal harmful element that required 0.8 ppm in water to exhaust beneficial effect on human health in Sri Lanka.
In this research, the feldspar and fluoride surface interaction were examined mechanistically experimental condition that are important from environmental view point.
The pH pzc of feldspar was pH 3.5 — pH 4.0 is found by > AIOH and > SiOH surface site and exhausting a domain by > SiOH. The surface of feldspar consists of uneven distribute of > SiOH and > AIOH site. Specific surface area was determined by methylene blue adsorption method is 9.791 m² g⁻¹
Fluoride adsorption by feldspar is a rapid process reaching an apparently plateau within 20 min stirring time and 2.0 h equilibrium time.
The X- Ray diffraction (XRD) data confirm aluminium leached out as dominant mineral phase in feldspar. When feldspar is reacted with fluoride, there is an apparent change in XRD patterns.
There is no difference in data between convention fluoride determination and in-situ fluoride determination.
The results showed that feldspar which was obtained from Matale, Cations leached in the presence of fluoride and there were complexes of fluoride formation at low pH values.
Description
Keywords
Chemical sciences , Analytical chemistry