The Influence of Lattice Ions on the Electrokinetic Potential of Primary and Secondary Phosphates

Zeta potential measurements of apatite, wavellite, senegalite, and turquoise with inert and non-inert electrolytes were conducted. Sodium nitrate seems not to be an inert electrolyte with respect to fluorapatite because the increase in the nitrate concentration renders the zeta potential more negati...

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Bibliographic Details
Published in:Separation science and technology 2015-09, Vol.50 (13), p.2023-2031
Main Authors: Nunes, Aline Pereira Leite, Peres, Antônio Edwardo Clark, Valadão, George Eduardo Sales
Format: Article
Language:English
Subjects:
Apatite
Composing
Crystal structure
electrokinetic potential
Electrokinetics
Electrolytes
Hydrolysis
Inert
senegalite
turquoise
wavellite
Zeta potential
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Summary:Zeta potential measurements of apatite, wavellite, senegalite, and turquoise with inert and non-inert electrolytes were conducted. Sodium nitrate seems not to be an inert electrolyte with respect to fluorapatite because the increase in the nitrate concentration renders the zeta potential more negative, indicating ion-specificity towards apatite. Wavellite's pH IEP was achieved at 5.2, while the pH IEP values for senegalite and turquoise were determined at 6.2 and 7.2, respectively. The preferential hydrolysis of cations and the decrease in the number of water molecules composing the crystal structure are the most probable explanation of the increment in the IEP values (IEPwavellite
ISSN:0149-6395
1520-5754
DOI:10.1080/01496395.2015.1004347