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231224s2013 xx |||||o 00| ||eng c |
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|a 10.1021/la401318t
|2 doi
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|a eng
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|a Kozin, Philipp A
|e verfasserin
|4 aut
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|a Electrolyte ion binding at iron oxyhydroxide mineral surfaces
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|c 2013
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|a Text
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|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Completed 29.04.2014
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|a Date Revised 01.10.2013
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a Electrolyte ion loadings at the surfaces of synthetic goethite (α-FeOOH) and lepidocrocite (γ-FeOOH) particles that were pre-equilibrated in aqueous solutions of 10 mM NaCl and NaClO4 at 25 °C were investigated by cryogenic X-ray photoelectron spectroscopy (XPS). Atomic concentrations of Cl(-), ClO4(-), and Na(+) were correlated to potential determining ion (pdi; H(+), OH(-)) loadings obtained by potentiometric titrations. While Cl(-) promoted more pdi adsorption than ClO4(-), due to its greater charge-to-size ratio, both ions followed the same loading dependence on pdi adsorption, in contrast to previous studies supporting the concept for negligible perchlorate adorption. Lepidocrocite particles exhibited a stronger response of electrolyte adsorption to pdi loadings due electrolyte ion adsorption on the proton inactive (010) plane. These particles also acquired greater sodium loadings than goethite. These loadings were moreover considerably enhanced by perchlorate adsorption, possibly due to a thickening of the interfacial region in NaClO4 on the (010) plane. Finally, goethite particles with rougher surfaces acquired greater pdi and ion loadings than on those with smoother surfaces. No strong differences could be discerned between Cl(-) and ClO4(-) loadings on these materials. This work thus identified key aspects underpinning the relationship between pdi and electrolyte loadings at FeOOH mineral surfaces of environmental and technological importance
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Shchukarev, Andrey
|e verfasserin
|4 aut
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1 |
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|a Boily, Jean-François
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1985
|g 29(2013), 39 vom: 01. Okt., Seite 12129-37
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnas
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| 773 |
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|g volume:29
|g year:2013
|g number:39
|g day:01
|g month:10
|g pages:12129-37
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|u http://dx.doi.org/10.1021/la401318t
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