Local coordination of Zn in hydroxy-interlayered minerals and implications for Zn retention in soils

Soil properties controlling Zn speciation and fractionation in contaminated soils

“…Details on most synthesis procedures have previously been reported Voegelin et al, 2005;Jacquat et al, 2008;Jacquat et al, 2009). Zn-sorbed talc was prepared by adding 200 mg talc (Sigma-Aldrich, Nr.…”

“…1). In HIM with low Zn loadings, Zn is mainly incorporated in the dioctahedral vacancies of Al-hydroxy-polymers (with 6 Al atoms in the second shell), giving rise to a pronounced splitting of the first oscillation at 3.8 Å À1 Schlegel and Manceau, 2007;Jacquat et al, 2009 (Tables 3 and 4). 2009).…”

“…In a first step, Zn K-edge EXAFS spectra from all soils were analyzed simultaneously using principle component analysis (PCA), followed by target transform testing (TT), and linear combination fitting (LCF) based on a large set of Zn reference spectra. We previously investigated two subsets of these soils with respect to Zn speciation in five calcareous and eight (mostly acidic) HIM-containing soils (Jacquat et al, 2009). In a second step, we investigated how Zn speciation in this wide range of soils related to soil properties and Zn content.…”

Microchemical contaminants as forming agents of anthropogenic soils

“…The interaction of Zn with hydroxyaluminum and hydroxyaluminum-smectite complex was studied by EXAFS analysis (Jacquat et al 2009). The authors showed that Zn is octahedrally coordinated with oxygen at 2.06-2.08 Å , and surrounded by Al atoms at 3.03-3.06 Å in the second shell with increasing molar Zn/ hydroxyaluminum ratio.…”

Purification of Waste Water Using Alumina as Catalysts Support and as an Adsorbent

“…Pauliac and Clause (1993) have reported on the formation of zinc-aluminum co-precipitates when 5 g ofalumina was in contact with 0.01 mol/L Zn(NO 3 ) 2 (200 mL) for 3 h at near-neutral pH (6.5 < pH < 8.5). Jacquat et al (2009) determined the local coordination of Zn in hydroxylinterlayered smectite (HIS) as a function of Zn loading. They observed a progressive shift from Zn incorporation in the vacancies of gibbsitic Al-polymers to Zn adsorption to incomplete Al-polymers and finally uptake by cation exchange in the polymer-free interlayer space of HIS with increasing Zn loading.…”