The mechanisms of Zn uptake in dilute suspensions ( 2gL -1 )o f hectorite were investigated by ki... more The mechanisms of Zn uptake in dilute suspensions ( 2gL -1 )o f hectorite were investigated by kinetics experiments and extended X-ray absorption fine structure (EXAFS) spectroscopy on wet pastes and self-supporting films of Zn-sorbed hectorite. Kinetics experiments were performed at pH 4 and 6.5, in 0.3 and 0.01 M NaNO3, and with a total Zn concentration of 100 M.
The molecular environment of iodine in reference inorganic and organic compounds, and in dry humi... more The molecular environment of iodine in reference inorganic and organic compounds, and in dry humic and fulvic acids (HAs and FAs) extracted from subsurface and deep aquifers was probed by iodine L3-edge X-ray absorption spectroscopy. The X-ray absorption near-edge structure (XANES) of iodine spectra from HAs and FAs resembled those of organic references and displayed structural features consistent with iodine
Zinc uptake in suspensions (⩽3.7gL−1) of MX80 montmorillonite was investigated at pH 4.0 and 7.3,... more Zinc uptake in suspensions (⩽3.7gL−1) of MX80 montmorillonite was investigated at pH 4.0 and 7.3, a total Zn concentration ([Zn]total) of 500μM, and dissolved Si concentrations ([Si]aq) of ∼70 and ∼500μM in 0.5M NaCl, by kinetics experiments and polarized extended X-ray absorption fine structure (P-EXAFS) spectroscopy. Differential thermogravimetric analysis verified the cis-vacant character of the montmorillonite. No Zn uptake occurred
The impact of dissolved Si ([Si]aq) on Zn uptake in dilute suspensions (0.65 g/L) of hectorite wa... more The impact of dissolved Si ([Si]aq) on Zn uptake in dilute suspensions (0.65 g/L) of hectorite was investigated at pH 7.30, a total Zn concentration (TotZn) of 520 μM, and ionic strength of 0.3 M (NaNO3 salt) by kinetics experiments and polarized extended X-ray absorption fine structure (P-EXAFS) spectroscopy.At low [Si]aq (∼30 to 60 μM), 5.8% of TotZn was adsorbed
The crystal chemistry of Cr (0.73%), Mn (0.88%), Co (0.166%), Ni (0.898%), Cu (0.263%), and Zn (0... more The crystal chemistry of Cr (0.73%), Mn (0.88%), Co (0.166%), Ni (0.898%), Cu (0.263%), and Zn (0.026%) in natural goethite (αFeOOH) from an earthy saprolite formation in West-Africa was investigated by fluorescence-yield extended X-ray absorption fine structure (EXAFS) spectroscopy. Synthetic goethites and phyllomanganates were used as model compounds for structural determinations. The measurement of EXAFS spectra at energies higher than
More than a century of non-ferrous metallurgical activities have had a severe impact on the natur... more More than a century of non-ferrous metallurgical activities have had a severe impact on the natural environment leading, in most heavily contaminated sites, to a complete loss of the vegetation cover (that is, desert-like areas) or to the selection of metal-hyperaccumulator plant species. Identifying the chemical forms of toxic metals is of vital importance for a realistic assessment of the
The mechanisms of Zn uptake in dilute suspensions ( 2gL -1 )o f hectorite were investigated by ki... more The mechanisms of Zn uptake in dilute suspensions ( 2gL -1 )o f hectorite were investigated by kinetics experiments and extended X-ray absorption fine structure (EXAFS) spectroscopy on wet pastes and self-supporting films of Zn-sorbed hectorite. Kinetics experiments were performed at pH 4 and 6.5, in 0.3 and 0.01 M NaNO3, and with a total Zn concentration of 100 M.
The molecular environment of iodine in reference inorganic and organic compounds, and in dry humi... more The molecular environment of iodine in reference inorganic and organic compounds, and in dry humic and fulvic acids (HAs and FAs) extracted from subsurface and deep aquifers was probed by iodine L3-edge X-ray absorption spectroscopy. The X-ray absorption near-edge structure (XANES) of iodine spectra from HAs and FAs resembled those of organic references and displayed structural features consistent with iodine
Zinc uptake in suspensions (⩽3.7gL−1) of MX80 montmorillonite was investigated at pH 4.0 and 7.3,... more Zinc uptake in suspensions (⩽3.7gL−1) of MX80 montmorillonite was investigated at pH 4.0 and 7.3, a total Zn concentration ([Zn]total) of 500μM, and dissolved Si concentrations ([Si]aq) of ∼70 and ∼500μM in 0.5M NaCl, by kinetics experiments and polarized extended X-ray absorption fine structure (P-EXAFS) spectroscopy. Differential thermogravimetric analysis verified the cis-vacant character of the montmorillonite. No Zn uptake occurred
The impact of dissolved Si ([Si]aq) on Zn uptake in dilute suspensions (0.65 g/L) of hectorite wa... more The impact of dissolved Si ([Si]aq) on Zn uptake in dilute suspensions (0.65 g/L) of hectorite was investigated at pH 7.30, a total Zn concentration (TotZn) of 520 μM, and ionic strength of 0.3 M (NaNO3 salt) by kinetics experiments and polarized extended X-ray absorption fine structure (P-EXAFS) spectroscopy.At low [Si]aq (∼30 to 60 μM), 5.8% of TotZn was adsorbed
The crystal chemistry of Cr (0.73%), Mn (0.88%), Co (0.166%), Ni (0.898%), Cu (0.263%), and Zn (0... more The crystal chemistry of Cr (0.73%), Mn (0.88%), Co (0.166%), Ni (0.898%), Cu (0.263%), and Zn (0.026%) in natural goethite (αFeOOH) from an earthy saprolite formation in West-Africa was investigated by fluorescence-yield extended X-ray absorption fine structure (EXAFS) spectroscopy. Synthetic goethites and phyllomanganates were used as model compounds for structural determinations. The measurement of EXAFS spectra at energies higher than
More than a century of non-ferrous metallurgical activities have had a severe impact on the natur... more More than a century of non-ferrous metallurgical activities have had a severe impact on the natural environment leading, in most heavily contaminated sites, to a complete loss of the vegetation cover (that is, desert-like areas) or to the selection of metal-hyperaccumulator plant species. Identifying the chemical forms of toxic metals is of vital importance for a realistic assessment of the
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