The Experts below are selected from a list of 3990 Experts worldwide ranked by ideXlab platform
Barbara Etschmann - One of the best experts on this subject based on the ideXlab platform.
-
an in situ xas study of copper i transport as Hydrosulfide complexes in hydrothermal solutions 25 592 c 180 600 bar speciation and solubility in vapor and liquid phases
Geochimica et Cosmochimica Acta, 2010Co-Authors: Barbara Etschmann, Weihua Liu, Denis Testemale, Harald Müller, N. A. Rae, Olivier Proux, J. L. Hazemann, Joël BruggerAbstract:Chloride and Hydrosulfide are the principal ligands assumed to govern transport of copper in hydrothermal fluids. Existing solubility experiments suggest that Cu(I)-Hydrosulfide complexes are dominant compared to chloride complexes at low salinities in alkaline solutions (H2S(aq)/HS- pH buffer), and may be important in transporting Cu in low density magmatic vapors, potentially controlling the liquid-vapor partitioning of Cu. This study provides the first in situ evidence of the solubility of copper sulfides and the nature and structure of the predominant Cu species in sulfur-containing fluids at temperatures up to 592 degrees C and pressures of 180-600 bar. XANES and EXAFS data show that at elevated T (<= 200 degrees C), Cu solubility occurs via a linear Cu complex. At 428 degrees C in alkaline solutions. Cu is coordinated by two sulfur atoms in a distorted linear coordination (angle similar to 150-160 degrees). This geometry is consistent with the species Cu(HS)(2)(-) predicted by earlier solubility studies. In addition, in situ measurements of the solubility of chalcocite in 2 in NaHS solutions performed in this study are in remarkably good agreement with the solubilities calculated using available thermodynamic data for Cu(I)-Hydrosulfide complexes, also supporting the interpretation of speciation in these studies and validating the extrapolation of low-T thermodynamic properties for Cu(HS)(2)(-) to high P-T. Data on phase separation for the 2 m NaHS solution show that while significant amounts of copper can be partitioned into the vapor phase, there is no indication for preferential partitioning of Cu into the vapor. This is consistent with recent partitioning experiments conducted in autoclaves by Pokrovski et al. (2008a) and Simon et al. (2006). XANES data suggest that the species present in the low density phase is very similar to that present in the high density liquid, i.e., Cu(HS)(2)(-), although Cu(HS)(H2S)(0) cannot be excluded on the basis of XAS data.
-
An in situ XAS study of copper(I) transport as Hydrosulfide complexes in hydrothermal solutions (25-592 degrees C, 180-600 bar): Speciation and solubility in vapor and liquid phases
Geochimica et Cosmochimica Acta, 2010Co-Authors: Barbara Etschmann, Weihua Liu, Denis Testemale, Olivier Proux, J. L. Hazemann, Harald Mueller, Nick Rae, Joël BruggerAbstract:Chloride and Hydrosulfide are the principal ligands assumed to govern transport of copper in hydrothermal fluids. Existing solubility experiments suggest that Cu(I)-Hydrosulfide complexes are dominant compared to chloride complexes at low salinities in alkaline solutions (H2S(aq)/HS- pH buffer), and may be important in transporting Cu in low density magmatic vapors, potentially controlling the liquid-vapor partitioning of Cu. This study provides the first in situ evidence of the solubility of copper sulfides and the nature and structure of the predominant Cu species in sulfur-containing fluids at temperatures up to 592 degrees C and pressures of 180-600 bar. XANES and EXAFS data show that at elevated T (
-
An in situ XAS study of copper(I) transport as Hydrosulfide complexes in hydrothermal solutions (25–592 °C, 180–600 bar): Speciation and solubility in vapor and liquid phases
Geochimica et Cosmochimica Acta, 2010Co-Authors: Barbara Etschmann, Weihua Liu, Denis Testemale, Harald Müller, N. A. Rae, Olivier Proux, J. L. Hazemann, Joël BruggerAbstract:Chloride and Hydrosulfide are the principal ligands assumed to govern transport of copper in hydrothermal fluids. Existing solubility experiments suggest that Cu(I)-Hydrosulfide complexes are dominant compared to chloride complexes at low salinities in alkaline solutions (H2S(aq)/HS- pH buffer), and may be important in transporting Cu in low density magmatic vapors, potentially controlling the liquid-vapor partitioning of Cu. This study provides the first in situ evidence of the solubility of copper sulfides and the nature and structure of the predominant Cu species in sulfur-containing fluids at temperatures up to 592 degrees C and pressures of 180-600 bar. XANES and EXAFS data show that at elevated T (
Joël Brugger - One of the best experts on this subject based on the ideXlab platform.
-
an in situ xas study of copper i transport as Hydrosulfide complexes in hydrothermal solutions 25 592 c 180 600 bar speciation and solubility in vapor and liquid phases
Geochimica et Cosmochimica Acta, 2010Co-Authors: Barbara Etschmann, Weihua Liu, Denis Testemale, Harald Müller, N. A. Rae, Olivier Proux, J. L. Hazemann, Joël BruggerAbstract:Chloride and Hydrosulfide are the principal ligands assumed to govern transport of copper in hydrothermal fluids. Existing solubility experiments suggest that Cu(I)-Hydrosulfide complexes are dominant compared to chloride complexes at low salinities in alkaline solutions (H2S(aq)/HS- pH buffer), and may be important in transporting Cu in low density magmatic vapors, potentially controlling the liquid-vapor partitioning of Cu. This study provides the first in situ evidence of the solubility of copper sulfides and the nature and structure of the predominant Cu species in sulfur-containing fluids at temperatures up to 592 degrees C and pressures of 180-600 bar. XANES and EXAFS data show that at elevated T (<= 200 degrees C), Cu solubility occurs via a linear Cu complex. At 428 degrees C in alkaline solutions. Cu is coordinated by two sulfur atoms in a distorted linear coordination (angle similar to 150-160 degrees). This geometry is consistent with the species Cu(HS)(2)(-) predicted by earlier solubility studies. In addition, in situ measurements of the solubility of chalcocite in 2 in NaHS solutions performed in this study are in remarkably good agreement with the solubilities calculated using available thermodynamic data for Cu(I)-Hydrosulfide complexes, also supporting the interpretation of speciation in these studies and validating the extrapolation of low-T thermodynamic properties for Cu(HS)(2)(-) to high P-T. Data on phase separation for the 2 m NaHS solution show that while significant amounts of copper can be partitioned into the vapor phase, there is no indication for preferential partitioning of Cu into the vapor. This is consistent with recent partitioning experiments conducted in autoclaves by Pokrovski et al. (2008a) and Simon et al. (2006). XANES data suggest that the species present in the low density phase is very similar to that present in the high density liquid, i.e., Cu(HS)(2)(-), although Cu(HS)(H2S)(0) cannot be excluded on the basis of XAS data.
-
An in situ XAS study of copper(I) transport as Hydrosulfide complexes in hydrothermal solutions (25-592 degrees C, 180-600 bar): Speciation and solubility in vapor and liquid phases
Geochimica et Cosmochimica Acta, 2010Co-Authors: Barbara Etschmann, Weihua Liu, Denis Testemale, Olivier Proux, J. L. Hazemann, Harald Mueller, Nick Rae, Joël BruggerAbstract:Chloride and Hydrosulfide are the principal ligands assumed to govern transport of copper in hydrothermal fluids. Existing solubility experiments suggest that Cu(I)-Hydrosulfide complexes are dominant compared to chloride complexes at low salinities in alkaline solutions (H2S(aq)/HS- pH buffer), and may be important in transporting Cu in low density magmatic vapors, potentially controlling the liquid-vapor partitioning of Cu. This study provides the first in situ evidence of the solubility of copper sulfides and the nature and structure of the predominant Cu species in sulfur-containing fluids at temperatures up to 592 degrees C and pressures of 180-600 bar. XANES and EXAFS data show that at elevated T (
-
An in situ XAS study of copper(I) transport as Hydrosulfide complexes in hydrothermal solutions (25–592 °C, 180–600 bar): Speciation and solubility in vapor and liquid phases
Geochimica et Cosmochimica Acta, 2010Co-Authors: Barbara Etschmann, Weihua Liu, Denis Testemale, Harald Müller, N. A. Rae, Olivier Proux, J. L. Hazemann, Joël BruggerAbstract:Chloride and Hydrosulfide are the principal ligands assumed to govern transport of copper in hydrothermal fluids. Existing solubility experiments suggest that Cu(I)-Hydrosulfide complexes are dominant compared to chloride complexes at low salinities in alkaline solutions (H2S(aq)/HS- pH buffer), and may be important in transporting Cu in low density magmatic vapors, potentially controlling the liquid-vapor partitioning of Cu. This study provides the first in situ evidence of the solubility of copper sulfides and the nature and structure of the predominant Cu species in sulfur-containing fluids at temperatures up to 592 degrees C and pressures of 180-600 bar. XANES and EXAFS data show that at elevated T (
Wen-feng Liaw - One of the best experts on this subject based on the ideXlab platform.
-
Iron(III) Bound by Hydrosulfide Anion Ligands: NO-Promoted Stabilization of the [FeIII–SH] Motif
Journal of the American Chemical Society, 2014Co-Authors: Chih Chin Tsou, Wei Chun Chiu, Jia Chun Tsai, Yun-ming Wang, Ming-hsi Chiang, Wen-feng LiawAbstract:Spontaneous transformation of the thermally stable [HS]−-bound {Fe(NO)2}9 dinitrosyl iron complex (DNIC) [(HS)2Fe(NO)2]− (1) into [(NO)2Fe(μ-S)]22– (Roussin’s red salt (RRS)) along with release of H2S, probed by NBD-SCN (NBD = nitrobenzofurazan), was observed when DNIC 1 was dissolved in water at ambient temperature. The reversible transformation of RRS into DNIC 1 (RRS → DNIC 1) in the presence of H2S was demonstrated. In contrast, the thermally unstable Hydrosulfide-containing mononitrosyl iron complex (MNIC) [(HS)3FeIII(NO)]− (3) and [FeIII(SH)4]− (5) in THF/DMF spontaneously dimerized into the first structurally characterized FeIII–Hydrosulfide complexes [(NO)(SH)Fe(μ-S)]22– (4) with two {Fe(NO)}7 motifs antiferromagnetically coupled and [(SH)2Fe(μ-S)]22– (6) resulting from two FeIII (S = 5/2) centers antiferromagnetically coupled to yield an S = 0 ground state with thermal occupancy of higher spin states, respectively. That is, the greater the number of NO ligands bound to [2Fe2S], the larger the ant...
-
iron iii bound by Hydrosulfide anion ligands no promoted stabilization of the feiii sh motif
Journal of the American Chemical Society, 2014Co-Authors: Chih Chin Tsou, Wei Chun Chiu, Jia Chun Tsai, Yun-ming Wang, Ming-hsi Chiang, Wen-feng LiawAbstract:Spontaneous transformation of the thermally stable [HS]−-bound {Fe(NO)2}9 dinitrosyl iron complex (DNIC) [(HS)2Fe(NO)2]− (1) into [(NO)2Fe(μ-S)]22– (Roussin’s red salt (RRS)) along with release of H2S, probed by NBD-SCN (NBD = nitrobenzofurazan), was observed when DNIC 1 was dissolved in water at ambient temperature. The reversible transformation of RRS into DNIC 1 (RRS → DNIC 1) in the presence of H2S was demonstrated. In contrast, the thermally unstable Hydrosulfide-containing mononitrosyl iron complex (MNIC) [(HS)3FeIII(NO)]− (3) and [FeIII(SH)4]− (5) in THF/DMF spontaneously dimerized into the first structurally characterized FeIII–Hydrosulfide complexes [(NO)(SH)Fe(μ-S)]22– (4) with two {Fe(NO)}7 motifs antiferromagnetically coupled and [(SH)2Fe(μ-S)]22– (6) resulting from two FeIII (S = 5/2) centers antiferromagnetically coupled to yield an S = 0 ground state with thermal occupancy of higher spin states, respectively. That is, the greater the number of NO ligands bound to [2Fe2S], the larger the ant...
Olivier Proux - One of the best experts on this subject based on the ideXlab platform.
-
an in situ xas study of copper i transport as Hydrosulfide complexes in hydrothermal solutions 25 592 c 180 600 bar speciation and solubility in vapor and liquid phases
Geochimica et Cosmochimica Acta, 2010Co-Authors: Barbara Etschmann, Weihua Liu, Denis Testemale, Harald Müller, N. A. Rae, Olivier Proux, J. L. Hazemann, Joël BruggerAbstract:Chloride and Hydrosulfide are the principal ligands assumed to govern transport of copper in hydrothermal fluids. Existing solubility experiments suggest that Cu(I)-Hydrosulfide complexes are dominant compared to chloride complexes at low salinities in alkaline solutions (H2S(aq)/HS- pH buffer), and may be important in transporting Cu in low density magmatic vapors, potentially controlling the liquid-vapor partitioning of Cu. This study provides the first in situ evidence of the solubility of copper sulfides and the nature and structure of the predominant Cu species in sulfur-containing fluids at temperatures up to 592 degrees C and pressures of 180-600 bar. XANES and EXAFS data show that at elevated T (<= 200 degrees C), Cu solubility occurs via a linear Cu complex. At 428 degrees C in alkaline solutions. Cu is coordinated by two sulfur atoms in a distorted linear coordination (angle similar to 150-160 degrees). This geometry is consistent with the species Cu(HS)(2)(-) predicted by earlier solubility studies. In addition, in situ measurements of the solubility of chalcocite in 2 in NaHS solutions performed in this study are in remarkably good agreement with the solubilities calculated using available thermodynamic data for Cu(I)-Hydrosulfide complexes, also supporting the interpretation of speciation in these studies and validating the extrapolation of low-T thermodynamic properties for Cu(HS)(2)(-) to high P-T. Data on phase separation for the 2 m NaHS solution show that while significant amounts of copper can be partitioned into the vapor phase, there is no indication for preferential partitioning of Cu into the vapor. This is consistent with recent partitioning experiments conducted in autoclaves by Pokrovski et al. (2008a) and Simon et al. (2006). XANES data suggest that the species present in the low density phase is very similar to that present in the high density liquid, i.e., Cu(HS)(2)(-), although Cu(HS)(H2S)(0) cannot be excluded on the basis of XAS data.
-
An in situ XAS study of copper(I) transport as Hydrosulfide complexes in hydrothermal solutions (25-592 degrees C, 180-600 bar): Speciation and solubility in vapor and liquid phases
Geochimica et Cosmochimica Acta, 2010Co-Authors: Barbara Etschmann, Weihua Liu, Denis Testemale, Olivier Proux, J. L. Hazemann, Harald Mueller, Nick Rae, Joël BruggerAbstract:Chloride and Hydrosulfide are the principal ligands assumed to govern transport of copper in hydrothermal fluids. Existing solubility experiments suggest that Cu(I)-Hydrosulfide complexes are dominant compared to chloride complexes at low salinities in alkaline solutions (H2S(aq)/HS- pH buffer), and may be important in transporting Cu in low density magmatic vapors, potentially controlling the liquid-vapor partitioning of Cu. This study provides the first in situ evidence of the solubility of copper sulfides and the nature and structure of the predominant Cu species in sulfur-containing fluids at temperatures up to 592 degrees C and pressures of 180-600 bar. XANES and EXAFS data show that at elevated T (
-
An in situ XAS study of copper(I) transport as Hydrosulfide complexes in hydrothermal solutions (25–592 °C, 180–600 bar): Speciation and solubility in vapor and liquid phases
Geochimica et Cosmochimica Acta, 2010Co-Authors: Barbara Etschmann, Weihua Liu, Denis Testemale, Harald Müller, N. A. Rae, Olivier Proux, J. L. Hazemann, Joël BruggerAbstract:Chloride and Hydrosulfide are the principal ligands assumed to govern transport of copper in hydrothermal fluids. Existing solubility experiments suggest that Cu(I)-Hydrosulfide complexes are dominant compared to chloride complexes at low salinities in alkaline solutions (H2S(aq)/HS- pH buffer), and may be important in transporting Cu in low density magmatic vapors, potentially controlling the liquid-vapor partitioning of Cu. This study provides the first in situ evidence of the solubility of copper sulfides and the nature and structure of the predominant Cu species in sulfur-containing fluids at temperatures up to 592 degrees C and pressures of 180-600 bar. XANES and EXAFS data show that at elevated T (
Weihua Liu - One of the best experts on this subject based on the ideXlab platform.
-
an in situ xas study of copper i transport as Hydrosulfide complexes in hydrothermal solutions 25 592 c 180 600 bar speciation and solubility in vapor and liquid phases
Geochimica et Cosmochimica Acta, 2010Co-Authors: Barbara Etschmann, Weihua Liu, Denis Testemale, Harald Müller, N. A. Rae, Olivier Proux, J. L. Hazemann, Joël BruggerAbstract:Chloride and Hydrosulfide are the principal ligands assumed to govern transport of copper in hydrothermal fluids. Existing solubility experiments suggest that Cu(I)-Hydrosulfide complexes are dominant compared to chloride complexes at low salinities in alkaline solutions (H2S(aq)/HS- pH buffer), and may be important in transporting Cu in low density magmatic vapors, potentially controlling the liquid-vapor partitioning of Cu. This study provides the first in situ evidence of the solubility of copper sulfides and the nature and structure of the predominant Cu species in sulfur-containing fluids at temperatures up to 592 degrees C and pressures of 180-600 bar. XANES and EXAFS data show that at elevated T (<= 200 degrees C), Cu solubility occurs via a linear Cu complex. At 428 degrees C in alkaline solutions. Cu is coordinated by two sulfur atoms in a distorted linear coordination (angle similar to 150-160 degrees). This geometry is consistent with the species Cu(HS)(2)(-) predicted by earlier solubility studies. In addition, in situ measurements of the solubility of chalcocite in 2 in NaHS solutions performed in this study are in remarkably good agreement with the solubilities calculated using available thermodynamic data for Cu(I)-Hydrosulfide complexes, also supporting the interpretation of speciation in these studies and validating the extrapolation of low-T thermodynamic properties for Cu(HS)(2)(-) to high P-T. Data on phase separation for the 2 m NaHS solution show that while significant amounts of copper can be partitioned into the vapor phase, there is no indication for preferential partitioning of Cu into the vapor. This is consistent with recent partitioning experiments conducted in autoclaves by Pokrovski et al. (2008a) and Simon et al. (2006). XANES data suggest that the species present in the low density phase is very similar to that present in the high density liquid, i.e., Cu(HS)(2)(-), although Cu(HS)(H2S)(0) cannot be excluded on the basis of XAS data.
-
An in situ XAS study of copper(I) transport as Hydrosulfide complexes in hydrothermal solutions (25-592 degrees C, 180-600 bar): Speciation and solubility in vapor and liquid phases
Geochimica et Cosmochimica Acta, 2010Co-Authors: Barbara Etschmann, Weihua Liu, Denis Testemale, Olivier Proux, J. L. Hazemann, Harald Mueller, Nick Rae, Joël BruggerAbstract:Chloride and Hydrosulfide are the principal ligands assumed to govern transport of copper in hydrothermal fluids. Existing solubility experiments suggest that Cu(I)-Hydrosulfide complexes are dominant compared to chloride complexes at low salinities in alkaline solutions (H2S(aq)/HS- pH buffer), and may be important in transporting Cu in low density magmatic vapors, potentially controlling the liquid-vapor partitioning of Cu. This study provides the first in situ evidence of the solubility of copper sulfides and the nature and structure of the predominant Cu species in sulfur-containing fluids at temperatures up to 592 degrees C and pressures of 180-600 bar. XANES and EXAFS data show that at elevated T (
-
An in situ XAS study of copper(I) transport as Hydrosulfide complexes in hydrothermal solutions (25–592 °C, 180–600 bar): Speciation and solubility in vapor and liquid phases
Geochimica et Cosmochimica Acta, 2010Co-Authors: Barbara Etschmann, Weihua Liu, Denis Testemale, Harald Müller, N. A. Rae, Olivier Proux, J. L. Hazemann, Joël BruggerAbstract:Chloride and Hydrosulfide are the principal ligands assumed to govern transport of copper in hydrothermal fluids. Existing solubility experiments suggest that Cu(I)-Hydrosulfide complexes are dominant compared to chloride complexes at low salinities in alkaline solutions (H2S(aq)/HS- pH buffer), and may be important in transporting Cu in low density magmatic vapors, potentially controlling the liquid-vapor partitioning of Cu. This study provides the first in situ evidence of the solubility of copper sulfides and the nature and structure of the predominant Cu species in sulfur-containing fluids at temperatures up to 592 degrees C and pressures of 180-600 bar. XANES and EXAFS data show that at elevated T (
