The Intrinsic Stability of Metal Ion Complexes with Nanoparticulate Fulvic Acids
The electrostatic contributions to metal ion binding by fulvic acids (FAs) are characterized in light of recent theoretical developments on description of the net charge density of soft nanoparticles. Under practical electrolyte concentrations, the radius of the small, highly charged soft nanoparticulate FAs is comparable to the electrostatic screening length and their electric potential profile has a bell shape that extends into the surrounding aqueous medium. Consequently, accumulation of counterions in the extraparticulate zone can be significant. By comparison of experimentally derived Boltzmann partitioning coefficients with those computed on the basis of (i) the structural FA particle charge and (ii) the potential profile for a nanoparticulate FA entity equilibrated with indifferent electrolyte, we identify the thickness of the extraparticulate counter charge accumulation shell in 1-1 and 2-1 electrolytes. The results point to the involvement of counterion condensation phenomena and call into question the approaches for modeling electrostatic contributions to ion binding that are invoked by popular equilibrium speciation codes. Overall, the electrostatic contributions to Cdaq2+ and Cuaq2+ association with FA are weaker than those previously found for much larger humic acids (HA). The intrinsic chemical binding strength of CdFA is comparable to that of CdHA, whereas CuFA complexes are weaker than CuHA ones.
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dig-wur-nl-wurpubs-5439102024-09-30 Town, Raewyn M. Duval, Jérôme F.L. van Leeuwen, Herman P. Article/Letter to editor Environmental Science and Technology 52 (2018) 20 ISSN: 0013-936X The Intrinsic Stability of Metal Ion Complexes with Nanoparticulate Fulvic Acids 2018 The electrostatic contributions to metal ion binding by fulvic acids (FAs) are characterized in light of recent theoretical developments on description of the net charge density of soft nanoparticles. Under practical electrolyte concentrations, the radius of the small, highly charged soft nanoparticulate FAs is comparable to the electrostatic screening length and their electric potential profile has a bell shape that extends into the surrounding aqueous medium. Consequently, accumulation of counterions in the extraparticulate zone can be significant. By comparison of experimentally derived Boltzmann partitioning coefficients with those computed on the basis of (i) the structural FA particle charge and (ii) the potential profile for a nanoparticulate FA entity equilibrated with indifferent electrolyte, we identify the thickness of the extraparticulate counter charge accumulation shell in 1-1 and 2-1 electrolytes. The results point to the involvement of counterion condensation phenomena and call into question the approaches for modeling electrostatic contributions to ion binding that are invoked by popular equilibrium speciation codes. Overall, the electrostatic contributions to Cdaq2+ and Cuaq2+ association with FA are weaker than those previously found for much larger humic acids (HA). The intrinsic chemical binding strength of CdFA is comparable to that of CdHA, whereas CuFA complexes are weaker than CuHA ones. en application/pdf https://research.wur.nl/en/publications/the-intrinsic-stability-of-metal-ion-complexes-with-nanoparticula 10.1021/acs.est.8b02896 https://edepot.wur.nl/465457 Life Science Wageningen University & Research |
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Life Science Life Science Town, Raewyn M. Duval, Jérôme F.L. van Leeuwen, Herman P. The Intrinsic Stability of Metal Ion Complexes with Nanoparticulate Fulvic Acids |
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The electrostatic contributions to metal ion binding by fulvic acids (FAs) are characterized in light of recent theoretical developments on description of the net charge density of soft nanoparticles. Under practical electrolyte concentrations, the radius of the small, highly charged soft nanoparticulate FAs is comparable to the electrostatic screening length and their electric potential profile has a bell shape that extends into the surrounding aqueous medium. Consequently, accumulation of counterions in the extraparticulate zone can be significant. By comparison of experimentally derived Boltzmann partitioning coefficients with those computed on the basis of (i) the structural FA particle charge and (ii) the potential profile for a nanoparticulate FA entity equilibrated with indifferent electrolyte, we identify the thickness of the extraparticulate counter charge accumulation shell in 1-1 and 2-1 electrolytes. The results point to the involvement of counterion condensation phenomena and call into question the approaches for modeling electrostatic contributions to ion binding that are invoked by popular equilibrium speciation codes. Overall, the electrostatic contributions to Cdaq2+ and Cuaq2+ association with FA are weaker than those previously found for much larger humic acids (HA). The intrinsic chemical binding strength of CdFA is comparable to that of CdHA, whereas CuFA complexes are weaker than CuHA ones. |
format |
Article/Letter to editor |
topic_facet |
Life Science |
author |
Town, Raewyn M. Duval, Jérôme F.L. van Leeuwen, Herman P. |
author_facet |
Town, Raewyn M. Duval, Jérôme F.L. van Leeuwen, Herman P. |
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Town, Raewyn M. |
title |
The Intrinsic Stability of Metal Ion Complexes with Nanoparticulate Fulvic Acids |
title_short |
The Intrinsic Stability of Metal Ion Complexes with Nanoparticulate Fulvic Acids |
title_full |
The Intrinsic Stability of Metal Ion Complexes with Nanoparticulate Fulvic Acids |
title_fullStr |
The Intrinsic Stability of Metal Ion Complexes with Nanoparticulate Fulvic Acids |
title_full_unstemmed |
The Intrinsic Stability of Metal Ion Complexes with Nanoparticulate Fulvic Acids |
title_sort |
intrinsic stability of metal ion complexes with nanoparticulate fulvic acids |
url |
https://research.wur.nl/en/publications/the-intrinsic-stability-of-metal-ion-complexes-with-nanoparticula |
work_keys_str_mv |
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