Kinetic study reveals weak Fe-binding ligand, which affects the solubility of Fe in the Scheldt estuary
The chemistry of dissolved Fe(III) was studied in the Scheldt estuary (The Netherlands). Two discrete size fractions of the dissolved bulk (<0.2 mu m and <1 kDa) were considered at three salinities (S = 26, 10 and 0.3). Within the upper estuary, where fresh river water meets seawater, the diss...
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Language: | English |
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2007
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Online Access: | https://hdl.handle.net/11370/c754fa7e-5d1d-4bee-b250-219b65f07d5d https://research.rug.nl/en/publications/c754fa7e-5d1d-4bee-b250-219b65f07d5d https://doi.org/10.1016/j.marchem.2006.06.002 https://pure.rug.nl/ws/files/6702514/2007MarChemGerringa.pdf |
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ftunigroningenpu:oai:pure.rug.nl:publications/c754fa7e-5d1d-4bee-b250-219b65f07d5d 2024-06-02T08:14:50+00:00 Kinetic study reveals weak Fe-binding ligand, which affects the solubility of Fe in the Scheldt estuary Gerringa, L. J. A. Rijkenberg, M. J. A. Wolterbeek, H. Th. Verburg, T. G. Boye, M. de Baar, H. J. W. 2007-01-08 application/pdf https://hdl.handle.net/11370/c754fa7e-5d1d-4bee-b250-219b65f07d5d https://research.rug.nl/en/publications/c754fa7e-5d1d-4bee-b250-219b65f07d5d https://doi.org/10.1016/j.marchem.2006.06.002 https://pure.rug.nl/ws/files/6702514/2007MarChemGerringa.pdf eng eng https://research.rug.nl/en/publications/c754fa7e-5d1d-4bee-b250-219b65f07d5d info:eu-repo/semantics/openAccess Gerringa , L J A , Rijkenberg , M J A , Wolterbeek , H T , Verburg , T G , Boye , M & de Baar , H J W 2007 , ' Kinetic study reveals weak Fe-binding ligand, which affects the solubility of Fe in the Scheldt estuary ' , Marine Chemistry , vol. 103 , no. 1-2 , pp. 30-45 . https://doi.org/10.1016/j.marchem.2006.06.002 iron ligand estuary Fe species kinetic rate constants MARINE IRON(III) COMPLEXES CATHODIC STRIPPING VOLTAMMETRY NATURAL ORGANIC-LIGANDS TRACE-METALS SOUTHERN-OCEAN CLE-ADSV IRON COMPLEXATION ATLANTIC-OCEAN CHEMICAL SPECIATION COASTAL WATERS article 2007 ftunigroningenpu https://doi.org/10.1016/j.marchem.2006.06.002 2024-05-07T18:27:52Z The chemistry of dissolved Fe(III) was studied in the Scheldt estuary (The Netherlands). Two discrete size fractions of the dissolved bulk (<0.2 mu m and <1 kDa) were considered at three salinities (S = 26, 10 and 0.3). Within the upper estuary, where fresh river water meets seawater, the dissolved Fe concentration decreases steeply with increasing salinity, for the fraction <0.2 mu m from 536 nM at S=0.3 to 104 nM at S = 10 and for the fraction <1 kDa from 102 nM to 36 nM Fe. Further downstream, in the middle and lower estuary, this decrease in the Fe concentration continues, but is far less pronounced. For all samples, the traditionally recognised dissolved strong organic Fe-binding ligand concentrations are lower than the dissolved Fe concentrations. Characteristics of dissolved Fe-binding ligands were determined by observing kinetic interactions with adsorptive cathodic stripping voltammetry. From these kinetic experiments we concluded that apart from the well-known strong Fe-binding organic ligands (L, logK' = 19-22) also weak Fe-binding ligands (P) existed with an a value (binding potential = K-1.[P]) varying between 10(11.1) and 10(11.9). The presence of this relatively weak ligand explained the high concentrations of labile Fe present in both size fractions in the estuary. This weak ligand can retard or prevent a direct precipitation after an extra input of Fe. The dissociation rate constants of the weak ligand varied between 0.5 x 10(-4) and 4.3 x 10(-4) s(-1). The rate constants of the strong organic ligand varied between k(d) = 1.5 x 10(-3) 17 x 10(-2) s(-1) and k(f) = 2.2 x 10(8)-2.7 x 10(9) M-1 s(-1). The dissociation rate constant of freshly amorphous Fe-hydroxide was found to be between 4.3 x 10(-4) and 3.7 x 10(-3) s(-1), more labile or equal to the values found by Rose and Waite [Rose, A.L., Waite, T.D., 2003a. Kinetics of hydrolysis and precipitation of ferric iron in seawater. Environ. Sci. Technol., 37, 3897-3903.] for freshly precipitated Fe in seawater. Kinetic rate constants of ... Article in Journal/Newspaper Southern Ocean University of Groningen research database Southern Ocean Marine Chemistry 103 1-2 30 45 |
institution |
Open Polar |
collection |
University of Groningen research database |
op_collection_id |
ftunigroningenpu |
language |
English |
topic |
iron ligand estuary Fe species kinetic rate constants MARINE IRON(III) COMPLEXES CATHODIC STRIPPING VOLTAMMETRY NATURAL ORGANIC-LIGANDS TRACE-METALS SOUTHERN-OCEAN CLE-ADSV IRON COMPLEXATION ATLANTIC-OCEAN CHEMICAL SPECIATION COASTAL WATERS |
spellingShingle |
iron ligand estuary Fe species kinetic rate constants MARINE IRON(III) COMPLEXES CATHODIC STRIPPING VOLTAMMETRY NATURAL ORGANIC-LIGANDS TRACE-METALS SOUTHERN-OCEAN CLE-ADSV IRON COMPLEXATION ATLANTIC-OCEAN CHEMICAL SPECIATION COASTAL WATERS Gerringa, L. J. A. Rijkenberg, M. J. A. Wolterbeek, H. Th. Verburg, T. G. Boye, M. de Baar, H. J. W. Kinetic study reveals weak Fe-binding ligand, which affects the solubility of Fe in the Scheldt estuary |
topic_facet |
iron ligand estuary Fe species kinetic rate constants MARINE IRON(III) COMPLEXES CATHODIC STRIPPING VOLTAMMETRY NATURAL ORGANIC-LIGANDS TRACE-METALS SOUTHERN-OCEAN CLE-ADSV IRON COMPLEXATION ATLANTIC-OCEAN CHEMICAL SPECIATION COASTAL WATERS |
description |
The chemistry of dissolved Fe(III) was studied in the Scheldt estuary (The Netherlands). Two discrete size fractions of the dissolved bulk (<0.2 mu m and <1 kDa) were considered at three salinities (S = 26, 10 and 0.3). Within the upper estuary, where fresh river water meets seawater, the dissolved Fe concentration decreases steeply with increasing salinity, for the fraction <0.2 mu m from 536 nM at S=0.3 to 104 nM at S = 10 and for the fraction <1 kDa from 102 nM to 36 nM Fe. Further downstream, in the middle and lower estuary, this decrease in the Fe concentration continues, but is far less pronounced. For all samples, the traditionally recognised dissolved strong organic Fe-binding ligand concentrations are lower than the dissolved Fe concentrations. Characteristics of dissolved Fe-binding ligands were determined by observing kinetic interactions with adsorptive cathodic stripping voltammetry. From these kinetic experiments we concluded that apart from the well-known strong Fe-binding organic ligands (L, logK' = 19-22) also weak Fe-binding ligands (P) existed with an a value (binding potential = K-1.[P]) varying between 10(11.1) and 10(11.9). The presence of this relatively weak ligand explained the high concentrations of labile Fe present in both size fractions in the estuary. This weak ligand can retard or prevent a direct precipitation after an extra input of Fe. The dissociation rate constants of the weak ligand varied between 0.5 x 10(-4) and 4.3 x 10(-4) s(-1). The rate constants of the strong organic ligand varied between k(d) = 1.5 x 10(-3) 17 x 10(-2) s(-1) and k(f) = 2.2 x 10(8)-2.7 x 10(9) M-1 s(-1). The dissociation rate constant of freshly amorphous Fe-hydroxide was found to be between 4.3 x 10(-4) and 3.7 x 10(-3) s(-1), more labile or equal to the values found by Rose and Waite [Rose, A.L., Waite, T.D., 2003a. Kinetics of hydrolysis and precipitation of ferric iron in seawater. Environ. Sci. Technol., 37, 3897-3903.] for freshly precipitated Fe in seawater. Kinetic rate constants of ... |
format |
Article in Journal/Newspaper |
author |
Gerringa, L. J. A. Rijkenberg, M. J. A. Wolterbeek, H. Th. Verburg, T. G. Boye, M. de Baar, H. J. W. |
author_facet |
Gerringa, L. J. A. Rijkenberg, M. J. A. Wolterbeek, H. Th. Verburg, T. G. Boye, M. de Baar, H. J. W. |
author_sort |
Gerringa, L. J. A. |
title |
Kinetic study reveals weak Fe-binding ligand, which affects the solubility of Fe in the Scheldt estuary |
title_short |
Kinetic study reveals weak Fe-binding ligand, which affects the solubility of Fe in the Scheldt estuary |
title_full |
Kinetic study reveals weak Fe-binding ligand, which affects the solubility of Fe in the Scheldt estuary |
title_fullStr |
Kinetic study reveals weak Fe-binding ligand, which affects the solubility of Fe in the Scheldt estuary |
title_full_unstemmed |
Kinetic study reveals weak Fe-binding ligand, which affects the solubility of Fe in the Scheldt estuary |
title_sort |
kinetic study reveals weak fe-binding ligand, which affects the solubility of fe in the scheldt estuary |
publishDate |
2007 |
url |
https://hdl.handle.net/11370/c754fa7e-5d1d-4bee-b250-219b65f07d5d https://research.rug.nl/en/publications/c754fa7e-5d1d-4bee-b250-219b65f07d5d https://doi.org/10.1016/j.marchem.2006.06.002 https://pure.rug.nl/ws/files/6702514/2007MarChemGerringa.pdf |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Gerringa , L J A , Rijkenberg , M J A , Wolterbeek , H T , Verburg , T G , Boye , M & de Baar , H J W 2007 , ' Kinetic study reveals weak Fe-binding ligand, which affects the solubility of Fe in the Scheldt estuary ' , Marine Chemistry , vol. 103 , no. 1-2 , pp. 30-45 . https://doi.org/10.1016/j.marchem.2006.06.002 |
op_relation |
https://research.rug.nl/en/publications/c754fa7e-5d1d-4bee-b250-219b65f07d5d |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.marchem.2006.06.002 |
container_title |
Marine Chemistry |
container_volume |
103 |
container_issue |
1-2 |
container_start_page |
30 |
op_container_end_page |
45 |
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1800738831496904704 |