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Effects of iron surface adsorption and sample handling on iron solubility measurements

Effects of iron surface adsorption and sample handling on iron solubility measurements
Effects of iron surface adsorption and sample handling on iron solubility measurements
Seawater samples from two separate cruises in the Southern Ocean (ANTXXI/3 (EIFeX) and ANTXXIII/9) were collected for measurements of iron solubility by 55Fe addition. For both sets of samples, a significant loss of the dissolved portion of the added Fe was observed during the 72 hour duration of each Fe solubility measurement incubation. The decrease in dissolved Fe was related to Fe precipitation and adsorption onto bottle walls. The dissolved Fe data can be successfully modeled assuming that two colloidal Fe species (organically complexed Fe and inorganic Fe) were quickly formed following the addition of dissolved Fe(III) to the seawater. Model results indicate that Fe dissociated from weak organic complexes was the main contributor to wall sorption during the first 6 h following Fe addition, and that most of the Fe deposited after the first 6 h arose from the dissociation of colloidal inorganic species. Effects of sample freezing on Fe solubility measurements are also discussed.
0304-4203
48-55
Schlosser, C.
7990a0cc-cfe9-4dd5-9c45-899c03186207
De La Rocha, C.L.
1d731268-8926-4101-bee3-da281cecec35
Croot, P.L.
25daf592-4186-462b-b0fd-24c70d3fd605
Schlosser, C.
7990a0cc-cfe9-4dd5-9c45-899c03186207
De La Rocha, C.L.
1d731268-8926-4101-bee3-da281cecec35
Croot, P.L.
25daf592-4186-462b-b0fd-24c70d3fd605

Schlosser, C., De La Rocha, C.L. and Croot, P.L. (2011) Effects of iron surface adsorption and sample handling on iron solubility measurements. Marine Chemistry, 127 (1-4), 48-55. (doi:10.1016/j.marchem.2011.07.008).

Record type: Article

Abstract

Seawater samples from two separate cruises in the Southern Ocean (ANTXXI/3 (EIFeX) and ANTXXIII/9) were collected for measurements of iron solubility by 55Fe addition. For both sets of samples, a significant loss of the dissolved portion of the added Fe was observed during the 72 hour duration of each Fe solubility measurement incubation. The decrease in dissolved Fe was related to Fe precipitation and adsorption onto bottle walls. The dissolved Fe data can be successfully modeled assuming that two colloidal Fe species (organically complexed Fe and inorganic Fe) were quickly formed following the addition of dissolved Fe(III) to the seawater. Model results indicate that Fe dissociated from weak organic complexes was the main contributor to wall sorption during the first 6 h following Fe addition, and that most of the Fe deposited after the first 6 h arose from the dissociation of colloidal inorganic species. Effects of sample freezing on Fe solubility measurements are also discussed.

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More information

Published date: 20 December 2011
Organisations: Ocean Biochemistry & Ecosystems

Identifiers

Local EPrints ID: 207903
URI: http://eprints.soton.ac.uk/id/eprint/207903
ISSN: 0304-4203
PURE UUID: ab3a3ffa-6613-49fe-bb74-fbc789d293dc

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Date deposited: 12 Jan 2012 16:22
Last modified: 14 Mar 2024 04:41

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Contributors

Author: C. Schlosser
Author: C.L. De La Rocha
Author: P.L. Croot

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