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

C. Schlosser; C. L. De La Rocha; P. L. Croot

doi:10.1016/j.marchem.2011.07.008

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

C. Schlosser
, C. L. De La Rocha
, P. L. Croot

Research output: Contribution to a Journal (Peer & Non Peer) › Article › peer-review

12 Citations (Scopus)

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 72hour 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 6h following Fe addition, and that most of the Fe deposited after the first 6h arose from the dissociation of colloidal inorganic species. Effects of sample freezing on Fe solubility measurements are also discussed.

Original language	English
Pages (from-to)	48-55
Number of pages	8
Journal	Marine Chemistry
Volume	127
Issue number	1-4
DOIs	https://doi.org/10.1016/j.marchem.2011.07.008
Publication status	Published - 20 Dec 2011
Externally published	Yes

Keywords

Iron solubility
Southern Ocean
Wall adsorption

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10.1016/j.marchem.2011.07.008

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title = "Effects of iron surface adsorption and sample handling on iron solubility measurements",

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 72hour 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 6h following Fe addition, and that most of the Fe deposited after the first 6h arose from the dissociation of colloidal inorganic species. Effects of sample freezing on Fe solubility measurements are also discussed.",

keywords = "Iron solubility, Southern Ocean, Wall adsorption",

author = "C. Schlosser and \{De La Rocha\}, \{C. L.\} and Croot, \{P. L.\}",

year = "2011",

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doi = "10.1016/j.marchem.2011.07.008",

language = "English",

volume = "127",

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journal = "Marine Chemistry",

issn = "0304-4203",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Effects of iron surface adsorption and sample handling on iron solubility measurements

AU - Schlosser, C.

AU - De La Rocha, C. L.

AU - Croot, P. L.

PY - 2011/12/20

Y1 - 2011/12/20

N2 - 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 72hour 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 6h following Fe addition, and that most of the Fe deposited after the first 6h arose from the dissociation of colloidal inorganic species. Effects of sample freezing on Fe solubility measurements are also discussed.

AB - 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 72hour 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 6h following Fe addition, and that most of the Fe deposited after the first 6h arose from the dissociation of colloidal inorganic species. Effects of sample freezing on Fe solubility measurements are also discussed.

KW - Iron solubility

KW - Southern Ocean

KW - Wall adsorption

UR - https://www.scopus.com/pages/publications/81455133010

U2 - 10.1016/j.marchem.2011.07.008

DO - 10.1016/j.marchem.2011.07.008

M3 - Article

SN - 0304-4203

VL - 127

SP - 48

EP - 55

JO - Marine Chemistry

JF - Marine Chemistry

IS - 1-4

ER -

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

Abstract

Keywords

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