Dissolved iron at subnanomolar levels in the Southern Ocean as determined by ship-board analysis

Jong, Jeroen de; Das, Jyotirmaya; Bathmann, Ulrich; Stoll, M. H. C.; Kattner, Gerhard; Nolting, R.F.; Baar, H. J. W. de

doi:10.1016/s0003-2670(98)00427-9

Cited by 126 publications

(73 citation statements)

References 31 publications

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“…The data collected here on several occasions show significant differences between DFe, as measured by the luminol H 2 O 2 chemiluminescence method (de Jong et al, 1998;Obata et al, 1993Obata et al, , 1997, and Fe(II) as measured by luminol chemiluminescence (Croot and Laan, 2002). The main reason for this discrepancy appeared to be the long half-life of the Fe(II) and the loading pH employed with the Fe(III) method.…”

Section: Implications For Iron Measurementsmentioning

confidence: 60%

“…The main reason for this discrepancy appeared to be the long half-life of the Fe(II) and the loading pH employed with the Fe(III) method. Work by de Jong et al (1998) showed that Fe(II) was only loaded onto the preconcentration columns used in the present study at a pHN5, thus at the loading pH of 4.5 used in this study, Fe(II) would be poorly recovered. In all cases during EisenEx seawater samples were acidified and left at room temperature for at least 1 h before analysis.…”

Section: Implications For Iron Measurementsmentioning

confidence: 85%

“…The original drain cock had been replaced by a Teflon stopcock. The cleaning procedures and handling of the GO-FLO bottles has been described early (de Jong et al, 1998). Immediately upon recovery of the bottles, samples were filtered in-line through 0.2 Am filter cartridges (Sartorious Sartobran filter capsule 5231307H5) by N 2 overpressure into acidcleaned sampled bottles: 60 mL Teflon bottles (Nalgene) for Fe(II) analysis immediately, 100 mL polyethylene bottles (Kartell) for dissolved and total iron (unfiltered samples) analysis.…”

Section: Sampling Of Near Surface Watersmentioning

confidence: 99%

“…Dissolved iron (DFe-defined here as that Fe which passed through a 0.2-Am filter cartridge) and total iron (TFe-unfiltered) was determined as Fe(III) using a chemiluminescence flow injection method employing luminol and H 2 O 2 (de Jong et al, 1998). Typical detection limits and blank values for this system at the time of operation were 0.021 and 0.022 nM, respectively.…”

Section: Dissolved and Total Ironmentioning

confidence: 99%

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Spatial and temporal distribution of Fe(II) and H2O2 during EisenEx, an open ocean mescoscale iron enrichment

et al. 2005

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Copyright Other than for strictly personal use, it is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license (like Creative Commons).Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. concentrations increased at the depth of the chlorophyll maximum when iron concentrations returned to pre-infusion concentrations (b80 pM) possibly due to biological production related to iron reductase activity.In this work, Fe(II) and dissolved iron were used as tracers themselves for subsequent iron infusions when no further SF 6 was added. EisenEx was subject to periods of weak and strong mixing. Slow mixing after the second infusion allowed significant concentrations of Fe(II) and Fe to exist for several days. During this time, dissolved and total iron in the infusion plume behaved almost conservatively as it was trapped between a relict mixed layer and a new rain-induced mixed layer. Using dissolved iron, a value for the vertical diffusion coefficient K z =6.7F0.7 cm 2 s À1 was obtained for this 2-day period. During a subsequent surface survey of the iron-enriched patch, elevated levels of Fe(II) were found in surface waters presumably from Fe(II) dissolved in the rainwater that was falling at this time.Model results suggest that the reaction between uncomplexed Fe(III) and O 2 À was a significant source of Fe(II) during EisenEx and helped to maintain high levels of Fe(II) in the water column. This phenomenon may occur in iron enrichment experiments when two conditions are met: (i) When Fe is added to a system already saturated with regard to organic complexation and (ii) when mixing processes are slow, thereby reducing the dispersion of iron into under-saturated waters. D

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Section: Implications For Iron Measurementsmentioning

confidence: 60%

Section: Implications For Iron Measurementsmentioning

confidence: 85%

Section: Sampling Of Near Surface Watersmentioning

confidence: 99%

Section: Dissolved and Total Ironmentioning

confidence: 99%

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Spatial and temporal distribution of Fe(II) and H2O2 during EisenEx, an open ocean mescoscale iron enrichment

et al. 2005

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“…5 m from the ship's starboard side and deployed at 1-2 m below the surface (de Jong et al, 1998;Bowie et al, 2002, in press). Surface water was pumped on-board with a peristaltic pump directly into a clean container and filtered on-line through a 0.2 mm filtration cartridge (Sartobran-P capsules, Sartorius).…”

Section: Seawater Samplesmentioning

confidence: 99%

Atmospheric iron deposition and sea-surface dissolved iron concentrations in the eastern Atlantic Ocean

Sarthou¹,

Baker²,

Blain³

et al. 2003

Deep Sea Research Part I: Oceanographic Research Papers

182

145

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Atmospheric iron and underway sea-surface dissolved (o0.2 mm) iron (DFe) concentrations were investigated along a north-south transect in the eastern Atlantic Ocean (27 N/16 W-19 S/5 E). Fe concentrations in aerosols and dry deposition fluxes of soluble Fe were at least two orders of magnitude higher in the Saharan dust plume than at the equator or at the extreme south of the transect. A weaker source of atmospheric Fe was also observed in the South Atlantic, possibly originating in southern Africa via the north-easterly outflow of the Angolan plume. Estimations of total atmospheric deposition fluxes (dry plus wet) of soluble Fe suggested that wet deposition dominated in the intertropical convergence zone, due to the very high amount of precipitation and to the fact that a substantial part of Fe was delivered in dissolved form. On the other hand, dry deposition dominated in the other regions of the transect (73-97%), where rainfall rates were much lower. Underway sea-surface DFe concentrations ranged 0.02-1.1 nM. Such low values (0.02 nM) are reported for the first time in the Atlantic Ocean and may be (co)-limiting for primary production. A significant correlation (Spearman's rho=0.862, po0:01) was observed between mean DFe concentrations and total atmospheric deposition fluxes, confirming the importance of atmospheric deposition on the iron cycle in the Atlantic. Residence time of DFe in the surface waters relative to atmospheric inputs were estimated in the northern part of our study area (1778 to 28716 d). These values confirmed the rapid removal of Fe from the surface waters, possibly by colloidal aggregation. r

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Analytical applications of flow injection with chemiluminescence detection—a review

et al. 2001

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This paper reviews the literature on analytical applications of flow injection (FI) techniques with chemiluminescence (CL) detection from 1995-1999. The focus is on the application of FI-CL to the quantitative determination of specific analytes in real sample matrices. Therefore, entries have been tabulated under the most appropriate application area, ie pharmaceutical, environmental, foods and beverages and biomedical, as defined by the matrix that has been analysed. Each table lists analytes alphabetically and gives details of the exact sample matrix, the limit of detection (as reported in the original paper) and comments on the CL reaction used.

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Dissolved iron at subnanomolar levels in the Southern Ocean as determined by ship-board analysis

Cited by 126 publications

References 31 publications

Spatial and temporal distribution of Fe(II) and H2O2 during EisenEx, an open ocean mescoscale iron enrichment

Spatial and temporal distribution of Fe(II) and H2O2 during EisenEx, an open ocean mescoscale iron enrichment

Atmospheric iron deposition and sea-surface dissolved iron concentrations in the eastern Atlantic Ocean

Analytical applications of flow injection with chemiluminescence detection—a review

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