Automated determination of iron in seawater by chelating resin concentration and chemiluminescence detection

Obata, Hajime; Karatani, Hajime; Nakayama, Eiichiro

doi:10.1021/ac00059a007

Cited by 383 publications

(230 citation statements)

References 9 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: 63%

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: 63%

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

et al. 2005

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“…TDFe represents the concentration of dissolved iron plus the most labile fraction of particulate iron (Löscher et al, 1997). Flow Injection Analysis (FIA), with on line preconcentration and chemiluminescence detection, was used for on board measurement of DFe concentration (Obata et al, 1993). The pH of the acidified sample was adjusted to 4.5 using ammonia (25% Merck, ®Ultrapure) and purified ammonium acetate buffer (2 M), before loading onto a 8-hydroxyquinoline preconcentration column (8HQ, resin D, from Dierssen et al, 2001).…”

Section: Sampling and Methodsmentioning

confidence: 99%

Sources and transport of dissolved iron and manganese along the continental margin of the Bay of Biscay

Laës-Huon¹,

Blain

Laan

et al. 2007

Biogeosciences

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Abstract. Dissolved iron (DFe; <0.2 µm) and dissolved manganese (DMn; <0.2 µm) concentrations were determined in the water column of the Bay of Biscay (eastern North Atlantic Ocean) in March 2002. The samples were collected along a transect traversing from the European continental shelf over the continental slope. The highest DFe and DMn concentrations (2.39 nM and 6.10 nM, respectively) were observed in the bottom waters on the shelf at stations closest to the coast. The release of trace metal from resuspended particles and the diffusion from pore waters were probably at the origin of elevated DFe and DMn concentrations in the Bottom Boundary Layer (BBL). In the slope region, the highest total dissolvable iron (TDFe), DFe and DMn values (24.6 nM, 1.58 nM and 2.12 nM, respectively) were observed close to the bottom at depth of ca. 600-700 m. Internal wave activity and slope circulation are thought to be at the origin of this phenomenon. These processes were also very likely the cause of elevated concentrations (DFe: 1.27 nM, DMn: 2.34 nM) measured in surface waters of stations located in the same area. At stations off the continental slope, the vertical distribution of both metals were typical of open ocean conditions, indicating that inputs from the continental margin did not impact the metal distributions in the offshore waters.

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“…[7] Dissolved iron concentrations were determined according to a chemiluminescence method adapted from Obata et al [1993]. Two calibration curves were generated by adding increasing amounts of a standard iron solution to seawater with dissolved iron concentration equal to 1 nM: one curve for the low concentrations up to 2 nM (LD = 0.03 nM; blank = 0.10 nM) and the other for the high concentrations between 2 and 8 nM (DL = 0.13 nM; blank = 0.27 nM).…”

Section: Analysis Of Dissolved Iron (Dfe)mentioning

confidence: 99%

Dissolution of atmospheric iron in seawater

Bonnet¹

2004

Geophysical Research Letters

127

120

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In vitro dissolution experiments were conducted in seawater in order to quantify the partitioning between dissolved and particulate phases of iron associated to Saharan dust and urban particles. The percentage of iron released was very low (0.05 to 2.2%) depending on the particulate load, the aerosol source and the contact time. This percentage decreased with the amount of particles introduced following a power law, indicating that the process could be modeled. Indeed, these dissolution processes were a function of the lability of iron in relation to the particle source, the particle size and adsorption processes. According to these experiments, the dissolved iron induced in a 10 m mixed layer by Saharan events of various magnitudes ranges from 0.07 to 1 nM. Since these concentrations are in agreement with the natural iron requirements for the phytoplankton, such inputs can profoundly influence the primary production, especially in oligotrophic conditions.

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Automated determination of iron in seawater by chelating resin concentration and chemiluminescence detection

Cited by 383 publications

References 9 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

Sources and transport of dissolved iron and manganese along the continental margin of the Bay of Biscay

Dissolution of atmospheric iron in seawater

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