The influence of UV irradiation on the photoreduction of iron in the Southern Ocean

Rijkenberg, Micha J.A.; Fischer, Astrid; Kroon, J. J.; Gerringa, Loes J. A.; Timmermans, Klaas R.; Wolterbeek, Hubert Th.; Baar, H. J. W. de

doi:10.1016/j.marchem.2004.03.021

Cited by 85 publications

(82 citation statements)

References 62 publications

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“…Philips UVB (TL-12), UVA (TL' 40W/05) and VIS (TL'D 36W/33) lamps were used in combination with Mylar, 50% cut-off at 320 nm, and UV-opaque PMMA filter, 50% cut-off at 380 nm, to create the three different optical treatments: UVB + UVA + VIS, UVA + VIS, and VIS in the UV-transparent PMMA bottles (50% cut-off at 290 nm) (Rijkenberg et al, 2005;Steeneken et al, 1995). Spectral conditions were measured inside each bottle using a MACAM Spectroradiometer SR9910 with a small spherical 4π sensor.…”

Section: Irradiance Treatmentsmentioning

confidence: 99%

“…with an α 375 of 0.05 m − 1 (Rijkenberg et al, 2005). Low concentrations of CDOM would limit the production of superoxide (Micinski et al, 1993) so that superoxide production would not interfere with the measurement of Fe(II) (Laglera and Van den Berg, 2007).…”

Section: Iron(ii) Analysismentioning

confidence: 99%

“…Photoproduced Fe(II) concentrations are strongly dependent on the intensity and wavelength of an irradiance treatment (Laglera and Van den Berg, 2007;Rijkenberg et al, 2005;Rijkenberg et al, 2004). In experiment A (Thalassiosira sp., + 5 nM Fe(III) addition), the concentration of Fe(II) increased with irradiance treatment where: UVB + UVA + VIS N UVA + VIS N VIS on the first day.…”

Section: Day 1 Lights Onmentioning

confidence: 99%

“…These Fe colloids might form a mixture of inorganic Fe(III) and organic material. Note that the colloidal fraction is seen as an important candidate to contain a photoreducible Fe fraction (Rijkenberg et al, 2005;Rijkenberg et al, 2004;, and is present in coastal regions as well as in the open ocean (Bergquist et al, 2007;Nishioka et al, 2005). Thalassiosira sp.…”

Section: Ferrous Ironmentioning

confidence: 99%

“…The majority of Fe(II) in the marine environment is a result of photo-induced reduction Rijkenberg et al, 2005). However, in lakes Fe(II) maxima coincide with chlorophyll-a maxima suggesting biological (induced) reduction of Fe(III) (Emmenegger et al, 2001;Shaked et al, 2002).…”

Section: Introductionmentioning

confidence: 97%

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Enhancement of the reactive iron pool by marine diatoms

et al. 2008

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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. Abstract Short term (2 days) laboratory experiments were performed to study the change in irradiance induced production of Fe(II) in seawater in the presence of two open oceanic Southern Ocean diatom species, Thalassiosira sp. and Chaetoceros brevis. Three irradiance conditions were applied: 1) UVB + UVA + VIS, 2) UVA + VIS, and 3) VIS, and Fe concentrations of 0 and 5 nM Fe were added to natural Southern Ocean seawater (containing 0.32 nM dissolved Fe and 1.69 equivalents of nM L − 1 Fe dissolved organic ligands, log K′ = 22.03). The photoproduced concentration of Fe(II) showed no relationship with the concentration of total dissolved Fe or the concentration of strongly chelated iron. During incubations with the diatoms an increase in the Fe(II) concentration during the second day suggested a modification of the Fe speciation. In the presence of Thalassiosira sp. photoreduction of Fe(III) was observed, whereas in the presence of C. brevis irradiance independent Fe(III) reduction played an important role in the Fe(II) production. Furthermore, a decrease in the strongly chelated Fe concentration, in concert with a decrease in the conditional stability constant, suggested a modification of the strongly chelated Fe fraction in the experiments with C. brevis. The chelated Fe fraction did not change in cultures with Thalassiosira sp. Overall, the presence of diatoms appeared to enhance the reactive Fe pool improving the biological availability of Fe.

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Section: Irradiance Treatmentsmentioning

confidence: 99%

Section: Iron(ii) Analysismentioning

confidence: 99%

Section: Day 1 Lights Onmentioning

confidence: 99%

Section: Ferrous Ironmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Enhancement of the reactive iron pool by marine diatoms

et al. 2008

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Oxidative Challenges in Polar Seas

Regoli

Benedetti

Krell

et al. 2011

Oxidative Stress in Aquatic Ecosystems

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Anodic Stripping Voltammetric Determination of Iron(II) at a Carbon Paste Electrode Modified with Dithiodianiline (DTDA) and Gold Nanoparticles (GNP)

2011

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A differential pulse anodic stripping voltammetric procedure was developed for the determination of trace amounts of iron(II) in the presence of iron(III) at a carbon paste electrode (CPE) modified with dithiodianiline and gold nanoparticle. At the pH working of 3.0, a wide concentration range from 0.1 nM to 100 nM was observed with the detection limit of 0.05 nM. The relative standard deviation for a solution containing 50 nM of iron(II) was found to be 3.11 % (n = 9). Possible interferences from the coexisting ions were also investigated. The validity of the method and applicability of the sensor were successfully tested by determining of iron(II) in lentil, wheat seed and barley seed samples.

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The influence of UV irradiation on the photoreduction of iron in the Southern Ocean

Cited by 85 publications

References 62 publications

Enhancement of the reactive iron pool by marine diatoms

Enhancement of the reactive iron pool by marine diatoms

Oxidative Challenges in Polar Seas

Anodic Stripping Voltammetric Determination of Iron(II) at a Carbon Paste Electrode Modified with Dithiodianiline (DTDA) and Gold Nanoparticles (GNP)

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