Phase partitioning and solubility of iron in natural seawater ...

2004-10-28 · The estuarine seawater exhibited the highest resistance to UV oxidation. These results strongly suggest the importance of quantifying the DOC concentration after UV irradiation. [16] Using 59 Fe as a tracer, the Fe removal efficiency of Chelex 100 resin was determined by measuring the radioactivity before and after passing through the resin column.

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Iron(II) oxidation by hydrogen peroxide in seawater: …

2000-4-18 · Request PDF | Iron(II) oxidation by hydrogen peroxide in seawater: Implications for global climate change. University of Madras, Chennai. | The …

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The rate of oxidation of ferrous iron in seawater and the …

At the Minamichita Beach Land (Mihama-cho, , Japan), seawater is pumped up from underground and is supplied to aquaria. The underground seawater containsca. 2 ppm of Fe (II), 0.1 ppm of Mn (II) and a little dissolved oxygen. Iron oxide is formed in the seawater when aerated. The oxidation rate of Fe (II) was measured to be 1.4×1014 mol−3 l 3 min−1, which is …

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The solubility of iron in seawater

Determination of iron in seawater - ScienceDirect

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Kinetics of iron(II) oxidation in seawater of various pH

The rate of iron(II) oxidation in North Sea water of pH 5.5–10 in the range 10–25°C has been studied. The oxygenation rate depends linearly on the iron(II) and dissolved oxygen concentrations. The second-order dependence on [OH−], found by several investigators for synthetic solutions, was confirmed in seawater, but only for pOH > 6.9. For pOH < 5.9 the rate …

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The Solubility of iron in seawater | Request PDF

2002-1-31 · The solubilities of iron (III) hydroxides in seawater were determined in Gulf Stream seawater as a function of pH (2 to 9), temperature (5 to …

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Aerobic and anaerobic iron oxidizers together drive …

2020-12-17 · In principle, iron oxidation can fuel significant primary productivity and nutrient cycling in dark environments such as the deep sea. However, we have an extremely limited understanding of the ...

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Kinetics of the Iron(II)

2013-3-12 · Kinetics of iron(II)- and manganese(II)-catalyzed oxidation of S(IV) in seawater were studied here to provide theoretical support for the flue gas desulfurization process (SFGD). Experiments were carried out with artificial seawater and acetic buffer. Results indicated that the reaction order with respect to dissolved oxygen is zero. However, the reaction order with …

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The rate of oxidation of ferrous iron in seawater and the …

At the Minamichita Beach Land (Mihama-cho, , Japan), seawater is pumped up from underground and is supplied to aquaria. The underground seawater containsca. 2 ppm of Fe (II), 0.1 ppm of Mn (II) and a little dissolved oxygen. Iron oxide is formed in the seawater when aerated. The oxidation rate of Fe (II) was measured to be 1.4×1014 mol−3l3 min−1, which is …

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Iron Oxidation at Low Temperature (260–500 °C) in Air and …

2009-8-1 · The oxidation of iron has been studied at low temperatures (between 260 and 500 °C) in dry air or air with 2 vol% H2O, in the framework of research on dry corrosion of nuclear waste containers during long-term interim storage. Pure iron is regarded as a model material for low-alloyed steel. Oxidation tests were performed in a thermobalance (up to 250 h) or in a …

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The solubility of iron in seawater

2002-1-1 · 1.. IntroductionThe chemistry of iron in natural waters has received a lot of attention in recent years Chisholm and Morel, 1991, Bruland and Wells, 1995.Much of this interest comes from its limitations in high-nutrient low-chlorophyll waters (Martin and Fitzwater, 1988).Although iron is one of the most abundant elements on earth, its concentration in seawater is very low …

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Electrochemical Methods for Water Purification, Ion …

2022-7-30 · Agricultural development, extensive industrialization, and rapid growth of the global population have inadvertently been accompanied by environmental pollution. Water pollution is exacerbated by the decreasing ability of traditional treatment methods to comply with tightening environmental standards. This review provides a comprehensive description of the principles …

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Oxidation of Iron(II) nanomolar with H2O2 in seawater

2005-1-1 · The iron(II) oxidation kinetic process was studied at 25 stations in coastal seawater of the Macaronesia region (9 around Cape Verde, 11 around the Canary Islands, and 5 …

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Kinetics of Hydrolysis and Precipitation of Ferric Iron in …

2003-8-5 · We have investigated the kinetics of iron hydrolysis and precipitation and dissolution of the solid formed via a novel chemical method, namely accessibility of iron to the fungal siderophore desferrioxamine B (DFB), with spectrophotometric detection of the ferrioxamine complex. Our results support a mechanism in which precipitation of dissolved inorganic iron in …

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Iron Speciation in Seawater

2016-11-1 · The speciation of iron in seawater is an extremely complex issue for which there is no ideal logical presentation. The chapter proposes a …

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Ocean acidification affects iron speciation in seawater

2009-7-9 · The oxidation of Fe(II) in artificial seawater was also investigated at nanomolar levels over a range of pH (7.75–8.25) at 25°C in the presence of …

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Iron-oxidizing bacteria in marine environments: recent …

2018-7-4 · The oxidation of ferrous to ferric iron releases energy, which is harnessed by some iron-oxidizing prokaryotes. Ferrous iron is stable under anoxic conditions but can autoxidize in air. Some microbial communities that are unable to use solar energy via photosynthesis use energy from iron oxidation for CO 2 assimilation (Schwertmann and Cornell ...

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The oxidation kinetics of Fe(II) in seawater

1987-4-1 · The oxidation of Fe (II) has been studied as a function of pH (5 to 9), temperature (5 to 45°C), and salinity (0 to 35). The pseudo-first-order rate constant, k1, −d [Fe (II)] dt = k 1 [Fe (II)] in water and seawater was found to be a second degree function of pH over the pH range of 7.5 to 8.5 at 5°C and 6.0 to 8.0 at 25°C.

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Oxidation in Sea Water

2009-5-11 · A portion of these compounds withstands oxidation to non-toxic forms in air saturated water for considerable periods. 2. "Deep water" from the English Channel contains a catalyst, probably an iron compound, which increases the rate of oxidation of a number of easily oxidisable organic compounds.

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Kinetic model for Fe(II) oxidation in seawater in the …

2002-2-1 · A detailed kinetic model has been developed to describe the oxidation of Fe(II) in seawater in both the absence and the presence of natural organic material. Experimental data were collected using a luminol chemiluminescence-based method to measure Fe(II), assuming that both the inorganic and the organically complexed species were detected.

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Oxidative precipitation of groundwater‐derived …

2002-5-28 · The oxidation of ferrous-iron rich ground water in the bay''s subterranean estuary is the responsible mechanism. These iron oxide rich sands could act as a geochemical barrier by retaining and accumulating certain …

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Exploring the Effects of Organic Matter Characteristics on …

2022-1-25 · The iron(II) oxidation kinetic process was studied at 25 stations in coastal seawater of the Macaronesia region (9 around Cape Verde, 11 around the Canary Islands, and 5 around Madeira). In a physicochemical context, experiments were carried out to study the pseudo-first-order oxidation rate constant (k′, min–1) over a range of pH (7.8, 7.9, 8.0, and 8.1) and …

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Kinetics of hydrolysis and precipitation of ferric iron in …

2003-9-1 · Abstract. We have investigated the kinetics of iron hydrolysis and precipitation and dissolution of the solid formed via a novel chemical method, namely accessibility of iron to the fungal siderophore desferrioxamine B (DFB), with spectrophotometric detection of the ferrioxamine complex. Our results support a mechanism in which precipitation of ...

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The oxidation kinetics of Fe(II) in seawater

1987-4-1 · Kinetics of iron (II) oxidation in seawater of various pH. Mar. Chem., 15 (1984), pp. 279-280. Article Download PDF View Record in Scopus Google Scholar. Davison and Seed, 1983. W Davison, G Seed. The kinetics of the oxidation of ferrous iron in synthetic and natural waters. Geochim. Cosmochim.

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CORROSION RATE OF COPPER AND IRON IN SEAWATER …

2022-7-28 · ronment. Seawater media and oxygen-rich moist atmosphere are the non-inert envi-ronment example for iron and copper. Ac-tually, based on standard oxidation potential data (Skoog, 1985), iron and copper can not corrode in water media only (1997). Expe-rimental results reported by deMeo (1997) showed these facts. Iron and copper corrosion

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Iron Speciation in Seawater

2016-11-26 · The speciation of iron in seawater is an extremely complex issue for which there is no ideal logical presentation. The chapter proposes a chemical species‐based approach that has the advantage of starting with well‐defined chemical concepts, such as oxidation states, organic and inorganic domains, thermodynamics and kinetic laws.

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The Availability of Iron in Seawater: A Perspective

2022-2-20 · of iron that might constitute biologically available metal, and a methodological approach for estimating iron availability in seawater. From the few field data available, a specula­ tive account is offered on the in situ factors that may influence the availability of iron occurring in seawater. The Chemistry of Iron in Marine Waters

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Iron (Fe) and water

Seawater contains approximately 1-3 ppb of iron. The amount varies strongly, and is different in the Atlantic and the Pacific Ocean. Rivers contain approximately 0.5-1 ppm of iron, and groundwater contains 100 ppm. ... Iron removal from wastewater may be achieved by oxidation of binary iron to tertiary iron.

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Increasing concentrations of iron in surface waters as a …

2016-1-14 · The oxidation state of Fe is sensitive to changes in redox potential. While sparingly soluble Fe(III) dominates in oxic and circumneutral waters, highly soluble Fe(II) is the dominating species in anoxic waters, as a result of microbial Fe and sulfate reduction [ …

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Kinetics of iron(ii) oxidation in seawater of various pH

DOI: 10.1016/0304-4203(84)90024-0 Corpus ID: 95407137. Kinetics of iron(ii) oxidation in seawater of various pH @article{Davison1984KineticsOI, title={Kinetics of iron(ii) oxidation in seawater of various pH}, author={William G. Davison}, journal={Marine Chemistry}, year={1984}, volume={15}, pages={279-280} }

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Oxidation of iron (II) nanomolar with H2O2 in seawater

2005-1-1 · The oxidation of Fe (II) with H 2 O 2 has been studied in seawater by a number of authors. H 2 O 2 is an intermediate in the reduction of oxygen to water and can act as an oxidant in the reaction with Fe (II) ( Moffett and Zika, 1987 ). The H 2 O 2 in surface water is also generated by photochemical processes, due to the presence of organic ...

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Effect of Dissolved Natural Organic Matter on the Kinetics …

2003-9-27 · We have investigated the kinetics of Fe(II) oxygenation in seawater in the presence of a variety of natural organic materials obtained from vegetation near Moreton Bay, Queensland. Natural organic matter (NOM) was observed mostly to accelerate Fe(II) oxygenation, but in some cases oxidation was retarded. We fitted a previously developed kinetic model to the …

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Oxidation of iron (II) nanomolar with H2O2 in seawater — …

The oxidation of Fe(II) with H 2 O 2 at nanomolar levels in seawater have been studied using an UV-Vis spectrophotometric system equipped with a long liquid waveguide capillary flow cell. The effect of pH (6.5 to 8.2), H 2 O 2 (7.2 × 10-8 M to 5.2 × 10-7 M), HCO 3-(2.05 mM to 4.05 mM) and Fe(II) (5 nM to 500 nM) as a function of temperature (3 to 35 °C) on the oxidation of Fe(II) …

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Rates and Mechanism of Fe(II) Oxidation at Nanomolar …

1995-3-1 · This article is cited by 252 publications. J. Magdalena Santana-Casiano, David González-Santana, Quentin Devresse, Helmke Hepach, Carolina Santana-González, Birgit Quack, Anja Engel, Melchor González-Dávila. Exploring the Effects of Organic Matter Characteristics on Fe(II) Oxidation Kinetics in Coastal Seawater.

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Determination of iron in seawater

2001-8-31 · The determination of iron in seawater is a major challenge, although much progress has been made during the last two decades. ... The iron(III) oxidation state predominates in oxygenated waters and is highly insoluble through the formation of oxyhydroxides. Iron(II) is thermodynamically unstable in oxygenated seawater and is rapidly oxidised to ...

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Exploring the Effects of Organic Matter Characteristics …

2021-7-6 · KEYWORDS: iron(II), oxidation kinetics, Macaronesia, coastal seawater, CDOM, FDOM 1. INTRODUCTION Iron (Fe) is a trace element whose speciation and concentration in the marine environment are affected by multiple abiotic and biotic processes.1 Redox and complexation reactions control its solubility and therefore the fraction of

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Iron

2019-1-17 · The chemical speciation of iron may explain much of its anomalous behaviour. Iron is stable as the +III oxidation state in oxic seawater as Fe (OH) 2- . This form of iron is very insoluble and concenrations should be less than 200 pmol/kg (Millero, 1998). However, several studies (e.g. Rue and Bruland, 1995) have shown that an organic ligand ...

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A record of deep-ocean dissolved O2 from the oxidation …

2018-1-3 · Deep-ocean O2 concentrations over the past 3.5 billion years are estimated using the oxidation state of iron in submarine basalts and indicate that deep-ocean oxygenation occurred in the Phanerozoic.

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