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dissolution of iron oxides

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(PDF) Dissolution of Iron Oxides researchgate

Therefore, for the purpose of many investigations, the selective dissolution of iron oxides from the silicate clays, is an essential feature. Iron oxide removal procedures have been routinely...

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Solubility and dissolution of iron oxides SpringerLink

Dissolution of Fe oxides takes place either by protonation, complexation or, most important, by reduction. Numerous dissolution rate studies with various FeIII oxides were conducted in strong mineral acids (protonation) and they have shown that besides the Fe oxide species, crystal size and/or crystal order and substitution are important determinative factors.

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Solubility and dissolution of iron oxides JSTOR

Solubility and dissolution of iron oxides U. SCHWERTMANN Lehrstuhl für Bodenkunde,Technische Universität München, D -8050 Freising-Weihenstephan, Germany Key words: Al substitution, complexation, dissolution, ferrihydrite, goethite, hematite, iron oxides, microbial reduction, protonation, soils, solubility Abstract

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New formulations for iron oxides dissolution ScienceDirect

01-12-1991  INTRODUCTION The dissolution of iron (III) oxides is a very important technological pro- cess with applications in several areas; such as: ( 1 ) leaching of oxides ores in hydrometallurgy; (2) removal of iron oxides from non-metallic minerals, such as kaolin and silica, of importance for the glass and ceramic manufacturing industry; ( 3 ) removal of the scale from a metal prior to rolling; (4) removal

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Mechanisms of dissolution of iron oxides in aqueous oxalic

01-09-1996  The dissolution of pure iron oxides by organic acids has been extensively reviewed. The mechanism of dissolution comprises three distinct steps: (1) adsorption of organic ligands on the iron oxide surface; (2) non-reductive dissolution; and (3) reductive dissolution.

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Freezing-Enhanced Dissolution of Iron Oxides: Effects of

Dissolution of iron from mineral dust particles greatly depends upon the type and amount of copresent inorganic anions. In this study, we investigated the roles of sulfate, chloride, nitrate, and perchlorate on the dissolution of maghemite and lepidocrocite in ice under both dark and UV irradiation and compared the results with those of their aqueous counterparts. After 96 h of reaction, the

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Accelerated dissolution of iron oxides in ice

The dissolution of iron oxides in ice was investigated under dark condi- tion to find that the dissolution can be markedly enhanced in ice via a non-reductive 25 process even in

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Solubility and dissolution of iron oxides SpringerLink

Abstract. In most soils, FeIII oxides (group name) are the common source of Fe for plant nutrition. Since this Fe has to be supplied via solution, the solubility and the dissolution rate of the Fe oxides are essential for the Fe supply.

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Solubility and dissolution of iron oxides JSTOR

Solubility and dissolution of iron oxides U. SCHWERTMANN Lehrstuhl für Bodenkunde,Technische Universität München, D -8050 Freising-Weihenstephan, Germany Key words: Al substitution, complexation, dissolution, ferrihydrite, goethite, hematite, iron oxides, microbial reduction, protonation, soils, solubility Abstract

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Iron oxide dissolution and solubility in the presence of

promoted or ligand-promoted iron oxide dissolution. The adsorption of siderophores to oxide surfaces also induces a direct siderophore-promoted surface-controlled dissolution mechanism. The efficiency of siderophores for increasing the solubility and dissolution kinetics of iron oxides are compared to other natural and anthropogenic ligands. Key words.

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Solubility and dissolution of iron oxides Semantic Scholar

Solubility and dissolution of iron oxides. In most soils, FeIII oxides (group name) are the common source of Fe for plant nutrition. Since this Fe has to be supplied via solution, the solubility and the dissolution rate of the Fe oxides are essential for the Fe supply.

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Freezing-Enhanced Dissolution of Iron Oxides: Effects of

Sulfuric acid was the most efficient in producing labile iron under dark condition, whereas hydrochloric acid induced the most dissolution of the total and ferrous iron in the presence of light. This ice-induced dissolution result was also confirmed with Arizona Test Dust (AZTD).

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Solubility and dissolution of iron oxides SpringerLink

Schwertmann U. (1991) Solubility and dissolution of iron oxides. In: Chen Y., Hadar Y. (eds) Iron Nutrition and Interactions in Plants. Developments in Plant and Soil Sciences, vol 43. Springer, Dordrecht. https://doi/10.1007/978-94-011-3294-7_1. DOI https://doi/10.1007/978-94-011-3294-7_1; Publisher Name Springer, Dordrecht

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Dissolution of Iron Oxides ResearchGate

2006] DISSOLUTION OF IRON OXIDES 3 dissolution of iron oxides. Borggaard (1982) observed that hematite was dissolved to the extent of only 50% after DCB treatment. Dissolution of goethite, hematite

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(PDF) Dissolution of Iron Oxides and Oxyhydroxides in

Dissolved iron levels reached 0.69 mg/L and 0.82 mg/L, respectively (Table 2). α-Fe 2 O 3 also leached, but the extent of iron leaching was considerably less; of all iron oxides, hematite is the...

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Accelerated dissolution of iron oxides in ice

The dissolution of iron oxides in ice was investigated under dark condi- tion to find that the dissolution can be markedly enhanced in ice via a non-reductive 25 process even in the absence of light.

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Dissolution of Iron Oxides and Oxyhydroxides in

01-08-1981  Dissolution of Iron Oxides and Oxyhydroxides in Hydrochloric and Perchloric Acids Abstract. The dissolution of synthetic magnetite, maghemite, hematite, goethite, lepidocrocite, and akaganeite was Резюме. Resümee. Synthetischer Magnetit, Maghemit, Haematit, Goethit, Lepidokrokit, und Akaganeit

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Iron mineral dissolution releases iron and associated

10-12-2020  The maximum mass ratio of organic carbon to iron of 0.22, based on the maximal sorption capacity of reactive iron oxides for natural OM 4,36, as has

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Freezing-Enhanced Dissolution of Iron Oxides: Effects of

This unique phenomenon observed in ice might be related to the freeze concentration of protons, iron oxides, and inorganic anions in the liquid-like ice grain boundary region. These results suggest that the ice-enhanced dissolution of iron oxides can be a potential source of bioavailable iron, and the acid anions critically influence this process.

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Solubility and dissolution of iron oxides Semantic Scholar

Solubility and dissolution of iron oxides. In most soils, FeIII oxides (group name) are the common source of Fe for plant nutrition. Since this Fe has to be supplied via solution, the solubility and the dissolution rate of the Fe oxides are essential for the Fe supply.

get price

Solubility and dissolution of iron oxides SpringerLink

Schwertmann U. (1991) Solubility and dissolution of iron oxides. In: Chen Y., Hadar Y. (eds) Iron Nutrition and Interactions in Plants. Developments in Plant and Soil Sciences, vol 43. Springer, Dordrecht. https://doi/10.1007/978-94-011-3294-7_1. DOI https://doi/10.1007/978-94-011-3294-7_1; Publisher Name Springer, Dordrecht

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Dissolution of Iron Oxides ResearchGate

2006] DISSOLUTION OF IRON OXIDES 3 dissolution of iron oxides. Borggaard (1982) observed that hematite was dissolved to the extent of only 50% after DCB treatment. Dissolution of goethite, hematite

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Accelerated dissolution of iron oxides in ice

iron oxides and in the presence of strong iron binding lig-ands. The enhanced dissolution of iron oxides in ice is mainly ascribed to the “freeze concentration effect”, which concen-trates iron oxide particles, organic ligands, and protons in the liquid like ice grain boundary region

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Selective Dissolution of Magnetic Iron Oxides in the Acid

The iron oxides were taken from a study by Hartstra (1982a), furthermore, we prepared fine-grained iron oxides according to the method described in Schwertmann Cornell (1991). Table 2 shows the properties 59 Selective Dissolution of Magnetic Iron Oxides Table 2: Properties and origin of the

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Dissolution of iron from iron (Hydr)Oxides by mugineic acid

Iron (hydr)oxides. Various synthetic methods were used to obtain the 22 Fe (hydr)­ oxides (Table 1). The Fe (hydr)oxides were deionized by decantation ot dialysis with deionized water, and then either air-dried after washing with acetone or alcohol, or freeze­ dried. One sample (sample No.2, G-w) was kindly provided by Dr. S.-I. Wada.

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ACP Accelerated dissolution of iron oxides in ice

The iron dissolution was most pronounced with high surface area iron oxides and in the presence of strong iron binding ligands. The enhanced dissolution of iron oxides in ice is mainly ascribed to the "freeze concentration effect", which concentrates iron oxide particles, organic ligands, and protons in the liquid like ice grain boundary region and accelerates the dissolution of iron oxides.

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Dissolution of Iron from Oxides in a Solution of Citric

In this work, the dissolution of iron from a kaolinitic mineral (Veracruz, México) is compared with that from an iron ore (Michoacán, México), a specular hematite (México), a magnetite (southeastern Utah, USA) and a hematite (from Arizona, USA), using sodium thiosulfate and citric acid, as the reducing and complexing agents, respectively.

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Iron mineral dissolution releases iron and associated

10-12-2020  The maximum mass ratio of organic carbon to iron of 0.22, based on the maximal sorption capacity of reactive iron oxides for natural OM 4,36, as has

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