Interactions of metal hydrous oxides with chelating agents. I. β-FeOOH—EDTA

Rubio, Jorge; Matijević, Egon

doi:10.1016/0021-9797(79)90299-6

Cited by 140 publications

(51 citation statements)

References 15 publications

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“…This agrees with previous investigations that demonstrated the rate of dissolution reaches an apparent maximum at high adsorbed EDTA concentrations (Rubio and Matijevic 1979;Chang and Matijevic 1983;Ballesteros et al 1998). …”

Section: Dependence Of Dissolution Rate On Edta Concentrationsupporting

confidence: 93%

“…At pH(23°C) ≥ 10.24, adsorption of EDTA onto Amasteel is inhibited resulting in surface complexation by hydroxyl ions or the release of iron hydroxide complexes into solution, which may undergo secondary precipitation as iron oxyhydroxides (Rubio and Matijevic 1979). Chang and Matijevic, (1983) proposed a dissolution mechanism for hematite in the presence of EDTA where, in acids, dissolution proceeds through adsorption of EDTA to the surface followed by removal of Fe-EDTA complexes, and in alkaline solutions, Fe ions released into solution react with either aqueous hydroxide or chelating ions.…”

Section: Dependence Of Dissolution Rate On Edta Concentrationmentioning

confidence: 99%

“…Instead, the speciation of Fe(II) is controlled by the concentration of EDTA (Santana-Casiano et al 2000). Adsorption of EDTA onto goethite (Stumm 1997;Rubio and Matijevic 1979;Nowack and Sigg 1996;Nowack and Sigg 1997;Rueda et al 1985), lepidocrocite (Bondietti et al 1993;Rubio and Matijevic 1979), magnetite (Blesa et al 1984), hematite (Chang and Matijevic 1983) and hydrous ferric oxide (Nowack and Sigg 1997) Figure 5-3 illustrates the calculated dissolution rate of Amasteel in solutions with pH(23°C) = 9.0, 11.0, and 12.0 (Table 3- (Table 5-1). This suggests that complexation of aqueous iron by EDTA and hydroxyl ions at pH(23°C) = 10.0 results in further release of iron from the solid increasing the apparent dissolution rate (Chang and Matijevic 1983).…”

Section: Dependence Of Dissolution Rate On Edta Concentrationmentioning

confidence: 99%

“…This suggests that complexation of aqueous iron by EDTA and hydroxyl ions at pH(23°C) = 10.0 results in further release of iron from the solid increasing the apparent dissolution rate (Chang and Matijevic 1983). However, for solution with pH(23°C) values between 11.0 and 12.0, the apparent dissolution rate of Amasteel is inversely dependent on the concentration of hydroxide and is influenced by the formation of secondary iron oxyhydroxide phases (Bondietti et al 1993;Rubio and Matijevic 1979). …”

Section: Dependence Of Dissolution Rate On Edta Concentrationmentioning

confidence: 99%

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Corrosion of Metal Inclusions In Bulk Vitrification Waste Packages

Bacon¹,

Pierce²,

Wellman³

et al. 2006

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SummaryThe primary purpose of the work reported here is to analyze the potential effect of the release of technetium (Tc) from metal inclusions in bulk vitrification (BV) waste packages once they are placed in the Integrated Disposal Facility (IDF). As part of the strategy for immobilizing waste from the underground tanks at Hanford, selected wastes will be immobilized using BV. During analyses of the glass produced in engineering-scale tests, metal inclusions were found in the glass product. This report contains the results from experiments designed to quantify the corrosion rates of metal inclusions found in the glass product from Test ES-32B (AMEC 2005) and simulations designed to compare the rate of Tc release from the metal inclusions to the release of Tc from glass produced with the BV process. Due to the probability of oxidizing conditions surrounding the waste packages in the IDF, in the simulations the Tc in the metal inclusions and the glass is conservatively assumed to be released congruently as soluble TcO 4 -. The experimental results and modeling calculations (Bacon and McGrail 2005) show that the metal corrosion rate will, under all conceivable conditions at the IDF, be dominated by the presence of the passivating layer and corrosion products on the metal particles. As a result, the release of Tc from the metal particles at the surfaces of fractures in the glass releases at a rate similar to the Tc present as a soluble salt (McGrail et al. 2003;Pierce et al. 2005). The release of the remaining Tc in the metal is controlled by the dissolution of the glass matrix.The dissolution kinetics of iron [Fe(0)] was quantified under conditions of constant dissolved O 2 [O 2 (aq)] and in solutions that minimized the formation of a passive film on the metal surface. These tests were performed to determine the forward reaction rate for the metal inclusions in the BV glass. Single-pass flow through (SPFT) tests were conducted over the pH(23°C) range from 7.0 to 12.0 and temperature range from 23°C to 90°C. The presence of EDTA minimized the formation of a passive film and Fe-bearing secondary phase(s) during testing allowing us to determine the forward dissolution rate. These results indicate that the corrosion of Fe(0) is relatively insensitive to pH and temperature and the forward rate is 3 to 4 orders of magnitude higher than when a passive film and corrosion products are present. Tests conducted with Amasteel (a low carbon steel non-radioactive surrogate) and ES-32B metal indicated that the forward dissolution rates for both metals were similar, if not identical. In other words, the presence of P and 99 Tc in the ES-32B metal appeared to have little effect on the forward dissolution rate. These results indicate that the corrosion rate of the ES-32B metal at repository relevant conditions was not significantly less than the surrogate metal. Because the effects of temperature (E a = 15 ±5 kJ/mol at pH(23°C) = 9.0 based on Fe release from ES-32B metal) and solution pH (η = -0.13 ±0.02 at 70°C based on Fe releas...

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Section: Dependence Of Dissolution Rate On Edta Concentrationsupporting

confidence: 93%

Section: Dependence Of Dissolution Rate On Edta Concentrationmentioning

confidence: 99%

Section: Dependence Of Dissolution Rate On Edta Concentrationmentioning

confidence: 99%

Section: Dependence Of Dissolution Rate On Edta Concentrationmentioning

confidence: 99%

See 2 more Smart Citations

Corrosion of Metal Inclusions In Bulk Vitrification Waste Packages

Bacon¹,

Pierce²,

Wellman³

et al. 2006

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“…At pHs from 4 to 7, crystalline iron oxides are not soluble in EDTA (Aguilera andJackson 1953, Rubio andMatijevic 1979). Very long extraction (90 days) by EDTA at pH 4.4-6.0, proposed for the extraction of ferrihydrite (Borggaard 1976(Borggaard , 1979, does not dissolve more iron than does acid oxalate (pH 3.0) during 4-5 hours (Borggaard 1976).…”

Section: Discussionmentioning

confidence: 99%

Extractable aluminium, iron and manganese in mineral soils: III Comparison of extraction methods

Niskanen

1989

AFSci

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Abstract. The extractability of soil Al, Fe and Mn were studied in 102 mineral soil samples. The extractants were 0.05 M oxalate (pH 2.9), 0.05 M K 4P 2 0 7 (pH 10), 0.02 M EDTA (pH 5.3) and 1 M CH 3 COONH 4 (pH 4.8). In the group of clay and silt soils (n = 51), the Al extracted by the four extractants correlated closely; the r values ranged from o.9l*** to o.96***; in coarser soils (n = 51) the r values ranged from 0.42* to o.B2***. In clay and silt soils, the organic carbon content and soil pH together explained 50 % of the variation in oxalateextractable Al, 70 % of the variation in pyrophosphate-extractable Al, 53 % of the variation in pyrophosphate-extractableFe and 56 % of the variation in acetate-extractable Al. The clay and organic carbon contents together with soil pH explained 77 % of the variation in EDTAextractable Al in clay and silt soils. In coarse soils, the extractable metals were not closely related to the soil characteristics.

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Verfahren zur Verhinderung von Verockerungserscheinungen an Steigleitungen, Filterbrunnen, Brunnenelementen und anderen wasserführenden Objekten. Teil 1: Gegenwärtiger Stand und theoretische Grundlagen

Fischer¹,

Reißig²,

Bach³

et al. 1990

Acta hydrochim. hydrobiol.

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Verfahren zur Verhinderung yon Veroekerungserscheinungen an Steigleitungen, Filterbrunnen, Brunnenelementen und anderen wasserfiihrenden Objekten. Teil 1: Gegenwartiger Stand und theoretische Grundlagen ,Summary: The technical state of development for the reduction or prevention of the iron clogging of water supply plants is presented. The iron-clogging mechanism is discussed from the angle of colloid chemistry, and adsorption processes a t the metal/water interface are paid special attention to. The basis is constituted by the pH-dependent hydrolysis of the surface hydroxide groups of the metal wall and the pH-dependent existence of hydroxide, chloride and sulphate complexes of the bi-and trivalent iron ions dissolved in water.

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Interactions of metal hydrous oxides with chelating agents. I. β-FeOOH—EDTA

Cited by 140 publications

References 15 publications

Corrosion of Metal Inclusions In Bulk Vitrification Waste Packages

Corrosion of Metal Inclusions In Bulk Vitrification Waste Packages

Extractable aluminium, iron and manganese in mineral soils: III Comparison of extraction methods

Verfahren zur Verhinderung von Verockerungserscheinungen an Steigleitungen, Filterbrunnen, Brunnenelementen und anderen wasserführenden Objekten. Teil 1: Gegenwärtiger Stand und theoretische Grundlagen

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