X-irradiation of aqueous solutions of ethylenediamine tetraacetic acid (EDTA)

Bhattacharyya, S. N.; Kundu, K.P.

doi:10.1016/0020-7055(72)90006-x

Cited by 38 publications

(12 citation statements)

References 21 publications

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“…The decomposition of EDTA in neutral and acidic solution has been studied and the rates are greater than in basic solution, possibly because reaction with the OH radical is possible. In acidic or neutral solution, hydrogen atom abstraction by OH radical may occur from one of the EDTA acetyl groups [69]:…”

Section: The Radiation Chemistry Of Organic Chelating Agents In Aqueomentioning

confidence: 99%

“…(47) is a carbon-centered radical which can then add O 2 to form a peroxyl radical. Decomposition of the peroxyl radical results in the formation of formaldehyde and ethylenediaminetriacetic acid (ED3A), both measured products [69][70][71]:…”

Section: The Radiation Chemistry Of Organic Chelating Agents In Aqueomentioning

confidence: 99%

“…(47) may self-react to regenerate EDTA, and create ED3A and glyoxalic acid, also measured products [69,72]: (49) Alternately hydrogen atom abstraction can occur at the ethylene group that links the two acetate amines, resulting in the measured product nitriloacetic acid [73] shown in Eqs. (50)-(52):…”

Section: The Radiation Chemistry Of Organic Chelating Agents In Aqueomentioning

confidence: 99%

“…The reactions shown above in Eqs. (47)-(52) could also be initiated by hydrogen atom abstraction due to H radical [69] (k = 6.0 × 10 7 L mol −1 s −1 ) [74]. However, in basic solution H radical is also scavenged at a comparable rate [6]:…”

Section: The Radiation Chemistry Of Organic Chelating Agents In Aqueomentioning

confidence: 99%

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Radiation chemical effects on radiochemistry: A review of examples important to nuclear power

Mincher¹,

Mezyk

2009

Radiochimica Acta

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Radiolysis / Linear energy transfer / Redox reactions / Ligand degradation / Free radicals / Solvent extractionSummary. Radiochemistry deals with the chemistry of the radioactive elements. In the nuclear industry successful fuel reprocessing, high-level waste treatment, and long-term storage of spent fuel depend on an understanding of the radiochemistry of actinides and fission products in these settings. Radiation chemistry is concerned with the chemical effects of ionizing radiation, with the most common types of radiation encountered by the radiochemist being low linear energy transfer (LET) β − and γ radiation, and higher LET α radiation. These radiations can have profound and important effects on radiochemistry, including changes in metal oxidation states and degradation of the organic ligands designed to complex radioelements. This may occur by direct action of the incident radiation on compounds present with high abundance or by reaction with radiolytically produced reactive species for trace components, such as the complexing agents. This review examines the role of reactive species created in irradiated aqueous and organic solution and their effects on radiochemistry. The sources and nature of these reactive species are discussed. Examples of radiation chemical effects are provided related to solvent extraction of the actinides from acidic solution, metal complexation and technetium redox chemistry in alkaline tank waste, and the corrosion of spent fuel stored in repository brine.

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Section: The Radiation Chemistry Of Organic Chelating Agents In Aqueomentioning

confidence: 99%

Section: The Radiation Chemistry Of Organic Chelating Agents In Aqueomentioning

confidence: 99%

Section: The Radiation Chemistry Of Organic Chelating Agents In Aqueomentioning

confidence: 99%

Section: The Radiation Chemistry Of Organic Chelating Agents In Aqueomentioning

confidence: 99%

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Radiation chemical effects on radiochemistry: A review of examples important to nuclear power

Mincher¹,

Mezyk

2009

Radiochimica Acta

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“…(2) In order to determine the importance of this reaction the reaction rate constants were measured for several values of the ionic strength in the case of PbEDTA 2 " and CdEDTA 2 In addition for a number of other metal-EDTA complexes the rate constants were measured at a low value for the ionic strength. Because EDTA can be degraded during the irradiation [6] a small excess of EDTA was used. This made it necessary to measure the rate constant for the reaction between e~ and EDTA (3).…”

Section: Introductionmentioning

confidence: 99%

Rate Constants for the Reaction of e^- _aq with EDTA and Some Metal EDTA-Complexes

Buitenhuis¹,

Bakker²,

Stock³

et al. 1977

Radiochimica Acta

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The rate constants for the reaction e^ + EDTA were measured as a function of the pH by the pulse-radiolysis technique. Between pH = 6 and pH = 10 this rate constant can be represented by the equation k = 4.7 X 10 e X (fraction of HEDTA 3 ") + 1.0 X 10* X (fraction Hj EDTA 2 ~)M~1 s" 1 . Also the rate constants for reactions of e^j with the following metal-EDTA complexes were measured: CuEDTA 2 -, HgEDTA 2 CoEDTA 2 ", InEDTA", NiEDTA 2 GaEDTA", MnEDTA 2 ZnEDTA 2 -, CdEDTA 2 PbEDTA 2 -. Ionic strength variation indicates that the reacting ions are not hydrolized to an appreciable amount at pH = 11.5. It is found that some of the products show light absorption in the region between 300 and 400 nm.

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Rate constants for the reaction of OH radicals with some amino polycarboxylic acids

Dwibedy

Dey

Naik

et al. 2000

Int. J. Chem. Kinet.

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Rate constants of OH radical reaction with some amino polycarboxylic acids (APCAs) such as EDTA, DTPA, HEDTA, NTA, and HIDA have been determined at different pHs using pulse radiolysis competition kinetics method with thiocyanate as the reference solute. The rate constants varied with pH (possibly due to their various pKs) and the plots of rate constants vs. pH are given. Rate constants for OH radical reaction with the various acid-base forms of these amino polycarboxylic acids are estimated from the plateau values in the plots.

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X-irradiation of aqueous solutions of ethylenediamine tetraacetic acid (EDTA)

Cited by 38 publications

References 21 publications

Radiation chemical effects on radiochemistry: A review of examples important to nuclear power

Radiation chemical effects on radiochemistry: A review of examples important to nuclear power

Rate Constants for the Reaction of e^- _aq with EDTA and Some Metal EDTA-Complexes

Rate constants for the reaction of OH radicals with some amino polycarboxylic acids

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X-irradiation of aqueous solutions of ethylenediamine tetraacetic acid (EDTA)

Cited by 38 publications

References 21 publications

Radiation chemical effects on radiochemistry: A review of examples important to nuclear power

Radiation chemical effects on radiochemistry: A review of examples important to nuclear power

Rate Constants for the Reaction of e- aq with EDTA and Some Metal EDTA-Complexes

Rate constants for the reaction of OH radicals with some amino polycarboxylic acids

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Rate Constants for the Reaction of e^- _aq with EDTA and Some Metal EDTA-Complexes