Linear accelerator for radiation chemistry research at Notre Dame

Whitham, K.; Lyons, S.; Miller, R.H.; Nett, D.; Treas, P.; Zante, A.; Fessenden, Richard W.; Thomas, M.D.; Wang, Y.

doi:10.1109/pac.1995.504588

Cited by 47 publications

(47 citation statements)

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“…Details of the equipment and data analysis have been given previously (22)(23)(24). Solution flow rates in the kinetic experiments were adjusted so that each pulse irradiation was performed on a fresh sample, and multiple traces (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15) were averaged to produce a single kinetic trace.…”

Section: Methodsmentioning

confidence: 99%

Bimolecular Rate Constant Determination for the Reaction of Hydroxyl Radicals with Domoic and Kainic Acid in Aqueous Solution

Cooper

Mezyk

2009

Environ. Sci. Technol.

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Bimolecular rate constants for the hydroxyl radical, .OH, reaction with domoic acid, kainic acid, and several model compounds were determined using electron pulse radiolysis and transient absorption spectroscopy. These oxidation rate constants were determined as (9.22 +/- 0.60) x 10(9) M(-1) s(-1) and (2.46 +/- 0.19) x 10(9) M(-1) s(-1), for domoic acid and kainic acid, respectively. Model compound rate constant measurements suggested that the conjugated double bond of the C4 substituent of domoic acid, and the double bond in kainic acid, were the preferential initial site of .OH reaction, which would destroy the conjugation and/or molecular conformation of these toxins. These reaction rate constants were also used to determine potential persistence in natural water systems, however the calculated half-life for domoic acid of approximately 34 days implies that significant photodegradation via .OH reaction mechanisms is unlikely.

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Section: Methodsmentioning

confidence: 99%

Bimolecular Rate Constant Determination for the Reaction of Hydroxyl Radicals with Domoic and Kainic Acid in Aqueous Solution

Cooper

Mezyk

2009

Environ. Sci. Technol.

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“…All sample solutions were prepared in water filtered through a Millipore Milli-Q system constantly illuminated by a UV lamp to maintain total organic carbon levels below 13 μg/L, as measured by an on-line analyzer. The linear accelerator (LINAC) electron pulse radiolysis system at the Radiation Laboratory, University of Notre Dame, was used for the hydrated electron and hydroxyl radical rate constant determinations (16). During the irradiation process, the solution vessels were bubbled with only the minimum amount of gas necessary to prevent air ingress, to minimize loss of the solute.…”

Section: Methodsmentioning

confidence: 99%

Free Radical Chemistry of Advanced Oxidation Process Removal of Nitrosamines in Waters

Mezyk

Landsman

Swancutt

et al. 2008

ACS Symposium Series

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Carcinogenic nitrosamines, notably N-nitrosodimethylamine (NDMA), have been found in many water environments. Of major concern is the finding that NDMA can be formed under water disinfection conditions, from the reactions of chlorine or chloramines with dissolved dimethylamine, unsymmetrical 1,1-dimethylhydrazine or natural organic matter. The removal of nitrosamines from water by standard treatments is difficult, with neither activated carbon absoption or aeration stripping being efficient. To establish the feasibility of using free--radical-based advanced oxidation processes (AOPs) for the destructive removal of nitrosamines in waters, we have investigated their oxidative and reductive chemistry. Rate constants for the reactions of the hydroxyl radical and hydrated electron using electron pulse radiolysis, and removal efficiencies under continuous 60 Co irradiation, have been determined for some low-molecular weight alkyl/aryl substituted species. Mechanistic insight for the reaction of these two AOP radicals has been obtained from observed structure-reactivity relationships.

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“…16 Dosimetry was based on the oxidation of SCN -to (SCN) 2 -• (G value ) 6 in N 2 O-saturated aqueous solutions. The G value denotes the number of species generated per 100 eV, or the approximate micromolar concentration per 10 J of absorbed energy).…”

Section: Methodsmentioning

confidence: 99%

Spectral Characterization of the One-Electron Oxidation Product of cis-Bis(isothiocyanato)bis(4,4‘-dicarboxylato-2,2‘-bipyridyl) Ruthenium(II) Complex Using Pulse Radiolysis

Das

Kamat

1998

J. Phys. Chem. B

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The spectral characterization of the oxidized form of (ruthenium(II) cis-di(isothiocyanato)bis(4,4′-dicarboxy-2,2′-bipyridyl), (commonly known as N3-dye) in aqueous solution is made by reacting the title compound with pulse radiolytically generated radicals N 3 • and Br 2 -• . The one-electron oxidized form of Ru(II)-dye initially formed in both these oxidation reactions shows absorption maxima at 320 and 740 nm. Following radiolysis, the one-electron oxidized form of Ru(II)-dye undergoes further transformations to yield a stable product that exhibits a characteristic absorption maximum at 440 nm. Our preliminary results provide the spectral evidence for the formation of two different species that follow the oxidation of Ru(II)-dye.

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Linear accelerator for radiation chemistry research at Notre Dame

Cited by 47 publications

References 0 publications

Bimolecular Rate Constant Determination for the Reaction of Hydroxyl Radicals with Domoic and Kainic Acid in Aqueous Solution

Bimolecular Rate Constant Determination for the Reaction of Hydroxyl Radicals with Domoic and Kainic Acid in Aqueous Solution

Free Radical Chemistry of Advanced Oxidation Process Removal of Nitrosamines in Waters

Spectral Characterization of the One-Electron Oxidation Product of cis-Bis(isothiocyanato)bis(4,4‘-dicarboxylato-2,2‘-bipyridyl) Ruthenium(II) Complex Using Pulse Radiolysis

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