The Effects of Organic Impurities on the Partitioning of Iodine

Lutz, J.B.; Kelly, J.L.

doi:10.13182/nt88-a34067

Cited by 8 publications

(6 citation statements)

References 3 publications

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“…It was found that including reaction [5], with a reaction rate constant of ks 5 5.0 x lo9 M-' s-' , had no effect on the (SCN)2'-growth profile. However, if reaction [6] occurred with the same rate constant, then the yield of (SCN)2'-was considerably reduced, and the (SCN)2' -growth rate was far faster. In contrast, the effect of including reaction [7] was to increase the yield, and make the overall growth significantly slower.…”

Section: Reaction Of Hydroxyl Radicalmentioning

confidence: 99%

Rate constant and activation energy determination for reaction of e⁻_(aq) and ^•OH with 2-butanone and propanal

Mezyk¹

1994

Can. J. Chem.

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The techniques of pulse radiolysis and absorption spectroscopy have been used to determine kinetic parameters for e−(aq) and •OH reaction with 2-butanone and propanal. The temperature dependent rate constants for hydrated electron reaction are given by ln k(T) = (28.96 ± 0.06) − (1970 ± 20)/T' (2-butanone, 275–343 K), and ln k(T) = (29.2 ± 0.2) − (2160 ± 50)/T (propanal, 275–310 K), where the given uncertainties are 1σ and only represent precision, and the rate constants are in units of M−1 s−1. For hydroxyl radical reaction over the same temperature ranges. ln k(T) = 25.32 ± 0.02) − (1460 ± 40)/T (2-butanone) and ln k(T) = (32.73 ± 0.03) − (3310 ± 100)/T (propanal).

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Section: Reaction Of Hydroxyl Radicalmentioning

confidence: 99%

Rate constant and activation energy determination for reaction of e⁻_(aq) and ^•OH with 2-butanone and propanal

Mezyk¹

1994

Can. J. Chem.

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“…Volatilities of iodine species, which are generally measured by water-gas partitioning, have been studied by several investigators [40][41][42][43][44][45][46][47][48][49][50][51][52][53] under various conditions. The water-gas partition coefficient (PC) is defined as the ratio of the concentration of an iodine species in water to that in the gas phase.…”

Section: Volatilities Of Iodine Speciesmentioning

confidence: 99%

“…Some studies on the effects of gamma radiation and organic impurities as a function of time have also been reported. [50][51][52] Hydrolyses of iodine species would certainly decrease the concentration of gaseous species and enhances the water-gas partitioning, as shown by the following water hydrolysis equilibrium of I 2 as an example.…”

Section: Volatilities Of Iodine Speciesmentioning

confidence: 99%

Reassessment of Reactor Coolant and Iodine Chemistry under Accident Conditions

Lin

Chao

2009

Journal of Nuclear Science and Technology

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Under severe accident conditions, the chemistry of reactor coolant could be significantly different from that under normal operating conditions. Injection of standby liquid control (SBLC) solution, release of fission product cesium (Cs) from damaged fuel rods, and addition of NaOH and Na 2 S 2 O 3 in spray water will certainly enhance the alkalinity of water. In addition, oxidation of fuel cladding (zircaloy) by hightemperature water and steam would produce a significant amount of hydrogen, and hydrogen in water could effectively suppress water radiolysis and make the water more reducing. It is believed that the chemistry and transport behavior of iodine released from damaged fuel rods are strongly dependent on the chemistry of reactor water under accident conditions, and it is expected that the released iodine will most likely remain in nonvolatile forms in water. The chemistry of reactor coolant and the activities of iodine released from a damaged core are reviewed in detail in this paper.

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“…Iodine is a fission product, the radioisotope of which is 129 I in reprocessing (period of 1.6 × 10 7 years). This compound is mainly present as I 2 ; however, a small fraction, lower than 6%, has been identified as organic iodides. , The detected compounds are short-chain alkyl iodides, the most abundant being methyl iodide. − They mainly result from free-radical reactions of I 2 with impurities from the recycled nitric acid or traces of oil carried out by the airlifts. − …”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4] They mainly result from free-radical reactions of I 2 with impurities from the recycled nitric acid or traces of oil carried out by the airlifts. [5][6][7] The alkaline scrubbing solution causes dismutation of volatile I 2 into nonvolatile Iand IO 3 -, and hydrolysis of nitrogen oxides into nitrites, but is ineffective in trapping alkyl iodides.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of the Reaction of Methyl Iodide with Hydroxylamine in an Aqueous Solution within the Framework of Nuclear Spent Fuel Reprocessing

Coumes

Chopin-Dumas

Devisme

2001

Ind. Eng. Chem. Res.

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Within the scope of investigations carried out to find a new reactant for dissolution off-gas scrubbing in spent fuel reprocessing, this paper reports the study of the reaction between hydroxylamine and methyl iodide in an aqueous solution. The products with an excess of hydroxylamine were ascribed to be iodide and N-methylhydroxylamine. The main contribution of this work was the kinetics investigations from 25 to 55 °C within a pH range of 2.2-13.6 (analytical data obtained by ion chromatography), operating conditions for which no sufficient data were available from the literature. NH 3 OH + was found to be nonreactive. The NH 2 OH/ CH 3 I and NH 2 O -/CH 3 I reactions, the second one having not been investigated so far, were first order with respect to each reactant, with second-order rate constants of respectively (4.30 ( 0.25) × 10 -3 and (2.05 ( 0.25) × 10 -1 mol -1 L s -1 at 55 °C and activation energies of 98.3 ( 3.4 and 67.4 ( 2.9 kJ mol -1 . These results are consistent with estimations from a Bro ¨nsted correlation established for nitrogen nucleophiles. Edwards and Swain-Scott nucleophilic constants, not reported in the literature up to now, were calculated in water at 25 °C and compared to hydrazine and inorganic anions of potential interest within the scope of spent fuel reprocessing. An Ampac computational study of the transition state of the NH 2 OH/CH 3 I reaction was performed in gaseous media.

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The Effects of Organic Impurities on the Partitioning of Iodine

Cited by 8 publications

References 3 publications

Rate constant and activation energy determination for reaction of e⁻_(aq) and ^•OH with 2-butanone and propanal

Rate constant and activation energy determination for reaction of e⁻_(aq) and ^•OH with 2-butanone and propanal

Reassessment of Reactor Coolant and Iodine Chemistry under Accident Conditions

Kinetics of the Reaction of Methyl Iodide with Hydroxylamine in an Aqueous Solution within the Framework of Nuclear Spent Fuel Reprocessing

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The Effects of Organic Impurities on the Partitioning of Iodine

Cited by 8 publications

References 3 publications

Rate constant and activation energy determination for reaction of e−(aq) and •OH with 2-butanone and propanal

Rate constant and activation energy determination for reaction of e−(aq) and •OH with 2-butanone and propanal

Reassessment of Reactor Coolant and Iodine Chemistry under Accident Conditions

Kinetics of the Reaction of Methyl Iodide with Hydroxylamine in an Aqueous Solution within the Framework of Nuclear Spent Fuel Reprocessing

Contact Info

Product

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Rate constant and activation energy determination for reaction of e⁻_(aq) and ^•OH with 2-butanone and propanal

Rate constant and activation energy determination for reaction of e⁻_(aq) and ^•OH with 2-butanone and propanal