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Dissolution and diffusion of oxygen in deaerated water and escape of oxygen to the atmosphere from an oxygen saturated aqueous solution / Surajdevprakash B. Dhiman in Industrial & engineering chemistry research, Vol. 48 N° 9 (Mai 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 9 (Mai 2009) . - pp. 4312–4315 Titre : Dissolution and diffusion of oxygen in deaerated water and escape of oxygen to the atmosphere from an oxygen saturated aqueous solution : an investigation by a pulse radiolysis technique Type de document : texte imprimé Auteurs : Surajdevprakash B. Dhiman, Auteur ; Devidas B. Naik, Auteur Année de publication : 2009 Article en page(s) : pp. 4312–4315 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Oxygen  diffusion  Oxygen  dissolution  Hydrated  electrons  Pulse  radiolysis  technique Résumé : Fast reaction of hydrated electrons (eaq−) with oxygen has been used to determine the dissolution and diffusion of oxygen in water by monitoring the decay of eaq− at 700 nm. Hydrated electrons in the irradiated volume (7.5 cm below the surface) were generated by pulse radiolysis technique. Water was purged with high purity nitrogen to remove dissolved oxygen, and subsequently, the lifetime of the eaq− formed on pulse radiolysis was determined at various times after exposure to atmosphere. The lifetime of the eaq− measured in the irradiated volume was negligibly affected until ∼60 min after the water was exposed to atmosphere. Then onward, the lifetime of eaq− decreased as a result of oxygen reaching the irradiated volume. In another set of experiments, reaction of methyl viologen radical cations (generated by the reaction of eaq− with methyl viologen) with oxygen (k = 4.3 × 108 dm3 mol−1 s−1) was investigated to find out how the dissolved oxygen escapes from oxygen-saturated solution to the atmosphere by observing the increase in the lifetime of methyl viologen radical cations. In 140 min, concentration of oxygen comes down to the value present in the ambient aerated solution. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801928u [article] Dissolution and diffusion of oxygen in deaerated water and escape of oxygen to the atmosphere from an oxygen saturated aqueous solution : an investigation by a pulse radiolysis technique [texte imprimé] / Surajdevprakash B. Dhiman, Auteur ; Devidas B. Naik, Auteur . - 2009 . - pp. 4312–4315. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 9 (Mai 2009) . - pp. 4312–4315 Mots-clés : Oxygen  diffusion  Oxygen  dissolution  Hydrated  electrons  Pulse  radiolysis  technique Résumé : Fast reaction of hydrated electrons (eaq−) with oxygen has been used to determine the dissolution and diffusion of oxygen in water by monitoring the decay of eaq− at 700 nm. Hydrated electrons in the irradiated volume (7.5 cm below the surface) were generated by pulse radiolysis technique. Water was purged with high purity nitrogen to remove dissolved oxygen, and subsequently, the lifetime of the eaq− formed on pulse radiolysis was determined at various times after exposure to atmosphere. The lifetime of the eaq− measured in the irradiated volume was negligibly affected until ∼60 min after the water was exposed to atmosphere. Then onward, the lifetime of eaq− decreased as a result of oxygen reaching the irradiated volume. In another set of experiments, reaction of methyl viologen radical cations (generated by the reaction of eaq− with methyl viologen) with oxygen (k = 4.3 × 108 dm3 mol−1 s−1) was investigated to find out how the dissolved oxygen escapes from oxygen-saturated solution to the atmosphere by observing the increase in the lifetime of methyl viologen radical cations. In 140 min, concentration of oxygen comes down to the value present in the ambient aerated solution. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801928u