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|a 10.2166/wst.2024.167
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|a pubmed24n1503.xml
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|a DE-627
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|a eng
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|a Albarrán, Guadalupe
|e verfasserin
|4 aut
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|a Radiolytic degradation of 4-hydroxybenzoate in aerated and deoxygenated aqueous solutions
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|c 2024
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|a Text
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|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Completed 16.08.2024
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|a Date Revised 16.08.2024
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2024 The Authors This is an Open Access article distributed under the terms of the Creative Commons Attribution Licence (CC BY-NC-ND 4.0), which permits copying and redistribution for non-commercial purposes with no derivatives, provided the original work is properly cited (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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|a The radiolytic degradation of 4-hydroxybenzoate (4-HBA-) in aerated, oxygen-free and N2O-saturated aqueous solutions at concentrations of 0.10 and 0.25 mmol/dm3 were gamma irradiated at different doses in a source of Co-60. The results show that ·OH adds predominantly to the 3 position of the aromatic ring, and elimination of the acid group leads to the degradation of 4-HBA-. With an N2O-saturated 0.10 mmol/dm3 4-HBA- solution, total degradation occurred at 1.6 kGy, and with a 0.25 mmol/dm3 solution, total degradation occurred at 3.5 kGy. In the aerated and oxygen-free 0.25 mmol/dm3 4-HBA- solutions, the behavior was similar, degradation occurring at a dose of 13.1 kGy. At the concentration of 0.10 mmol/dm3, total degradation occurred at 7.0 kGy, with small amounts of radiolytic products and byproducts. We propose a mechanism for the degradation of 4-HBA- caused by water radicals produced in the three environments, leading to formation of the identified stable products. Oxidation was followed by chemical oxygen demand (COD), which decreased as the 4-HBA- concentration increased. The kinetics showed a pseudo-first-order behavior. The rate constant of degradation was similar for the solutions with and without oxygen
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|a Journal Article
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|a 4-hydroxybenzoate
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|a advanced oxygen processes
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|a chemical oxygen demand
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|a kinetics
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|a radiation-induced degradation
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|a Parabens
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|a Oxygen
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|a S88TT14065
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|a 4-hydroxybenzoic acid
|2 NLM
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|a JG8Z55Y12H
|2 NLM
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|a Water Pollutants, Chemical
|2 NLM
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|a Water
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|a 059QF0KO0R
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|a Mendoza, Edith
|e verfasserin
|4 aut
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|i Enthalten in
|t Water science and technology : a journal of the International Association on Water Pollution Research
|d 1986
|g 89(2024), 12 vom: 31. Juni, Seite 3178-3191
|w (DE-627)NLM098149431
|x 0273-1223
|7 nnns
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| 773 |
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|g volume:89
|g year:2024
|g number:12
|g day:31
|g month:06
|g pages:3178-3191
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|u http://dx.doi.org/10.2166/wst.2024.167
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