Factors influencing the photodegradation of N-nitrosodimethylamine in drinking water

Xu, Bin; Chen, Zhonglin; Qi, Fei; Shen, Jimin; Wu, Fengchang

doi:10.1007/s11783-009-0013-8

Cited by 27 publications

(18 citation statements)

References 36 publications

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“…During the photolysis of RNTD and NZTD, the NO 2 À concentration was always higher than NO 3 À concentration. Xu et al (2009) observed similar results at neutral pH also, i.e., the concentration of NO 3 À produced was much lower than that of NO 2 À during the photolysis of nitroso-containing compounds. The formation of NO 3 À may be derived from the oxidation of NO 2 À .…”

Section: Effect Of Uv Photolysis On Hnmsfpsupporting

confidence: 70%

Degradation of nitro-based pharmaceuticals by UV photolysis: Kinetics and simultaneous reduction on halonitromethanes formation potential

et al. 2017

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a b s t r a c tThis study investigated the degradation kinetics and halonitromethanes formation potential (HNMsFP) of two nitro-based pharmaceuticals (i.e., ranitidine (RNTD) and nizatidine (NZTD)) during ultraviolet (UV) photolysis. It was found that the degradation kinetics of RNTD and NZTD exhibited pH-dependent trends, in accordance with their deprotonation equilibria. The neutral species of RNTD and NZTD were more photo-reactive than their corresponding deprotonated species, with their specific fluence-based firstorder rate constants varying in the range of 5.64e31.90 m 2 E À1. Both the RNTD and NZTD were prone precursors of HNMs (with molar yields of 5.6± 0.3% and 4.7± 0.4%, respectively at pH 7.0). Acidic and neutral circumstances facilitated the HNMs formation. The UV photolysis of RNTD and NZTD could reduce their HNMsFP simultaneously. Positive linear relationships between residual RNTD or NZTD concentration and HNMsFP were observed and the denitration during the UV photolysis accounted for the HNMsFP reduction. With the mandatory UV disinfection fluences in China (i.e. 20e80 mJ cm À2 ), the effective abatement of RNTD and NZTD and their HNMsFP could not be fully achieved, highlighting the necessity of increasing UV fluence or developing UV-based advanced oxidation process in future.

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Section: Effect Of Uv Photolysis On Hnmsfpsupporting

confidence: 70%

Degradation of nitro-based pharmaceuticals by UV photolysis: Kinetics and simultaneous reduction on halonitromethanes formation potential

et al. 2017

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“…However, the absorption is also pH-dependent [118,119]. Therefore, one might expect photolytic destruction to also depend on the solution's pH.…”

Section: Photolytic Reactions and Advanced Oxidation Processesmentioning

confidence: 99%

“…Therefore, one might expect photolytic destruction to also depend on the solution's pH. Indeed, Xu et al [118,120] have shown that an acidic pH favors the destruction of nitrosamine, while an alkali pH may substantially retard the process. The earlier work of Stefan and Bolton [121] indicated also that the photolytic destruction of NDMA is favored by acidic conditions.…”

Section: Photolytic Reactions and Advanced Oxidation Processesmentioning

confidence: 99%

Nitrosamines and water

Nawrocki

Andrzejewski

2011

Journal of Hazardous Materials

184

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“…Nitrate and nitrite have been reported in literature to be formed under NDMA photodegradation in weakly acidic water solution (Plumlee and Reinhard, 2007). However literature findings also suggest that in alkaline solutions, other inorganic nitrogen products than nitrate and nitrite like N 2 and N 2 O are formed (Xu et al, 2009a;Stefan and Bolton, 2002).…”

Section: Uv-light Tests With 50 Wt% Deamentioning

confidence: 98%

Formation and Destruction of NDELA in 30 wt% MEA (Monoethanolamine) and 50 wt% DEA (Diethanolamine) Solutions

Knuutila

Asif

Vevelstad

et al. 2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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La destruction par irradiation UV de la NDELA pre´sente dans le solvant a aussi e´te´e´tudie´e sur la meˆme installation pilote. Deux campagnes de mesure ont e´te´mene´es, la premie`re utilisant une solution de 30 %m de monoe´thanolamine (MEA) et la seconde utilisant une solution de 50 %m de die´thanolamine (DEA). Durant la campagne de mesure sur la DEA, la destruction de la NDELA dans les eaux de nettoyage a aussi e´te´teste´e. De plus, la de´gradation thermique d'e´chantillons de solution de´grade´e pre´leve´s dans l'installation pilote a e´te´teste´e. Les re´sultats indiquent que de la NDELA se forme en pre´sence d'oxyde d'azote et de dioxyde d'azote. Il a e´te´constate´que la destruction de la NDELA par la lumie`re UV dans la boucle de solvant e´tait lente. La destruction de la NDELA par la lumie`re UV dans le compartiment des eaux de nettoyage a e´te´de´montre´e. La de´gradation de la NDELA durant des e´tudes de de´gradation thermique a`135°C a e´te´e´tablie.Abstract -Formation and Destruction of NDELA in 30 wt% MEA (Monoethanolamine) and 50 wt% DEA (Diethanolamine) Solutions -The formation of nitrosodiethanolamine (NDELA) in a lab scale pilot was studied by feeding known amounts of nitrogen oxide and nitrogen dioxide into the gas entering the absorber. In the same pilot, the destruction by UV-irradiation of NDELA present in the solvent was studied. Two campaigns were performed, one with 30 wt% monoethanolamine (MEA) and one with 50 wt% diethanolamine (DEA). During the DEA campaign the destruction of NDELA in the water wash section was also tested. Additionally, degraded solution samples withdrawn from the pilot were tested for thermal degradation. The results show that NDELA was formed when nitrogen oxide and nitrogen dioxide were present. Destruction of NDELA with UV-light in the solvent loop was found to be slow. In the water wash section, the UV-light destroyed the NDELA effectively. NDELA was found to degrade during the thermal degradation studies at 135°C.

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Factors influencing the photodegradation of N-nitrosodimethylamine in drinking water

Cited by 27 publications

References 36 publications

Degradation of nitro-based pharmaceuticals by UV photolysis: Kinetics and simultaneous reduction on halonitromethanes formation potential

Degradation of nitro-based pharmaceuticals by UV photolysis: Kinetics and simultaneous reduction on halonitromethanes formation potential

Nitrosamines and water

Formation and Destruction of NDELA in 30 wt% MEA (Monoethanolamine) and 50 wt% DEA (Diethanolamine) Solutions

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