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Potential formation of mutagenicity by low pressure-UV/H2O2 during the treatment of nitrate-rich source waters

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Title: Potential formation of mutagenicity by low pressure-UV/H2O2 during the treatment of nitrate-rich source waters
Authors: Semitsoglou-Tsiapou, S
Templeton, MR
Graham, NJD
Mandal, S
Hernandez Leal, L
Kruithof, JC
Item Type: Journal Article
Abstract: Mutagenicity formation by low pressure (LP)-UV/H2O2 treatment of nitrate-rich water containing natural organic matter (NOM) was investigated. Laboratory-grade water samples spiked with either Pony Lake NOM or Suwannee River NOM (4 mg L−1 in both cases) and nitrate (50 mg L−1) were irradiated with UV fluences of 0, 1500 and 2000 mJ cm−2 and a H2O2 dose of 15 mg L−1 and tested for mutagenicity with the Ames II assay. LP-UV photolysis of nitrate in the presence of Pony Lake NOM caused a significant increase in the Ames II assay response and low concentrations of nitrite (0.08–0.09 mg NO2− L−1) and nitrophenols (0.014–0.046 μg L−1) were detected. Suwannee River NOM produced the same nitrite levels but no significant responses in the Ames II assay were observed. Additionally, samples collected from a drinking water treatment plant in the UK using LP-UV/H2O2 treatment were analysed with the Ames II assay. LC-OCD fractionation and SUVA measurements were performed to observe any changes in the properties of NOM. Significant differences in the mutagenicity response were observed between the treatment steps as well as between the two sampling periods. However, with respect to standard thresholds, none of the samples were found to be mutagenic towards the Salmonella typhimurium strain TA98 used.
Issue Date: 1-Sep-2018
Date of Acceptance: 14-Jan-2018
URI: http://hdl.handle.net/10044/1/56099
DOI: https://dx.doi.org/10.1039/C7EW00389G
ISSN: 2053-1400
Publisher: Royal Society of Chemistry
Start Page: 1252
End Page: 1261
Journal / Book Title: Environmental Science: Water Research and Technology
Volume: 4
Issue: 4
Copyright Statement: © The Royal Society of Chemistry 2018
Keywords: Science & Technology
Technology
Life Sciences & Biomedicine
Physical Sciences
Engineering, Environmental
Environmental Sciences
Water Resources
Engineering
Environmental Sciences & Ecology
NATURAL ORGANIC-MATTER
DISINFECTION BY-PRODUCTS
ADVANCED OXIDATION PROCESSES
DRINKING-WATER
NITRITE FORMATION
AQUEOUS-SOLUTION
SURFACE-WATER
AROMATIC-HYDROCARBONS
GENOTOXIC COMPOUNDS
HYDROGEN-PEROXIDE
Publication Status: Published
Online Publication Date: 2018-01-23
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering



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