title: Investigation of the toxicity of common oxidants used in advanced oxidation processes and their quenching agents.
abstract: The inhibitory effect of commonly known oxidants and their quenching agents was investigated by employing a battery of toxicity tests. Hydrogen peroxide toxicity could be effectively eliminated by the enzyme catalase, whereas sodium thiosulfate and ascorbic acid were recommended as suitable quenching agents for the removal of the oxidants persulfate and peroxymonosulfate in the Vibrio fischeri bioassays. None of the studied quenching agents was found to be suitable for persulfate and peroxymonosulfate in the Daphnia magna bioassays since high inhibitory effects were obtained for both oxidants. In the case of Pseudokirchneriella subcapitata, manganese dioxide powder should be used as an alternative quenching agent to catalase, since this enzyme exhibited a highly toxic effect towards these microalgae. Sodium sulfite, which is extensively used as a quenching agent, was not appropriate for quenching peroxymonosulfate in all studied bioassays.
authors.affiliation: Istanbul Technical University, Faculty of Civil Engineering, Department of Environmental Engineering, 34469 Maslak, Istanbul, Turkey. Electronic address: tolmez@itu.edu.tr.
authors.forename: Tugba
authors.initials: T
authors.lastname: Olmez-Hanci
authors.affiliation: Istanbul Technical University, Faculty of Civil Engineering, Department of Environmental Engineering, 34469 Maslak, Istanbul, Turkey.
authors.forename: Idil
authors.initials: I
authors.lastname: Arslan-Alaton
authors.affiliation: Istanbul Technical University, Faculty of Civil Engineering, Department of Environmental Engineering, 34469 Maslak, Istanbul, Turkey.
authors.forename: Duygu
authors.initials: D
authors.lastname: Dursun
mesh_terms: D048908:Aliivibrio fischeri / Q000187:drug effects / Q000378:metabolism; D000818:Animals; D000975:Antioxidants / Q000737:chemistry* / Q000633:toxicity*; D001205:Ascorbic Acid / Q000737:chemistry / Q000633:toxicity; D001681:Biological Assay; D002374:Catalase / Q000737:chemistry / Q000633:toxicity; D000460:Chlorophyta / Q000187:drug effects / Q000254:growth & development; D003621:Daphnia / Q000187:drug effects; D006861:Hydrogen Peroxide / Q000737:chemistry / Q000633:toxicity; D049449:Luminescence; D017895:Manganese Compounds / Q000737:chemistry; D016877:Oxidants / Q000737:chemistry* / Q000633:toxicity*; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry / Q000633:toxicity; D010545:Peroxides / Q000737:chemistry / Q000633:toxicity; D017680:Potassium Compounds / Q000737:chemistry / Q000633:toxicity; D013431:Sulfates / Q000737:chemistry / Q000633:toxicity; D013447:Sulfites / Q000737:chemistry; D013885:Thiosulfates / Q000737:chemistry / Q000633:toxicity; D014865:Waste Disposal, Fluid / Q000379:methods; D018508:Water Purification / Q000379:methods
chemical_list: D000975:Antioxidants; D017895:Manganese Compounds; D016877:Oxidants; D010087:Oxides; D010545:Peroxides; D017680:Potassium Compounds; D013431:Sulfates; D013447:Sulfites; D013885:Thiosulfates; C038288:peroxymonosulfate; C009007:potassium persulfate; D006861:Hydrogen Peroxide; D002374:Catalase; C017717:sodium thiosulfate; D001205:Ascorbic Acid; C016552:manganese dioxide; C025026:sodium sulfite
keywords: Battery toxicity test; Hydrogen peroxide; Peroxymonosulfate; Persulfate; Quenching agents