title: Advanced oxidation of a commercially important nonionic surfactant: investigation of degradation products and toxicity.
abstract: The evolution of degradation products and changes in acute toxicity during advanced oxidation of the nonionic surfactant nonylphenol decaethoxylate (NP-10) with the H2O2/UV-C and photo-Fenton processes were investigated. H2O2/UV-C and photo-Fenton processes ensured complete removal of NP-10, which was accompanied by the generation of polyethylene glycols with 3-8 ethoxy units. Formation of aldehydes and low carbon carboxylic acids was evidenced. According to the acute toxicity tests carried out with Vibrio fischeri, degradation products being more inhibitory than the original NP-10 solution were formed after the H2O2/UV-C process, whereas the photo-Fenton process appeared to be toxicologically safer since acute toxicity did not increase relative to the original NP-10 solution after treatment. Temporal evolution of the acute toxicity was strongly correlated with the identified carboxylic acids being formed during the application of H2O2/UV-C and photo-Fenton processes.
authors.affiliation: Boğaziçi University, Institute of Environmental Sciences, 34342 Bebek, Istanbul, Turkey. Electronic address: akin.karci@boun.edu.tr.
authors.forename: Akin
authors.initials: A
authors.lastname: Karci
authors.forename: Idil
authors.initials: I
authors.lastname: Arslan-Alaton
authors.forename: Miray
authors.initials: M
authors.lastname: Bekbolet
mesh_terms: D000447:Aldehydes / Q000737:chemistry; D048908:Aliivibrio fischeri / Q000187:drug effects; D002244:Carbon / Q000032:analysis; D002264:Carboxylic Acids / Q000737:chemistry; D006861:Hydrogen Peroxide; D007501:Iron; D010100:Oxygen / Q000737:chemistry*; D055668:Photochemical Processes; D011092:Polyethylene Glycols / Q000032:analysis / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry*; D018675:Toxicity Tests; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification / Q000379:methods
chemical_list: D000447:Aldehydes; D002264:Carboxylic Acids; C045076:Fenton's reagent; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; C404762:polyoxyethylene(10)nonylphenyl ether; D011092:Polyethylene Glycols; D002244:Carbon; D006861:Hydrogen Peroxide; D007501:Iron; D010100:Oxygen
keywords: AOPs; Acute toxicity; Degradation product; EC(50); GC–MS; H(2)O(2)/UV-C process; HO; HPLC; NP-10; NPEOs; Nonylphenol decaethoxylate (NP-10); PEGs; Photo-Fenton process; SAS; SPE; TOC; WWTPs; advanced oxidation processes; effective concentration causing 50% inhibition; gas chromatography–mass spectrometry; high performance liquid chromatography; hydroxyl radicals; nonylphenol decaethoxylate; nonylphenol ethoxylates; polyethylene glycols; simulated acid mix sample; solid phase extraction; total organic carbon; wastewater treatment plants