title: Determination of hydroxyl radicals with salicylic acid in aqueous nitrate and nitrite solutions.
abstract: The qualitative and quantitative analyses of reactive oxygen species are essential to determine their steady-state concentration and related reaction mechanisms in environmental aquatic systems. In this study, salicylic acid was employed as an innovative molecular probe of hydroxyl radical(OH) generated in aqueous nitrate and nitrite solutions through photochemical reactions. Kinetic studies showed that the steady-state concentrations of OH in aqueous NO3- (10 mmol/L, pH = 5) and NO2- (10 mmol/L, pH = 5) solutions under ultraviolet irradiation were at a same magnitude, 10(-15) mol/L. Apparent quantum yields of OH at 313 nm were measured as 0.011 and 0.07 for NO3- and NO2- respectively, all comparable to the results of previous studies.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China. yangxi@nju.edu.cn
authors.forename: Xi
authors.initials: X
authors.lastname: Yang
authors.forename: Man-jun
authors.initials: MJ
authors.lastname: Zhan
authors.forename: Ling-ren
authors.initials: LR
authors.lastname: Kong
authors.forename: Lian-sheng
authors.initials: LS
authors.lastname: Wang
mesh_terms: D000890:Anti-Infective Agents / Q000737:chemistry*; D017665:Hydroxyl Radical / Q000032:analysis*; D007700:Kinetics; D016877:Oxidants / Q000032:analysis*; D017382:Reactive Oxygen Species; D020156:Salicylic Acid / Q000737:chemistry*; D014466:Ultraviolet Rays; D014873:Water Pollutants / Q000032:analysis
chemical_list: D000890:Anti-Infective Agents; D016877:Oxidants; D017382:Reactive Oxygen Species; D014873:Water Pollutants; D017665:Hydroxyl Radical; D020156:Salicylic Acid