title: Dark production of hydroxyl radicals by aeration of anoxic lake water.
abstract: Lake circulation is an important phenomenon that ensures oxygenation of the water column. Here we report that aeration of anoxic hypolimnion water causes production of highly reactive hydroxyl radicals (·OH), which are also produced photochemically in the epilimnion. Model calculations suggest that the dark process of ·OH generation can be comparable with photochemical reactions in some lake environments, provided that the hypolimnion is a significant fraction of the whole lake volume. In these cases, lake overturn could significantly contribute to the yearly ·OH budget of the lake water and might cause significant degradation of some pollutants, for which the reaction with ·OH is an important removal process from surface waters.
authors.affiliation: Università di Torino, Dipartimento di Chimica, Via Pietro Giuria 5, 10125 Torino, Italy.
authors.forename: Marco
authors.initials: M
authors.lastname: Minella
authors.affiliation: Università di Torino, Dipartimento di Chimica, Via Pietro Giuria 5, 10125 Torino, Italy.
authors.forename: Elisa
authors.initials: E
authors.lastname: De Laurentiis
authors.affiliation: Università di Torino, Dipartimento di Chimica, Via Pietro Giuria 5, 10125 Torino, Italy.
authors.forename: Valter
authors.initials: V
authors.lastname: Maurino
authors.affiliation: Università di Torino, Dipartimento di Chimica, Via Pietro Giuria 5, 10125 Torino, Italy.
authors.forename: Claudio
authors.initials: C
authors.lastname: Minero
authors.affiliation: Università di Torino, Dipartimento di Chimica, Via Pietro Giuria 5, 10125 Torino, Italy; Università di Torino, Centro Interdipartimentale NatRisk, Via Leonardo da Vinci 44, 10095 Grugliasco, TO, Italy. Electronic address: davide.vione@unito.it.
authors.forename: Davide
authors.initials: D
authors.lastname: Vione
keywords: Anoxic lake water; Hydroxyl radicals; Lake circulation; Reactive oxygen species