title: Chemical and optical phototransformation of dissolved organic matter.
abstract: Dissolved organic matter represents the main reservoir of organic carbon in most aquatic ecosystems. In the present study, we determined the optical changes and the quantum yields of transient species formation for chromophoric dissolved organic matter (CDOM) samples undergoing photodegradation. The results show that the triplet states (3)CDOM* are potentially key players in CDOM photodegradation and that such transformations are strongly influenced by small differences in CDOM sources and sinks. In contrast, ·OH radicals are very unlikely to play a key role in phototransformation. These results represent an important first step in combining optical and transient species analyses to understand photodegradation processes of dissolved organic matter.
authors.affiliation: Dipartamento Farmaco Chimico Tecnologico, Università degli Studi di Siena, Siena, Italy. loiselle@unisi.it
authors.forename: Steven
authors.initials: S
authors.lastname: Loiselle
authors.forename: Davide
authors.initials: D
authors.lastname: Vione
authors.forename: Claudio
authors.initials: C
authors.lastname: Minero
authors.forename: Valter
authors.initials: V
authors.lastname: Maurino
authors.forename: Antonio
authors.initials: A
authors.lastname: Tognazzi
authors.forename: Arduino M
authors.initials: AM
authors.lastname: Dattilo
authors.forename: Claudio
authors.initials: C
authors.lastname: Rossi
authors.forename: Luca
authors.initials: L
authors.lastname: Bracchini
mesh_terms: D000042:Absorption / Q000528:radiation effects; D004307:Dose-Response Relationship, Radiation; D005663:Furans / Q000032:analysis; D007558:Italy; D060106:Lakes / Q000737:chemistry; D009930:Organic Chemicals / Q000737:chemistry*; D010636:Phenols / Q000032:analysis; D010782:Photolysis / Q000528:radiation effects*; D012995:Solubility / Q000528:radiation effects; D013057:Spectrum Analysis; D013997:Time Factors; D014466:Ultraviolet Rays
chemical_list: D005663:Furans; D009930:Organic Chemicals; D010636:Phenols; C012986:furfuryl alcohol