Photostability and photolability of dissolved organic matter upon irradiation of natural water samples under simulated sunlight.

Autor:	Davide Vione, Vittorio Lauri, Claudio Minero, Valter Maurino, Mery Malandrino, Maria Carlotti, Romeo-Iulian Olariu, Cecilia Arsene
Předmět:	DISSOLVED organic matter ORGANIC photochemistry WATER analysis WATER chemistry LAKES GROUNDWATER IRRADIATION CARBON compounds
Zdroj:	Aquatic Sciences; Mar2009, Vol. 71 Issue 1, p34-45, 12p
Abstrakt:	Abstract.  In this study the photostability/photolability of Dissolved Organic Matter (DOM) was assessed in both lake and groundwater. DOM in groundwater can undergo significant irradiation when drawn to the surface for agricultural purposes. DOM was generally photostable in lake and photolabile in groundwater, with a more elevated rate constant of DOM disappearance in groundwater samples with higher Non-Purgeable Organic Carbon (NPOC). DOM in lake water became photolabile upon acidification. The parallel decrease of both Total Organic Carbon (TOC) and NPOC suggests that actual photomineralisation took place in the samples. The •OH radicals play a secondary role into DOM photomineralisation in lake water, despite the fact that their generation rate considerably increases at acidic pH. The role of •OH is also minor in the photomineralisation of DOM contained in nitrate-rich groundwater. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
Externí odkaz:	Zobrazit plný text záznamu Full text from SpringerLink