期刊
CHEMOSPHERE
卷 95, 期 -, 页码 464-469出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2013.09.098
关键词
Sensitised phototransformation; Chlorination; Reactive halogen species; Environmental photochemistry; Photoreactions in saltwater
资金
- PNRA - Progetto Antartide
- Universita di Torino - EU Accelerating Grants [TO_Call2_2012_0047]
The occurrence of Cl-2(-) in natural waters would depend on the budget between triplet-sensitised photogeneration (which might have second-order rate constant of 10(7)-10(9) M-1 s(-1)) and scavenging by dissolved organic matter (DOM, with possible rate constant of 10-10(3) L (mg C)(-1) s(-1)). The steady-state [Cl-2(-)] in brackish to saline waters might be in the range of 10(-14)-10(-12) M in mid-latitude summertime, coherently with data of phenol photochlorination in seawater. Steady-state [Cl-2(-)] would be enhanced by chloride (up to a plateau above 0.1 M Cl-) and inhibited by DOM. The radical Cl-2(-) would also be a major oxidant of nitrite to the nitrating agent.NO2 in brackish- and salt-water. This issue may explain the sustained formation of nitrophenols in phenol-spiked seawater and in natural brackish waters impacted by phenolic pollutants (Rhone delta, Southern France). (C) 2013 Elsevier Ltd. All rights reserved.
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