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).

Formation and reactivity of the dichloride radical (Cl2–•) in surfacewaters: A modelling approach

MINELLA, Marco;MAURINO, Valter;MINERO, Claudio;VIONE, Davide Vittorio
2014

Abstract

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).
95
464
469
Sensitised phototransformation; Chlorination; Reactive halogen species; Environmental photochemistry; Photoreactions in saltwater
M. Brigante; M. Minella; G. Mailhot; V. Maurino; C. Minero; D. Vione
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/153225
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