Coastal iodine emissions. 1. Release of I2 by Laminaria digitata in chamber experiments.
Environ Sci Technol
; 46(19): 10413-21, 2012 Oct 02.
Article
en En
| MEDLINE
| ID: mdl-22934673
ABSTRACT
Tidally exposed macroalgae emit large amounts of I(2) and iodocarbons that produce hotspots of iodine chemistry and intense particle nucleation events in the coastal marine boundary layer. Current emission rates are poorly characterized, however, with reported emission rates varying by 3 orders of magnitude. In this study, I(2) emissions from 25 Laminaria digitata samples were investigated in a simulation chamber using incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS). The chamber design allowed gradual extraction of seawater to simulate tidal emersion of algae. Samples were exposed to air with or without O(3) and to varying irradiances. Emission of I(2) occurred in four distinct stages (1) moderate emissions from partially submerged samples; (2) a strong release by fully emerged samples; (3) slowing or stopping of I(2) release; and (4) later pulses of I(2) evident in some samples. Emission rates were highly variable and ranged from 7 to 616 pmol min(-1) gFW(-1) in ozone-free air, with a median value of 55 pmol min(-1) gFW(-1) for 20 samples.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Algas Marinas
/
Yodo
/
Laminaria
/
Biología Marina
Idioma:
En
Revista:
Environ Sci Technol
Año:
2012
Tipo del documento:
Article
País de afiliación:
Irlanda