Emission of iodine-containing volatiles by selected microalgae species
In this study we present the results of an emission study of different phytoplankton samples in aqueous media treated with elevated ozone levels. Halocarbon measurements show that the samples tested released bromoform and different iodocarbons, including iodomethane, iodochloromethane and diiodometh...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2014-12-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/14/13327/2014/acp-14-13327-2014.pdf |
| Summary: | In this study we present the results of an emission study of different
phytoplankton samples in aqueous media treated with elevated ozone levels.
Halocarbon measurements show that the samples tested released bromoform and
different iodocarbons, including iodomethane, iodochloromethane and
diiodomethane. Iodide and iodate levels in the liquid phase were
representative of concentrations of surface water in a natural environment.
Measurement of volatile iodine (I<sub>2</sub>) emissions from two diatom samples
(<i>Mediopyxis helysia</i> and <i>Porosira glacialis</i>) and the background sample
(F/2 medium from filtered natural
seawater) showed that the quantity of evolved I<sub>2</sub> depends on the ozone
concentration in the air. This behaviour was assumed to be caused by the
oxidation reaction mechanism of iodide with ozone. The I<sub>2</sub> emission flux
agrees with model calculations at different iodide concentrations. The
I<sub>2</sub> emission of a natural plankton concentrate sample was, however, very
low compared to other samples and showed no dependence on ozone. The reason
for this was shown to be the low iodide concentration in the algal
suspension, which seems to be the limiting factor in the oxidative formation
of I<sub>2</sub>. |
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| ISSN: | 1680-7316 1680-7324 |