 |
| Titel |
Technical Note: Reactivity of C1 and C2 organohalogens formation – from plant litter to bacteria |
| VerfasserIn |
J. J. Wang, T. W. Ng, Q. Zhang, X. B. Yang, R. A. Dahlgren, A. T. Chow, P. K. Wong |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 9, no. 10 ; Nr. 9, no. 10 (2012-10-02), S.3721-3727 |
| Datensatznummer |
250007315
|
| Publikation (Nr.) |
 copernicus.org/bg-9-3721-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| C1/C2 organohalogens (organohalogens with one or two carbon atoms) can have
significant environmental toxicity and ecological impact, such as
carcinogenesis, ozone depletion and global warming. Natural halogenation
processes have been identified for a wide range of natural organic matter,
including soils, plant and animal debris, algae, and fungi. Yet, few have
considered these organohalogens generated from the ubiquitous bacteria, one
of the largest biomass pools on earth. Here, we report and confirm the
formation of chloroform (CHCl3) dichloro-acetonitrile (CHCl2CN),
chloral hydrate (CCl3CH(OH)2) and their brominated analogues by
direct halogenation of seven strains of common bacteria and nine cellular
monomers. Comparing different major C stocks during litter decomposition
stages in terrestrial ecosystems, from plant litter, decomposed litter, to
bacteria, we found increasing reactivity for nitrogenous organohalogen yield
with decreasing C/N ratio. Our results raise the possibility that natural
halogenation of bacteria represents a significant and overlooked
contribution to global organohalogen burdens. As bacteria are decomposers
that alter the C quality by transforming organic matter pools from high to
low C/N ratio and constitute a large organic N pool, the bacterial activity
is expected to affect the C, N, and halogen cycling through natural
halogenation reactions. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|