Marine bacterial degradation of brominated methanes

被引:37
作者
Goodwin, KD [1 ]
Lidstrom, ME [1 ]
Oremland, RS [1 ]
机构
[1] CALTECH, PASADENA, CA 91125 USA
关键词
D O I
10.1021/es970165g
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Brominated methanes are ozone-depleting compounds whose natural sources include marine algae such as kelp. Brominated methane degradation by bacteria was investigated to address whether bacterial processes might effectnet emission of these compounds to the atmosphere. Bacteria in seawater collected from California kelp beds degraded CH2Br2 but not CHBr3. Specific inhibitors showed that methanotrophs and nitrifiers did not significantly contribute to CH2Br2 removal. A seawater enrichment culture oxidized (CH2Br2)-C-14 to (CO2)-C-14 as well as (CH3Br)-C-14 to (CO2)-C-14. The rates of CH2Br2 degradation in laboratory experiments suggest that bacterial degradation of CH2Br2 in a kelp bed accounts for <1% of the CH2Br2 produced by the kelp. However,the half-life of CH2Br2 due to bacterial removal appears faster than hydrolysis and within an order of magnitude of volatilization to the atmosphere.
引用
收藏
页码:3188 / 3192
页数:5
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