GIBBS FREE-ENERGY OF FORMATION OF HALOGENATED AROMATIC-COMPOUNDS AND THEIR POTENTIAL ROLE AS ELECTRON-ACCEPTORS IN ANAEROBIC ENVIRONMENTS
GIBBS FREE-ENERGY OF FORMATION OF HALOGENATED AROMATIC-COMPOUNDS AND THEIR POTENTIAL ROLE AS ELECTRON-ACCEPTORS IN ANAEROBIC ENVIRONMENTS
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DOI：
10.1021/es00035a021
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发表时间：
1992-11-01
影响因子：
11.4
通讯作者：
HARRISON, BK
中科院分区：
文献类型：
--
作者：
DOLFING, J;HARRISON, BK
本文用Benson方法估算了各类卤代芳香族化合物的生成吉布斯自由能。这些数据被用来评估这些化合物作为电子受体在厌氧环境中的潜力。结果表明，对于（氯）苯、苯甲酸盐和苯酚，Ar-X/Ar-H电对的氧化还原电位在266-478 mV之间。这意味着微生物可以通过将电子以H2的形式从厌氧环境路由到作为电子受体的卤代芳族化合物来潜在地保存用于生长的能量。这一理论预测已被证实为3-氯苯甲酸。从厌氧沉积物和污水污泥中获得的富集培养物的存在表明，存在更多的微生物可以从使用卤代芳香族化合物作为电子受体中受益。
The Gibbs free energies of formation of various classes of halogenated aromatic compounds were estimated with Benson's method. The data were used to evaluate the potential of these compounds to serve as electron acceptors in anaerobic environments. The results indicate that for (chloro) benzenes, benzoates, and phenols, the redox potentials of the couples Ar-X/Ar-H are in the range of 266-478 mV. This implies that microorganisms can potentially conserve energy for growth by routing electrons in the form of H2 from anaerobic environments to halogenated aromatic compounds as electron acceptors. This theoretical prediction has been corroborated for 3-chlorobenzoate. The existence of enrichment cultures, obtained from anaerobic sediments and sewage sludges, that dechlorinate other halogenated aromatic compounds suggests the existence of more microorganisms that can benefit from the use of halogenated aromatic compounds as electron acceptors.