首页> 外文会议>International Conference on Groundwater Research, Jun 6-8, 2000, Copenhagen, Denmark >H_2 - thermodynamic, kinetic and physical controls on the observed levels and the relation to specific redox processes
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H_2 - thermodynamic, kinetic and physical controls on the observed levels and the relation to specific redox processes

机译:H_2-观测水平的热力学,动力学和物理控制以及与特定氧化还原过程的关系

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Hydrogen is an important intermediate produced through fermentation of organic matter and used in terminal electron acceptor processes. In systems dominated by sulfate reduction and methanogenesis the level of H_2 is related to the Gibbs energy of the reactions so that the energy yield is constant for the given reaction. The calculated energy yield is close to the minimum energy required for energy storage by ATP synthesis. Also for non-dissolved electron acceptors, such as Fe-oxides, data indicate that the observed H_2 level is related to the Gibbs energy, though the nature of Fe-oxides makes this difficult to confirm. Concentrations of H_2 are also influenced by physical sediment properties, and advective flow.
机译:氢是通过有机物发酵产生的重要中间体,并用于末端电子受体过程。在以硫酸盐还原和甲烷生成为主导的系统中,H_2的水平与反应的吉布斯能量有关,因此对于给定的反应,能量产率是恒定的。计算出的能量产量接近通过ATP合成存储能量所需的最小能量。同样对于非溶解的电子受体,例如Fe-氧化物,数据表明观察到的H_2水平与吉布斯能量有关,尽管Fe-氧化物的性质使得这一点难以确定。 H_2的浓度还受到物理沉积物性质和对流的影响。

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