Quinone moieties act as electron acceptors in the reduction of humic substances by humics-reducing microorganisms

Article Abstract:

Humic substances were used to examine the electron-mediating ability of quinones moieties during the transfer of electrons from microorganisms. The humics-reducing microorganism "Geobacter metallireducens" was considered in recognition of its ability to transfer electrons in different environments. Results showed the importance of electron-accepting ability and radical content. It as also shown that the transfer of electrons to humic substances by humics-reducing microorganisms directly influence the number of organic radicals.

Basic Chemical Manufacturing, Industrial Organic Chemicals, Organic Chemicals, Organic compounds, Electron transport, Quinone, Quinones, Humic acid, Humic acids

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Estimation of Gibbs free energies of formation for polychlorinated biphenyls

Article Abstract:

The utilization of Gibbs free energies of formation for estimating polychlorinated biphenyl (PCB) congeners is discussed. Experimental and predicted data for PCBs were located by a literature search. An estimation program based on the group additivity method was used to estimate the standard-state enthalpies and entropies of gas formation when data was unavailable. The amount of dechlorination reaction energy is estimated by comparing the Gibbs free energy of formation of substrates and products in aqueous solutions.

Measurement, Polychlorinated biphenyls, Gibbs' free energy

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