Methyl t-butyl ether mineralization in surface-water sediment microcosms under denitrifying conditions

Article Abstract:

Microorganisms in surface water sediment can degrade methyl t-butyl ether (MTBE) to CO(sub 2) under denitrifying conditions. MTBE is a fuel additive that the EPA has classified as a possible carcinogen.

MTBE, Hydrocarbons, Methyl tertiary butyl ether

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Anaerobic oxiation of (1,2-14C)dichloroethene uner Mn(IV)-reducing conditions

Article Abstract:

A microcosm study was conducted to examine the anaerobic oxidation of (1,2-14C)dichloroethene (DCE) to 14CO2 under Mn(IV)-reducing conditions. Aquifer and surface sediments collected from a site at the Naval Undersea Warfare Center in Washington were characterize by fine to medium sands with some gravel and Mn(IV) oxide content. Results suggest that under anaerobic conditions, both Mn(IV) reduction and DCE mineralization was coupled to Mn(IV) reduction.

Usage, Manganese, Manganese (Metal), Oxidation-reduction reaction, Oxidation-reduction reactions, Microbial contamination

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Humic acids as electron acceptors for anaerobic microbial oxidation of vinyl chloride and dichloroethene

Article Abstract:

The anaerobic oxidation of (1,2-14C)vinyl chloride (VC) and (1,2-14C)dichloroethene (DCE) to (super 14)CO(sub 2) was carried out. It has been observed that humic acid compounds can act as electron acceptors for the anaerobic oxidation of these organic contaminants. This finding suggest that the efficient mineralization of VC and DCE can be done by humic acids without accumulating reduced intermediates even under methanogenic conditions.

Environmental aspects, Humic acid, Humic acids, Vinyl chloride, Dichloroethylene, Vinylidene chloride

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