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Effect of Methyl tert-Butyl Ether and Its Metabolites on Microbial Activity and Diversity in Tidal Mud Flat  

Cho, Won-Sil (Department of Environmental Science & Engineering, Ewha Womans University)
Cho, Kyung-Suk (Department of Environmental Science & Engineering, Ewha Womans University)
Publication Information
Microbiology and Biotechnology Letters / v.36, no.4, 2008 , pp. 336-342 More about this Journal
Abstract
The effect of methyl tert-butyl ether (MTBE) and its metabolites like tert-butyl alcohol (TBA), and formaldehyde (FA) on microbial activity and diversity in tidal mud flat was studied. MTBE, TBA, and FA with different concentrations were added into microcosms containing tidal mud samples, and placed at room temperature for 30 days. Then the physico-chemical properties such as pH, moisture contents and organic matter contents in the microcosms were measured. In addition, the total viable cell number and dehydrogenase activity were measured. Bacterial communities in the microcosms were monitored using a 16S rRNA-PCR-DGGE (Denaturing gradient gel electrophoresis) fingerprinting method. As a result, the exposure concentrations of MTBE and its metabolites showed no correlation with the physico-chemical factors (P>0.05). Dehydrogenase activity and total viable cell number were decreased with increasing MTBE, TBA and FA concentrations (P<0.05). The toxic effect was higher the following order: FA > MTBE > TBA. Dominant species in the microcosms contaminated with MTBE and its metabolites were Sphingobacteria, Flavobacteria, delta-proteobacteria, gamma-proteobacteria. The diversity of bacterial community was not significantly influenced by MTBE and its metabolites.
Keywords
Methyl tert-butyl ether(MTBE); tert-butyl alcohol(TBA); formaldehyde(FA); tidal mud flat; microbial activity; microbial diversity;
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