John Wiley & Sons, Ltd.

Effect of low concentration 17β‐estradiol on the emissions of CH4 and CO2 in anaerobic sediments

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17β‐estradiol (E2) is one of the most widely distributed natural estrogens. It is the most potent estrogen in the environment. E2 and methanogenic bacteria communities were chosen as the study objects to analyze the impacts of E2 on the production of methane and carbon dioxide. Microecological systems in anaerobic pore water were constructed in laboratory. Our results show that E2 played an enhancing role in methanogenic activity when the concentrations were ≤0.5ng/L. The enhancement was the strongest at 0.3ng/L. However, when E2 concentration exceeded 1.0ng/L, it inhibited methanogenic activities of bacteria. The inhibition effect was up to 264h, beyond which the trend became unclear. On the other hand, E2 has an inhibition effect on the CO2 production in anaerobic sediments, which indicates that E2 had a significant inhibition effect on microbial activities under anaerobic condition. Based on our experiments, we believe that E2 in anaerobic sediments can affect sediment microbial activities, and therefore influence the self‐purification of water bodies as well as methane ebullition. Environ Toxicol Chem © 2013 SETAC

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