Bacterial production of organic acids enhances H $_{2}$ O $_{2}$ -dependent iodide oxidation

Li, H.-P.*; Yeager, C. M.*; Brinkmeyer, R.*; Zhang, S.*; Ho, Y.-F.*; Xu, C.*; Jones, W. L.*; Schwehr, K. A.*; Otosaka, Shigeyoshi ; Roberts, K. A.*; Kaplan, D. I.*; Santschi, P. H.*

In order to develop an understanding of the role that microorganisms play in the transport of $^{129}$ I in soil-water systems, naturally occurring bacteria isolated from the F-area subsurface of the Savannah River Site (SRS) were assessed for iodide oxidizing activity. Spent liquid medium from a number of SRS bacterial cultures enhanced iodide oxidation 2-10 fold in the presence of hydrogen peroxide (H $_{2}$ O $_{2}$ ). From a time-series measurements of peroxidase activities and organic acid concentrations, it was hypothesized that microbial organic acid exudate promoted iodide oxidation via following mechanisms; (1) organic acids interact with H $_{2}$ O $_{2}$ to form strong iodide oxidizing agents, peroxy carboxylic acids, and (2) organic acid secretion led to enhanced rates of H $_{2}$ O $_{2}$ -dependent iodide oxidation by lowering the pH of the culture medium.

Language	:	English
Journal	:	Environmental Science & Technology
Volume	:	46
Number	:	9
Pages	:	p.4837 - 4844
Publication Year/Month	:	2012/03
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Paper URL	:	https://doi.org/10.1021/es203683v
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Registration No. : AA20111069
JAEA Abstracts No. : 40000674
Paper Submission No. : 10614

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Bacterial production of organic acids enhances HO-dependent iodide oxidation

Bacterial production of organic acids enhances H $_{2}$ O $_{2}$ -dependent iodide oxidation