Iodine diagenesis in pelagic deep-sea sediments

Kennedy, H.A.; Elderfield, Henry

doi:10.1016/0016-7037(87)90300-0

Cited by 130 publications

(63 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is widely speculated that this apparent disequilibrium is caused by the biological reduction of iodate to iodide, and marine microorganisms such as bacteria 24,28,84) and phytoplanktons 19,88,95) may play significant roles in the process. Iodide is also the dominant form of iodine in deep oxygenated water 64) , anoxic basins 20,29,30,50,85,94,96) , and porewater of marine sediment 31,44,60,66) . In deep water, iodide is often highly enriched at concentrations of several micromolars to more than 1 mM.…”

Section: Reduction Of Iodatementioning

confidence: 99%

“…In deep water, iodide is often highly enriched at concentrations of several micromolars to more than 1 mM. In addition to the abiotic chemical reduction of iodate and microbial remineralization of organic iodine compounds, the bacterial reduction of iodate is expected to be an important process to maintain the reduced form of iodine in these environments [28][29][30]44,50) . To date, only a few studies have been conducted on the bacterial reduction of iodate.…”

Section: Reduction Of Iodatementioning

confidence: 99%

See 1 more Smart Citation

Microbial Contribution to Global Iodine Cycling: Volatilization, Accumulation, Reduction, Oxidation, and Sorption of Iodine

2008

View full text Add to dashboard Cite

Iodine is an essential trace element for humans and animals because of its important role as a constituent of thyroid hormones. If the anthropogenic iodine-129 ( 129 I, half-life: 1.6×10 7 years), which is released from nuclear facilities into the environment and has a long half-life, participates in the biogeochemical cycling of iodine, it potentially accumulates in the human thyroid gland and might cause thyroid cancer. Therefore, it is necessary to obtain better information on the behavior of iodine in the environment for accurate safety assessments of 129 I. Major pathways of iodine cycling are the volatilization of organic iodine compounds into the atmosphere, accumulation of iodine in living organisms, oxidation and reduction of inorganic iodine species, and sorption of iodine by soils and sediments. Considerable geochemical evidence has indicated that these processes are influenced or controlled by microbial activities, although the precise mechanisms involved are still unclear. This review summarizes current knowledge on interactions between microorganisms and iodine, with special emphasis on newly isolated bacteria possibly contributing to the cycling of iodine on a global scale.

show abstract

Section: Reduction Of Iodatementioning

confidence: 99%

Section: Reduction Of Iodatementioning

confidence: 99%

Microbial Contribution to Global Iodine Cycling: Volatilization, Accumulation, Reduction, Oxidation, and Sorption of Iodine

2008

View full text Add to dashboard Cite

show abstract

“…Iodine exists principally in open seawater as the inorganic redox forms iodate (IO 3 -) and iodide (I -), with a total concentration of 400 to 500 nmol l -1 in most oceanic regions. While iodate predominates in the deep ocean (Tsunogai & Sase 1969, Elderfield & Truesdale 1980, Farrenkopf et al 1997), significant amounts of iodide are found in surface and near-bottom layers (Kennedy & Elderfield 1987, Wong 1991, Luther et al 1995. The interconversion of the redox couple iodate-iodide within the euphotic zone, together with the biophilic nature of iodine, has given rise to the idea that iodine speciation is linked to primary productivity (Sugawara & Terada 1967, Tsunogai & Henmi 1971, Elderfield & Truesdale 1980, Moisan et al 1994, Campos et al 1996, Truesdale et al 2000.…”

Section: Introductionmentioning

confidence: 99%

Transformation of iodate to iodide in marine phytoplankton driven by cell senescence

Bluhm¹,

Croot²,

Wuttig³

et al. 2010

Aquat. Biol.

View full text Add to dashboard Cite

“…It is widely speculated that this apparent disequilibrium is caused by biological reduction of iodate to iodide, and marine microorganisms such as bacteria (7,8,36) and phytoplankton (5,39,47) may play significant roles in the process. Iodide is also found as the dominant form of iodine in deep oxygenated waters (28), anoxic basins (6,9,10,22,37,46,48), and pore waters of marine sediments (11,20,26,29). In these deep waters, iodide is often highly enriched at concentrations of from several micromolars to more than 1 mM.…”

mentioning

confidence: 99%

Dissimilatory Iodate Reduction by Marine Pseudomonas sp. Strain SCT

Amachi

Kawaguchi

Muramatsu

et al. 2007

Appl Environ Microbiol

View full text Add to dashboard Cite

Bacterial iodate (IO 3؊ ) reduction is poorly understood largely due to the limited number of available isolates as well as the paucity of information about key enzymes involved in the reaction. In this study, an iodatereducing bacterium, designated strain SCT, was newly isolated from marine sediment slurry. SCT is phylogenetically closely related to the denitrifying bacterium Pseudomonas stutzeri and reduced 200 M iodate to iodide (I ؊ ) within 12 h in an anaerobic culture containing 10 mM nitrate. The strain did not reduce iodate under the aerobic conditions. An anaerobic washed cell suspension of SCT reduced iodate when the cells were pregrown anaerobically with 10 mM nitrate and 200 M iodate. However, cells pregrown without iodate did not reduce it. The cells in the former category showed methyl viologen-dependent iodate reductase activity (0.31 U mg ؊1 ), which was located predominantly in the periplasmic space. Furthermore, SCT was capable of anaerobic growth with 3 mM iodate as the sole electron acceptor, and the cells showed enhanced activity with respect to iodate reductase (2.46 U mg ؊1 ). These results suggest that SCT is a dissimilatory iodate-reducing bacterium and that its iodate reductase is induced by iodate under anaerobic growth conditions.

show abstract

Iodine diagenesis in pelagic deep-sea sediments

Cited by 130 publications

References 42 publications

Microbial Contribution to Global Iodine Cycling: Volatilization, Accumulation, Reduction, Oxidation, and Sorption of Iodine

Microbial Contribution to Global Iodine Cycling: Volatilization, Accumulation, Reduction, Oxidation, and Sorption of Iodine

Transformation of iodate to iodide in marine phytoplankton driven by cell senescence

Dissimilatory Iodate Reduction by Marine Pseudomonas sp. Strain SCT

Contact Info

Product

Resources

About