Iodine speciation in the water column of the Black Sea

Luther, George W.; Campbell, Todd M.

doi:10.1016/s0198-0149(10)80014-7

Cited by 77 publications

(43 citation statements)

References 14 publications

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“…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%

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

2008

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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.

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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

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“…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

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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.

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“…Iodine is principally emitted into the atmosphere in the organic form by oceanic primary production [8], although sea spray aerosol emissions are negligible due to the low concentration of I in seawater (400 to 500 nM [9]). In the ocean, I is mostly present in the IO 3 − form [10], even though significant quantities of I − have been detected, most likely as a product of biological cycling [11].…”

mentioning

confidence: 99%

Speciation analysis of iodine and bromine at picogram-per-gram levels in polar ice

Spolaor

Vallelonga²,

Gabrieli

et al. 2012

Anal Bioanal Chem

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Iodine and bromine species participate in key atmospheric reactions including the formation of cloud condensation nuclei and ozone depletion. We present a novel method coupling a high-performance liquid chromatography with ion chromatography and inductively coupled plasma mass spectrometry, which allows the determination of iodine (I) and bromine (Br) species (IO 3 − , I − , Br − , BrO 3 − ) at the picogram-per-gram levels presents in Antarctic ice. Chromatographic separation was achieved using an ION-PAC® AS16 Analytical Column with NaOH as eluent. Detection limits for I and Br species were 5 to 9 pg g −1 with an uncertainty of less than 2.5% for all considered species. Inorganic iodine and bromine species have been determined in Antarctic ice core samples, with concentrations close to the detection limits for iodine species, and approximately 150 pg g −1 for Br − . Although iodate (IO 3 − ) is the most abundant iodine species in the atmosphere, only the much rarer iodide (I − ) species was present in Antarctic Holocene ice. Bromine was found to be present in Antarctic ice as Br − .

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Iodine speciation in the water column of the Black Sea

Cited by 77 publications

References 14 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

Dissimilatory Iodate Reduction by Marine Pseudomonas sp. Strain SCT

Speciation analysis of iodine and bromine at picogram-per-gram levels in polar ice

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