The contribution of microbial biomass to the adsorption of radioiodide in soils

Bors, J.; Martens, Rainer

doi:10.1016/0265-931x(92)90041-q

Cited by 35 publications

(23 citation statements)

References 12 publications

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“…Koch et al 46) observed increased iodide sorption in soils treated with glucose, and decreased sorption in soils treated with thymol (an antiseptic). Decreased iodine sorption by fumigated, air-dried, or gamma-irradiated soil has also been reported 13) . Similarly, several studies on marine sediment (oxic sediment) showed the presence of very high concentrations of iodine 51,67,68) .…”

Section: Sorption Of Iodine By Soils and Sedimentsmentioning

confidence: 80%

“…These values are much greater than those for rocks and plants (0.05 to 0.5 mg kg −1 ) 89) , indicating that iodine is highly accumulated in soils. Although the sorption by soils is affected by various physico-chemical parameters including soil type, pH, Eh, salinity, and organic matter content 32,89) , a number of studies have indicated that soil microorganisms are also involved in the process 11,13,46,62) . Muramatsu and Yoshida 62) found that autoclaving of soils significantly reduced the sorption of iodide.…”

Section: Sorption Of Iodine By Soils and Sedimentsmentioning

confidence: 99%

“…Thus, it is presumed that iodide oxidation, at least in part, plays a role in the sorption of iodine. This hypothesis is supported by the fact that iodine sorption in soils occurs more easily under oxic conditions than anoxic conditions [11][12][13]62,77) .…”

Section: Sorption Of Iodine By Soils and Sedimentsmentioning

confidence: 99%

See 2 more Smart Citations

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: Sorption Of Iodine By Soils and Sedimentsmentioning

confidence: 80%

Section: Sorption Of Iodine By Soils and Sedimentsmentioning

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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“…However, the sorption to carboniferous particles was very high and irreversible, in particular, sorption to the organic compounds and the micro-organisms contained therein. Some authors, e.g., [315,322,323] pointed to a possible involvement of microbiology for the fixation of radioiodine to surface soils. In older publications [324,325] a reaction of iodine with tyrosine, thiol groups and polyphenyls was proposed.…”

Section: (See Above)mentioning

confidence: 99%

Speciation of Radionuclides in the Environment

Gunten

Beneš

1995

Radiochimica Acta

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Methods for the determination of the speciation of radionuclides in aerosols, in aquatic solutions, in sediments, soils and rocks are reviewed. At present, most of the results about speciation are deduced from model calculations, model experiments, and separation of species (forms) of radionuclides, e.g., by sequential extraction procedures. Methods of direct determination of speciation of radionuclides (e.g., by laser induced spectroscopy) are in general not yet sensitive enough for a measurement of the very low concentrations of radionuclides in the environment. The methodological part of this paper is followed by a review of the very abundant literature about speciation of important radionuclides in the environment, i.e., in the atmosphere, hydrosphere and lithosphère. The review does not include the biosphere. Literature up to spring 1993 is included (with a few more recent additions).

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“…These values are much higher than those in their parental materials, such as rocks and plants (0.05 to 0.5 mg kg Ϫ1 ) (37), indicating that iodine is highly accumulated in soils. Although iodine sorption to soils is affected by various physicochemical parameters, including soil type, pH, E h , salinity, and organic carbon content (16,37), a number of studies have indicated that soil microorganisms are also involved in the process (5,8,20,26). Muramatsu and Yoshida (26) found that autoclaving of soils significantly reduced the sorption of iodide.…”

mentioning

confidence: 99%

Active Transport and Accumulation of Iodide by Newly Isolated Marine Bacteria

Amachi

Mishima

Shinoyama

et al. 2005

Appl Environ Microbiol

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Iodide (I؊ )-accumulating bacteria were isolated from marine sediment by an autoradiographic method with radioactive 125 I ؊ . When they were grown in a liquid medium containing 0.1 M iodide, 79 to 89% of the iodide was removed from the medium, and a corresponding amount of iodide was detected in the cells. Phylogenetic analysis based on 16S rRNA gene sequences indicated that iodide-accumulating bacteria were closely related to Flexibacter aggregans NBRC15975 and Arenibacter troitsensis, members of the family Flavobacteriaceae. When one of the strains, strain C-21, was cultured with 0.1 M iodide, the maximum iodide content and the maximum concentration factor for iodide were 220 ؎ 3.6 (mean ؎ standard deviation) pmol of iodide per mg of dry cells and 5.5 ؋ 10 3 , respectively. In the presence of much higher concentrations of iodide (1 M to 1 mM), increased iodide content but decreased concentration factor for iodide were observed. An iodide transport assay was carried out to monitor the uptake and accumulation of iodide in washed cell suspensions of iodide-accumulating bacteria. The uptake of iodide was observed only in the presence of glucose and showed substrate saturation kinetics, with an apparent affinity constant for transport and a maximum velocity of 0.073 M and 0.55 pmol min ؊1 mg of dry cells ؊1 , respectively. The other dominant species of iodine in terrestrial and marine environments, iodate (IO 3 ؊ ), was not transported.

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The contribution of microbial biomass to the adsorption of radioiodide in soils

Cited by 35 publications

References 12 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

Speciation of Radionuclides in the Environment

Active Transport and Accumulation of Iodide by Newly Isolated Marine Bacteria

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