Current understanding of organically bound tritium (OBT) in the environment

Kim, S.B.; Baglan, N.; Davis, Philip A.

doi:10.1016/j.jenvrad.2013.07.011

Cited by 107 publications

(41 citation statements)

References 53 publications

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“…Bound to N, O and S, hydrogen is usually exchangeable with ambient water and water vapor Hobson, 2000, 2003). However, hydrogen bound to carbon is considered to be stable and non-exchangeable due to the strong covalent bonds (Baumgärtner and Donhaerl, 2004;Diabaté and Strack, 1997;Kim et al, 2013). On the ecosystem scale, H bound to C is not exchangeable (Sessions et al, 2004).…”

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confidence: 99%

Hydrogen dynamics in soil organic matter as determined by 13C and 2H labeling experiments

et al. 2016

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Abstract. Understanding hydrogen dynamics in soil organic matter is important to predict the fate of 3 H in terrestrial environments. One way to determine hydrogen fate and to point out processes is to examine the isotopic signature of the element in soil. However, the non-exchangeable hydrogen isotopic signal in soil is complex and depends on the fate of organic compounds and microbial biosyntheses that incorporate water-derived hydrogen. To decipher this complex system and to understand the close link between hydrogen and carbon cycles, we followed labeled hydrogen and labeled carbon throughout near-natural soil incubations. We performed incubation experiments with three labeling conditions: 1 -13 C 2 H double-labeled molecules in the presence of 1 H 2 O; 2 -13 C-labeled molecules in the presence of 2 H 2 O; 3 -no molecule addition in the presence of 2 H 2 O. The preservation of substrate-derived hydrogen after 1 year of incubation (ca. 5 % in most cases) was lower than the preservation of substrate-derived carbon (30 % in average). We highlighted that 70 % of the C-H bonds are broken during the degradation of the molecule, which permits the exchange with water hydrogen. Added molecules are used more for trophic resources. The isotopic composition of the non-exchangeable hydrogen was mainly driven by the incorporation of water hydrogen during microbial biosynthesis. It is linearly correlated with the amount of carbon that is degraded in the soil. The quantitative incorporation of water hydrogen in bulk material and lipids demonstrates that nonexchangeable hydrogen exists in both organic and mineralbound forms. The proportion of the latter depends on soil type and minerals. This experiment quantified the processes affecting the isotopic composition of non-exchangeable hydrogen, and the results can be used to predict the fate of tritium in the ecosystem or the water deuterium signature in organic matter.

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confidence: 99%

Hydrogen dynamics in soil organic matter as determined by 13C and 2H labeling experiments

et al. 2016

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“…it is practically unable to exchange in the presence of biosynthesis or,vice versa, decay. However, tritium atoms fixed with oxygen, sulphur, nitrogen or phosphorus atoms are ready to exchange with water hydrogen and are not considered as OBT or classified as exchangeable OBT [1]. OBT has a long lifetime, i.e.…”

Section: Organic Substances With Tritiummentioning

confidence: 99%

Radiological Problems of Tritium

Synzynys¹,

Момот²,

Mirzeabasov³

et al. 2018

KEG

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In light of the session documents (UNSCEAR, 2015(UNSCEAR, , 2016, presented are the results of health risk assessment in drinking water containing tritium as well as results of field observations and bioassay with algae (Lemna minor and Polyrhiza) from water bodies near radiation-dangerous industrial and scientific objects. The prospects for future studies in these areas should be associated with the assessed human radiation dose from organically bound tritium in organs and tissues of people, animals and plants;the search for plants and animals selectively accumulating tritium and its subsequent bioassay in water. It is necessary to develop the approaches to harmonization of tritium standards in water objects and potable water, in particular. Sanitary and hygiene standards are suggested to develop on the basis of health risk assessment in drinking water with tritium. The upcoming trend for assessing the contribution of organically bound tritium to the total human radiation dose is the local irradiation by tritium incorporated into DNA of cells and tissues and radiosensitive organs. The well-known and new methods of microdosimetry of DNA incorporated radionuclides are necessary to solve this problem.Keywords: natural and technogenic tritium, water biomonitoring, Lemna minor, Spirodela polyrhiza, health risk assessment, drinking water, the interventional level for tritium.

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“…Recently, an increased interest of the fate of tritium in vegetation generated a series of dedicated tritium research because photosynthesis is the first necessary step for the production of organic matter [2,[10][11][12][13]. The existing studies mainly focus on the routine release and short atmospheric HTO exposure at daytime [4,[11][12][13][14][15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Tritium concentration in soybean plants exposed to atmospheric HTO during nighttime and daytime

Shen

Liu

2016

NUCL SCI TECH

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Potted soybean plants were exposed to evaporate HTO for 1 h inside an exposure box at two different growth stage (flowering and podding stage, filling stage) during nighttime and daytime. The concentration of tissuefree water tritium (TFWT) and organically bound tritium (OBT) in leaves and beans was measured at the end of the exposure. The results indicated that the quasi-equilibrium between the TFWT concentrations in the soybean leaves and the HTO concentration of the ambient air moisture required more than 1 h to be reached. The relative TFWT concentrations in the nighttime represent about 1/2 to 2/3 of the concentrations obtained in the day in the leaves compared to about 1/2 to 4/3 in the beans. The relative OBT concentrations under night conditions were about 2/5 to 1/2 of those under day conditions in the leaves, contrary to 1/2-7/10 for the beans. By developing tritium concentration assessment model with a short-term release of atmospheric HTO, we comprehensively considered the plant growth stage and the environmental conditions.

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Current understanding of organically bound tritium (OBT) in the environment

Cited by 107 publications

References 53 publications

Hydrogen dynamics in soil organic matter as determined by <sup>13</sup>C and <sup>2</sup>H labeling experiments

Hydrogen dynamics in soil organic matter as determined by <sup>13</sup>C and <sup>2</sup>H labeling experiments

Radiological Problems of Tritium

Tritium concentration in soybean plants exposed to atmospheric HTO during nighttime and daytime

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Current understanding of organically bound tritium (OBT) in the environment

Cited by 107 publications

References 53 publications

Hydrogen dynamics in soil organic matter as determined by &lt;sup&gt;13&lt;/sup&gt;C and &lt;sup&gt;2&lt;/sup&gt;H labeling experiments

Hydrogen dynamics in soil organic matter as determined by &lt;sup&gt;13&lt;/sup&gt;C and &lt;sup&gt;2&lt;/sup&gt;H labeling experiments

Radiological Problems of Tritium

Tritium concentration in soybean plants exposed to atmospheric HTO during nighttime and daytime

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Product

Resources

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Hydrogen dynamics in soil organic matter as determined by <sup>13</sup>C and <sup>2</sup>H labeling experiments

Hydrogen dynamics in soil organic matter as determined by <sup>13</sup>C and <sup>2</sup>H labeling experiments