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Tianyi Y, Farooq A, Mohiuddin M, Farooq A, Gonzalez NCT, Abbasi A, Hina A, Irshad M. Role of different organic and inorganic amendments in the biofortification of iodine in Coriandrum sativum crop. Front Ecol Evol 2023. [DOI: 10.3389/fevo.2023.1145979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/11/2023] Open
Abstract
Iodine deficiency disorder (IDDs) is one of the most prevailing and common health issues in mountainous communities. An effective way to control the prevalence and emergence of IDDs in remote areas is to use iodized salt. However, recent studies indicated that iodized salt is mostly lost during the cooking process. The current study of iodine biofortification differed from the previous studies in two main aspects: it involved exogenous organic iodine (OI), and inorganic iodine such as potassium iodide (KI), added in the amended soils, which previous studies did not consider. Moreover, the translocation, transformation, and distribution of iodine from soil to plants are poorly understood in amended soil. Thus, identifying an effective management option to enhance iodine (I) bioavailability in nutrient-deficient soils is currently a significant challenge. Therefore, a greenhouse study was conducted to investigate the effects of organic and inorganic soil amendments on the uptake of different iodine sources in coriander crops. Results showed that applying an inorganic iodine source significantly enhanced the iodine edible part of the crop compared to the control (p < 0.05). The application of soil amendments relatively improved iodine uptake by the coriander crop compared to the control. The highest iodine was found in crop tissues grown in wood ash-amended soil supplemented with KI (291.97 μg kg−1). The KI uptake was significantly higher than the OI (p < 0.05). Compared to OI, a higher translocation factor (0.96) and distribution coefficient (3.51) were found for plants treated with KI. Thus, this study indicates that a suitable soil amendment can be a better option for iodine biofortification and that it can serve as an alternative to iodized salt in preventing IDDs.
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Yamagami M, Yanai M. EFFECT OF RICE PLANT ROOT TTC-REDUCING ACTIVITY ON THE CHEMICAL FORM OF IODINE IN CULTIVATED SOIL SOLUTIONS. RADIATION PROTECTION DOSIMETRY 2022; 198:1189-1195. [PMID: 36083722 DOI: 10.1093/rpd/ncac149] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 05/22/2022] [Accepted: 05/26/2022] [Indexed: 06/15/2023]
Abstract
This study aimed to evaluate the effect of rice plant root activity on the chemical form of stable iodine (I) in a cultivated soil solution. Concentrations of I-, IO3- and organic-I were analyzed 4 days after exposure I- or IO3- solutions to each of the cultivated soil surface. When exposed to I-, its concentration in the cultivated soil was approximately the same as that in the non-planted soil. When the rhizosphere was exposed to IO3-, the I- concentration in the soil increased under cultivation conditions. IO3- remained undetected in the soil solution. The organic-I concentration in the cultivated soil solution was higher than that in the non-cultivated soil. Concentrations of organic-I increased under IO3- addition compared to I- addition. A weak positive correlation was observed between the TTC-reducing activity of plant roots, and the total and organic-I concentrations in the soil solution. It was suggested that the amount of organic I formed from IO3- was determined by the reducing activity of the roots.
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Affiliation(s)
| | - Masumi Yanai
- Institute for Environmental Sciences, Obuchi, Rokkasho-mura, Kamikita, Aomori, Japan
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Takeda A, Unno Y, Tsukada H, Takaku Y, Hisamatsu S. SOIL-SOIL SOLUTION DISTRIBUTION COEFFICIENT OF RADIOIODINE IN SURFACE SOILS AROUND SPENT NUCLEAR FUEL REPROCESSING PLANT IN ROKKASHO, JAPAN. RADIATION PROTECTION DOSIMETRY 2022; 198:1047-1051. [PMID: 36083751 DOI: 10.1093/rpd/ncac051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Revised: 03/07/2022] [Accepted: 03/18/2022] [Indexed: 06/15/2023]
Abstract
The soil-soil solution distribution coefficient (Kd) of radioiodine in soil samples with various total carbon (TC) contents was measured in a batch sorption experiment using 125I tracer spiked as I-. The log values of Kd-125I and TC concentration in low-TC soils (< 10g kg-1) were positively correlated, whereas those of Kd-125I in TC rich soils (> 10 g kg-1) and dissolved organic carbon (DOC) in liquid phase were negatively correlated. The proportion of 125I in the < 3 kDa fraction in the liquid phase is negatively correlated with the log of DOC, implying that 125I is primarily combined with high-molecular-weight organic matter in soil solutions rich in DOC. The results suggest that Kd-125I in soil with high soil organic material (SOM) content is governed by DOC via the combination of 125I and DOC. In contrast, Kd-125I in soils with a low SOM content was governed by SOM because the anion exchange capacity of SOM was vital for the sorption of 125I-.
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Affiliation(s)
- Akira Takeda
- Department of Radioecology, Institute for Environmental Sciences, Rokkasho, Japan
| | - Yusuke Unno
- Department of Radioecology, Institute for Environmental Sciences, Rokkasho, Japan
| | - Hirofumi Tsukada
- Department of Radioecology, Institute for Environmental Sciences, Rokkasho, Japan
- Institute of Environmental Radioactivity, Fukushima University, Fukushima, Japan
| | - Yuichi Takaku
- Department of Radioecology, Institute for Environmental Sciences, Rokkasho, Japan
- Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, Tsukuba, Japan
| | - Shunichi Hisamatsu
- Department of Radioecology, Institute for Environmental Sciences, Rokkasho, Japan
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Thiry Y, Tanaka T, Bueno M, Pisarek P, Roulier M, Gallard H, Legout A, Nicolas M. Recycling and persistence of iodine 127 and 129 in forested environments: A modelling approach. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 831:154901. [PMID: 35364144 DOI: 10.1016/j.scitotenv.2022.154901] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Revised: 03/22/2022] [Accepted: 03/25/2022] [Indexed: 06/14/2023]
Abstract
Differences in the source and behaviour of 129I compared to 127I isotopes have been described for a variety of surface environments, but little is known about the cycling rates of each isotope in terrestrial ecosystems. We developed a compartment model of the iodine cycle in a forest ecosystem, with a labile and non-labile pool to simplify the complex fate of iodine in the forest floor and soil. Simulations were performed using atmospheric 127I and 129I inputs for sites differing in climate, vegetation, and soil. In general, considering dry deposition in addition to wet deposition improved model simulations. Model results support the view that soil is the sink for atmospheric iodine deposited in forest ecosystems, while tree vegetation has little influence on long-term iodine budgets. Modelling also showed that iodine cycling reaches equilibrium after a period of about 5000 years, mainly due to a gradual incorporation of iodine into the bulk stabilised soil organic matter. At steady state, this pool of non-labile iodine in soil can retain about 20% of total deposition with a mean residence time of 900 years, while the labile iodine pool is renewed after 90 years. The proportions of modern anthropogenic 129I in each modelled pool reflect those of stable 127I at least several decades after input to the forest; this result explains why isotopic disequilibrium is common in field data analysis. Volatilisation plays a central role in regulating iodine storage in soil and, therefore, its residence time, while drainage is a minor export pathway, except at some calcareous sites. Dynamic modelling has been particularly helpful for gaining insight into the long-term response of iodine partitioning to continuous, single or even varying deposition. Our modelling study suggested that better estimates of dry deposition of atmospheric iodine, weathering of parent rock, and volatilisation of the deposited iodine from soil and vegetation will be required for reliable predictions of iodine cycling in specific forests, because these processes remain insufficiently explored.
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Affiliation(s)
- Yves Thiry
- Andra, Research and Development Division, 1-7 Rue Jean-Monnet, 92298 Châtenay-Malabry cedex, France.
| | - Taku Tanaka
- EDF R&D, LNHE, 6 Quai Watier, 78400 Chatou, France
| | - Maïté Bueno
- Universite de Pau et des Pays de l'Adour, E2S UPPA, CNRS, Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux, UMR 5254, Avenue du Président Angot, 64000 Pau, France
| | - Paulina Pisarek
- Andra, Research and Development Division, 1-7 Rue Jean-Monnet, 92298 Châtenay-Malabry cedex, France; Universite de Pau et des Pays de l'Adour, E2S UPPA, CNRS, Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux, UMR 5254, Avenue du Président Angot, 64000 Pau, France
| | - Marine Roulier
- Universite de Pau et des Pays de l'Adour, E2S UPPA, CNRS, Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux, UMR 5254, Avenue du Président Angot, 64000 Pau, France; Institute of Radiation Protection and Nuclear Safety (IRSN), PSE-ENV, SRTE, LR2T, CE Cadarache, 13115 Saint Paul les Durance Cedex, France
| | - Hervé Gallard
- IC2MP UMR 7285, Université de Poitiers, 86073 Poitiers Cedex 9, France
| | - Arnaud Legout
- INRAE Grand Est, UR 1138, Biogéochimie des Ecosystèmes Forestiers, F-54280 Nancy, France
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Roulier M, Carasco L, Orjollet D, Bueno M, Pannier F, Le Hécho I, Nicolas M, Coppin F. Iodine distribution and volatilization in contrasting forms of forest humus during a laboratory incubation experiment. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2022; 248:106872. [PMID: 35430501 DOI: 10.1016/j.jenvrad.2022.106872] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Revised: 03/19/2022] [Accepted: 03/22/2022] [Indexed: 06/14/2023]
Abstract
Radionuclides 129I (t1/2 = 15.7 × 106 years) and 131I (t1/2 = 8.02 days) are both introduced into the environment as a result of nuclear human activities. Environmental transfer pathways and fluxes between and within ecosystems are essential information for risk assessment. In forest ecosystems, humus degradation over time could result in re-mobilization and then downward migration and/or volatilization of intercepted 129I. In order to estimate the scale of these processes, humus (mull and moder forms) sampled under deciduous and coniferous forests were spiked with 125I- (t1/2 = 59.4 days), as a surrogate for 129I, in order to study the evolution of its water-soluble and organic fractions as well as the volatilization rate during humus degradation at laboratory scale. To our knowledge, this is the first time that interactions between iodine and contrasting forms of forest humus have been investigated. The evolution of native stable iodine (127I) pools in unspiked humus was also studied. The nature of the humus' organic matter appears to be a factor that impacts on the proportions of water-soluble and organic fractions of iodine and on their evolution. Iodine-125 was mainly organically bound (fraction for mulls and moders: ∼54-59 and 41-49%, respectively) and no clear evolution was observed within the 4-month incubation period. A large decrease in 125I water-solubility occurred, being more marked for mull (from ∼14-32 to 3-7%) than for moder (from ∼21-37 to 7-19%) humus. By contrast, a significant fraction was not extractible (∼38-43%) and varied in inverse proportion to the water-soluble fraction, suggesting a stabilization of iodine in humus after wet deposit. The nature of the humus organic matter also impacted on 125I volatilization. Although of the same order of magnitude, the total volatilization of 125I was higher for moders (∼0.039-0.323%) than for mulls (∼0.015-0.023%) within the 4-month incubation period. Volatilization rates for mulls were correlated with the water-soluble fraction, implying that volatilization of 125I could occur from the humus solution. Our results showed that humus is thus a zone of iodine accumulation by association with organic matter and that potential losses by lixiviation are significantly more important compared to volatilization.
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Affiliation(s)
- Marine Roulier
- Institute of Radiological Protection and Nuclear Safety IRSN, PSE-ENV/SRTE/LR2T, CE Cadarache, 13115, Saint Paul les Durance Cedex, France; CNRS/Univ. Pau & Pays de l'Adour/E2S UPPA, Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux, UMR 5254, Avenue du Président Angot, 64000, Pau, France.
| | - Loïc Carasco
- Institute of Radiological Protection and Nuclear Safety IRSN, PSE-ENV/SRTE/LR2T, CE Cadarache, 13115, Saint Paul les Durance Cedex, France.
| | - Daniel Orjollet
- Institute of Radiological Protection and Nuclear Safety IRSN, PSE-ENV/SRTE/LR2T, CE Cadarache, 13115, Saint Paul les Durance Cedex, France.
| | - Maïté Bueno
- CNRS/Univ. Pau & Pays de l'Adour/E2S UPPA, Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux, UMR 5254, Avenue du Président Angot, 64000, Pau, France.
| | - Florence Pannier
- CNRS/Univ. Pau & Pays de l'Adour/E2S UPPA, Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux, UMR 5254, Avenue du Président Angot, 64000, Pau, France.
| | - Isabelle Le Hécho
- CNRS/Univ. Pau & Pays de l'Adour/E2S UPPA, Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux, UMR 5254, Avenue du Président Angot, 64000, Pau, France.
| | - Manuel Nicolas
- Office National des Forêts ONF, Direction forêts et risques naturels, Département recherche, développement, innovation, Boulevard de Constance, 77300, Fontainebleau, France.
| | - Frédéric Coppin
- Institute of Radiological Protection and Nuclear Safety IRSN, PSE-ENV/SRTE/LR2T, CE Cadarache, 13115, Saint Paul les Durance Cedex, France.
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Pisarek P, Bueno M, Thiry Y, Legout A, Gallard H, Le Hécho I. Influence of tree species on selenium and iodine partitioning in an experimental forest ecosystem. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 809:151174. [PMID: 34699833 DOI: 10.1016/j.scitotenv.2021.151174] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Revised: 10/19/2021] [Accepted: 10/19/2021] [Indexed: 06/13/2023]
Abstract
Storage of selenium and iodine can greatly vary between forest ecosystems, but the influence of tree species on partitioning and recycling of those elements remains elusive. In this study, contents of Se and I were measured in tree compartments, litterfall, humus, and soil horizons in monospecific stands of Douglas fir, pine, spruce, beech, and oak under identical climatic and edaphic conditions. The cycle of each element was characterized in terms of stocks and fluxes. Lowest concentrations were in wood (Se: 8-13 μg kg-1; I: <16.5 μg kg-1). Senescing organs had higher Se and I content, than the living parts of trees due to direct exposure to atmospheric deposition, with some variation between coniferous and deciduous trees. For all stands, low amounts of Se and I were involved in biological cycle as reflected by low root uptake. In humus, the enrichment of elements greatly increased with the stage of organic matter (OM) degradation with average factors of 10 and 20 for Se and I. OM degradation and element persistence in humus was influenced by tree species. Deciduous trees, with low biomass, and fast degradation of OM stored less Se and I in humus compared to fir and spruce with high humus biomass. Interestingly, tree species did not affect soil reserves of Se and I. Concentration ranges were 331-690 μg Se kg-1 and 4.3-14.5 mg I kg-1. However, the divergent vertical profiles of the elements in the soil column indicated greater mobility of I. Selenium concentrations regularly decreased with depth in correlation with OM and Fe oxides content. For iodine, the maximum iodine concentration at a soil depth of 15 to 35 cm was caused by a parallel precipitation/sorption behavior of aluminium and organic iodine dissolved in the topsoil.
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Affiliation(s)
- Paulina Pisarek
- CNRS/Univ. Pau & Pays de l'Adour, Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux (IPREM), UMR 5254, 64053 Pau, France; Andra, Research and Development Division, Parc de la Croix Blanche, 92298 Châtenay-Malabry Cedex, France.
| | - Maïté Bueno
- CNRS/Univ. Pau & Pays de l'Adour, Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux (IPREM), UMR 5254, 64053 Pau, France
| | - Yves Thiry
- Andra, Research and Development Division, Parc de la Croix Blanche, 92298 Châtenay-Malabry Cedex, France
| | | | - Hervé Gallard
- IC2MP UMR 7285, Université de Poitiers, 86073 Poitiers Cedex 9, France
| | - Isabelle Le Hécho
- CNRS/Univ. Pau & Pays de l'Adour, Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux (IPREM), UMR 5254, 64053 Pau, France.
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Satoh Y, Imai S. Evaluation of radioiodine ( 129I) dissolution from sediment of a brackish lake beside a spent nuclear fuel reprocessing plant in Japan. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2021; 233:106608. [PMID: 33812179 DOI: 10.1016/j.jenvrad.2021.106608] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Revised: 03/18/2021] [Accepted: 03/22/2021] [Indexed: 06/12/2023]
Abstract
Dissolution fluxes of stable (127I) and radioactive (129I) isotopes of iodine from a brackish lake sediment beside a spent nuclear fuel reprocessing plant in Japan were evaluated through two kinds of experiments: incubation using a sediment core sample for 24 h, and observation of 127I and 129I concentrations in sedimentary pore water. For 127I, the dissolution flux evaluated in the incubation experiment was comparable with that obtained from the vertical gradient of 127I concentration in pore water in the observation experiment. This suggests that degradation of organic matter in the surface sediment is an important source of dissolved 127I found in the water. For 129I, the dissolution flux estimated in the incubation experiment showed negative values, indicating the transfer of 129I to the sediment from the overlying water (i.e., absorption). Moreover, the flux evaluated from the observation experiment was positive. This result suggests that degradation of organic matter in the surface sediment is scarcely important to the supply of 129I from the sediment to the water in the studied lake. The dissolution flux of 129I estimated in the observation experiment was smaller than the absorption flux of 129I in the incubation experiment. This potentially indicates that the dissolution of sedimentary 129I does not significantly change 129I concentrations in the water and sediment of the lake. This hypothesis was consistent with previous research conducted for the studied lake.
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Affiliation(s)
- Yuhi Satoh
- Department of Radioecology, Institute for Environmental Sciences (IES), 1-7 Rokkasho, Aomori, 039-3212, Japan.
| | - Shoko Imai
- Department of Radioecology, Institute for Environmental Sciences (IES), 1-7 Rokkasho, Aomori, 039-3212, Japan
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