Estimation of air-to-grass mass interception factors for iodine

Karunakara, N.; Ujwal, P.; Yashodhara, I.; Kumara, Karthik; Mohan, M.P.; Shenoy, K. Bhasker; Dileep, B.N.; James, J. P.; Ravi, P. M.

doi:10.1016/j.jenvrad.2017.06.018

Cited by 4 publications

(4 citation statements)

References 16 publications

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“…Bowley (2013) found that washing did not significantly decrease vegetation I concentrations, which indicates that I was not superficially retained, but inside the leaves, a finding replicated by Humphrey et al (2019). Karunakara et al (2018) showed that pasture can potentially intercept large quantities of I, with mass interception factors of 0.25 to 7.7 m 2 kg −1 , although decreasing with rainfall and total I.…”

Section: Resultsmentioning

confidence: 99%

“…not superficially retained, but inside the leaves, a finding replicated by Humphrey et al (2019). Karunakara et al (2018) showed that pasture can potentially intercept large quantities of I, with mass interception factors of 0.25 to 7.7 m 2 kg −1 , although decreasing with rainfall and total I. Competition for soil sorption sites from other seawater anions, particularly halogens, may increase the potential for plant uptake and leaching (Sheppard et al, 1995).…”

Section: Factors Affecting Pasture Iodine Concentrationsmentioning

confidence: 90%

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Environmental Parameters Affecting the Concentration of Iodine in New Zealand Pasture

et al. 2019

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Iodine (I) is an essential trace element commonly deficient in agricultural systems. Whereas there is much information on I in food crops, there is a lacuna of knowledge on the environmental factors that affect pasture I concentrations. We aimed to identify the most important environmental factors affecting the concentration of I in New Zealand pastures, and the consequences to agricultural systems. Soil and pastoral samples were collected throughout the country and analyzed for I and other elements. The soils contained 1.1 to 86 mg I kg−1, with 0.005 to 1.4 mg kg−1 in the pasture. In 26% of pastures, I concentrations were insufficient for sheep nutrition, whereas 87% contained insufficient I for cattle nutrition. Pasture I concentrations were negatively correlated with the distance from the sea, and the concentration of oxalate‐extractable amorphous Al, Fe, and Si oxides, which immobilize soil I. Soil organic C and clay increased I retention in soil but did not significantly affect pasture I concentrations. Future work should investigate how soil properties affect pasture I uptake in inland areas. Core Ideas 87% of New Zealand pastures contained insufficient iodine for cattle. Pasture I levels are higher close to the sea. Pasture I levels are lower in soil that is high in Fe and Al (oxyhydr)oxides.

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Section: Resultsmentioning

confidence: 99%

Section: Factors Affecting Pasture Iodine Concentrationsmentioning

confidence: 90%

Environmental Parameters Affecting the Concentration of Iodine in New Zealand Pasture

et al. 2019

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“…Bean leaf Environmental chamber, 131 I. (Singhal et al, 2004) Finally, based on closed field experiments (environmental chamber), with the emission of gaseous 127 I on grass, Karunakara et al (2018) propose dry deposition velocities of (0.51-3.3) × 10 -3 cm.s -1 , whereas with the emission of gaseous 131 I on bean leaves, Singhal et al (2004) propose 5.4 × 10 -5 cm.s -1 . These values differ by several orders of magnitude from those obtained during this study and from data produced during experiments in the environment.…”

Section: × 10 −5mentioning

confidence: 99%

“…Numerous studies have shown that the dry deposition velocities of iodine are highly dependent on the one hand on the state of iodine in the atmosphere: gaseous or particulate including in this last case the particle size, and on the other on the chemical species encountered (Nielsen, 1981;Noguchi and Murata, 1988). On grass, the dry deposition velocity of gaseous elemental iodine measured in the environment by Chamberlain and Chadwick (1966) was 1.8 cm.s -1 , while Karunakara et al (2018) measured dry deposition velocities of between 0.5 × 10 -3 and 3.3 × 10 -3 cm.s -1 in an environmental chamber. These values differ by several orders of magnitude, since no parameterisation was done for meteorological values or surface properties of the grass.…”

Section: Introductionmentioning

confidence: 99%

Measurement and modelling of gaseous elemental iodine (I2) dry deposition velocity on grass in the environment

Bah

Hébert

Connan

et al. 2020

Journal of Environmental Radioactivity

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Assessing the impact of radioactive iodine on humans subsequent to a nuclear accident requires a better understanding of its behaviour in the environment. An original approach aimed at developing a model constrained by data collected during experimental campaigns has been developed. These experimental campaigns, named MIOSEC 2 and MIOSEC 3 respectively, were conducted in the middle of grassland. They are based on emissions of gaseous elemental iodine (I 2) into the atmosphere above the grassland to determine the dry deposition velocities of iodine on the grass and to model these velocities as a function of the environmental conditions, particularly wind friction velocity, sensible heat flux, and stomatal resistance. The measured dry deposition velocities were between 0.02 and 0.49 cm.s-1 during MIOSEC 2, varying by more than one order of magnitude, and between 0.48 and 1.25 cm.s-1 during MIOSEC 3. The dry deposition model for iodine developed as a result of these experiments relies on the micrometeorological characteristics of the atmospheric surface layer, the pertinent physical and chemical properties of the iodine and the surface properties of the grass; all the se parameters were measured at the time of the experiments. Given the experimental conditions, the modelled dry deposition velocities varied between 0.11 and 0.51 cm.s-1 during MIOSEC 2 and between 0.31 and 1.6 cm.s-1 during MIOSEC 3. The dry deposition model for iodine indicates that the variations in deposition velocity are induced by the mechanical turbulence, since there is significant correlation between the dry deposition velocities of iodine and the wind friction velocities on grass. The model also s hows that the higher deposition velocity values during MIOSEC 3 are due to the fact 2 that the stomata were more open during the experiments. There is also significant correlation between the experimental results and modelled values both for MIOSEC 2 (R 2 = 0.61) and for MIOSEC 3 (R 2 = 0.71).

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Monitoring in animal breeding in response to nuclear or radiological emergencies: Chernobyl experience

Фесенко

Kashparov

Levchuk

et al. 2021

Journal of Environmental Radioactivity

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Estimation of air-to-grass mass interception factors for iodine

Cited by 4 publications

References 16 publications

Environmental Parameters Affecting the Concentration of Iodine in New Zealand Pasture

Environmental Parameters Affecting the Concentration of Iodine in New Zealand Pasture

Measurement and modelling of gaseous elemental iodine (I2) dry deposition velocity on grass in the environment

Monitoring in animal breeding in response to nuclear or radiological emergencies: Chernobyl experience

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