Linearity of Iodine Sorption and Sorption Capacities for Seven Soils

Sheppard, Marsha I.; Hawkins, Janice L.; Smith, Paul A.

doi:10.2134/jeq1996.00472425002500060014x

Cited by 22 publications

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“…Thus, the main natural source of iodine in the surface soil is considered to be atmospheric iodine derived from the ocean and falling on the earth's surface, mainly as iodine incorporated into precipitation. Sheppard (1996) reviewed the collective published studies and outlined the ability of soils to sorb iodine, the existing forms of iodine sorbed by soils, and the mechanisms of iodine sorption and desorption. Iodine, in both I-and 10,-forms, is sorbed depending on the general properties of soils to sorb anions: partly to soil organic matter and partly to iron and aluminum hydrous oxides and clay (especially allophane).…”

Section: Iodine Content In the Uppermost Soil Horizonsmentioning

confidence: 99%

Behavior of Iodine in a Forest Plot, an Upland Field, and a Paddy Field in the Upland Area of Tsukuba, Japan: Vertical Distribution of Iodine in Soil Horizons and Layers to a Depth of 50 m

Yuita

Kihou

2005

Soil Science and Plant Nutrition

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In the course of a series of studies conducted to investigate the long‐term behavior of 129I (which has a half‐life of 16 million years) in the environment, the vertical distribution of stable iodine (127I) in the soil horizons and layers to a depth of 50 m was determined in a forest plot, an upland field, and a paddy field in the upland area of Tsukuba, Japan. The iodine content was strongly controlled by the groundwater level and by the oxidation‐reduction conditions of the soil horizons/layers. In the forest plot and the upland field, the iodine content was the highest in the oxidative surface horizons (0–0.3 m), ranging from 42 to 71 mg kg−1. The iodine content decreased with increasing depth, falling sharply at depths below the mean water table (depth of about 2.5 m) to a low value of around 0.1 mg kg−1 at the lowest depth of the Joso Clay layer (first aquiclude) (depth of about 5.0 m). In the paddy field, the surface Apg horizon (0–0.18 m) showed a low iodine content of 2.8 mg kg−1, with eluviation of iodine under strongly reductive conditions. The mildly oxidative 2Bw horizon (0.60–0.89 m) showed the highest iodine content (12.0 mg kg−1) among the horizons in the paddy field, with illuviation of iodine. At depths below the mean water table during the non‐irrigation period (depth of about 1.25 m), the iodine content decreased with increasing depth to a low value of 0.09 mg kg−1 at the lowest depth of the Joso Clay layer (depth of about 4.3 m), as in the forest plot and the upland field. Below the Joso Clay layer, the iodine content at all the sites was, without exception, lower than that in the corresponding vadose oxidative layers. The upper layers of the Narita Formation (second aquiclude) at all the sites showed the highest iodine content (0.5–5.0 mg kg−1) below the Joso Clay layer, but these values were almost the same or lower than those of the reductive surface horizons (0–0.6 m) in the paddy field. In another layers, the iodine content ranged from 0.01 to 1.0 mg kg−1, the lowest content recorded to a depth of 50 m at all the sites.

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Section: Iodine Content In the Uppermost Soil Horizonsmentioning

confidence: 99%

Behavior of Iodine in a Forest Plot, an Upland Field, and a Paddy Field in the Upland Area of Tsukuba, Japan: Vertical Distribution of Iodine in Soil Horizons and Layers to a Depth of 50 m

Yuita

Kihou

2005

Soil Science and Plant Nutrition

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“…Plusieurs auteurs ont montré que, pour une teneur en matière organique constante, la teneur en iode croît avec la teneur en argiles. D'autres mettent en évidence une corrélation positive de la sorption avec la teneur en oxydes de fer et d'aluminium, notamment dans les sols acides (Sheppard et al, 1996 ;Dai et al, 2004).…”

Section: Iodeunclassified

“…Les observations montrent en effet que les sols riches en matière organique sont également riches en iode (Fuge et Johnson, 1986 ;Evans et Hammad, 1995 ;Muramatsu et Yoshida, 1996). Sheppard et al (1996) montrent que la sorption de l'iode (iodure) est très bien corrélée positivement avec le carbone organique dissous de la solution du sol alors que Dai et al (2004) établissent une corrélation négative entre la quantité d'iode (iodate) sorbée et la matière organique (la corrélation faisant également intervenir le fer libre). Il existerait des processus d'iodination des acides humiques sous l'influence d'enzymes extracellulaires de type peroxydases (Christiansen, 1990).…”

Section: Kdunclassified

“…Cependant, Sheppard (2003) observe une augmentation significative du Kd de sorption de l'iode entre deux mesures faites à 24 h et 14 jours et Bostock et al (2003) mettent en évidence l'existence de deux processus d'association avec la matière organique, l'un rapide et l'autre lent. La sorption de l'iode est bien représentée par des isothermes de Freundlich et/ou de Langmuir (Sheppard et al, 1996 ;Dai et al, 2004). La désorption (après 153 jours de sorption) n'est que de 0 à 24 % de l'iode sorbée selon Sheppard et al (1996) et de 12 à 18 % selon Dai et al (2004), témoin d'une irréversibilité partielle de la sorption.…”

Section: Kdunclassified

“…La sorption de l'iode est bien représentée par des isothermes de Freundlich et/ou de Langmuir (Sheppard et al, 1996 ;Dai et al, 2004). La désorption (après 153 jours de sorption) n'est que de 0 à 24 % de l'iode sorbée selon Sheppard et al (1996) et de 12 à 18 % selon Dai et al (2004), témoin d'une irréversibilité partielle de la sorption.…”

Section: Kdunclassified

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Comportement de radionucléides (Cs, I, Sr, Se, Tc) dans le sol : proposition de valeurs de Kd par défaut

Roussel-Debet

Colle

2005

Radioprotection

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The atmospheric transport of iodine‐129 from Fukushima to British Columbia, Canada and its deposition and transport into groundwater

Herod

Suchy

Cornett

et al. 2015

Water Resources Research

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The Fukushima-Daiichi nuclear accident (FDNA) released iodine-129 (15.7 million year half-life)and other fission product radionuclides into the environment in the spring and summer of 2011. 129 I is recognized as a useful tracer for the short-lived radiohazard 131 I, which has a mobile geochemical behavior with potential to contaminate water resources. To trace 129 I released by the FDNA reaching Canada, preaccident and post-accident rain samples collected in Vancouver, on Saturna Island and from the National Atmospheric Deposition Program in Washington State were measured. Groundwater from the AbbotsfordSumas Aquifer was sampled to determine the fate of 129 I that infiltrates below the root zone. Modeling of vadose zone transport was performed to constrain the travel time and retardation of 129 I. The mean preaccident 129 I concentration in rain was 31 3 10 6 atoms/L (n 5 4). Immediately following the FDNA, 129 I values increased to 211 3 10 6 atoms/L and quickly returned to near-background levels. However, pulses of elevated 129 I continued for several months. The increases in 129 I concentrations from both Vancouver and Saturna Island were synchronized, and occurred directly after the initial release from the FDNA. The 129 I in shallow ( 3 H/ 3 He age <1.4 years) Wassenaar et al. (2006) groundwater showed measurable variability through March 2013 with an average of 3.2 3 10 6 atoms/L (n 5 32) that was coincident with modeled travel times for Fukushima 129 I. The groundwater response and the modeling results suggest that 129 I was partially attenuated in soil, which is consistent with its geochemical behavior; however, we conclude that the measured variability may be due to Fukushima 129 I entering groundwater.

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Linearity of Iodine Sorption and Sorption Capacities for Seven Soils

Cited by 22 publications

References 0 publications

Behavior of Iodine in a Forest Plot, an Upland Field, and a Paddy Field in the Upland Area of Tsukuba, Japan: Vertical Distribution of Iodine in Soil Horizons and Layers to a Depth of 50 m

Behavior of Iodine in a Forest Plot, an Upland Field, and a Paddy Field in the Upland Area of Tsukuba, Japan: Vertical Distribution of Iodine in Soil Horizons and Layers to a Depth of 50 m

Comportement de radionucléides (Cs, I, Sr, Se, Tc) dans le sol : proposition de valeurs de Kd par défaut

The atmospheric transport of iodine‐129 from Fukushima to British Columbia, Canada and its deposition and transport into groundwater

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