Iodine, bromine and chlorine contents in solls and plants of Japan

Yuita, Kouichi; Nobusawa, Yumiko; Shibuya, Masao; Aso, Shotaro

doi:10.1080/00380768.1982.10432390

“…The average iodine concentration in the 8 rice paddy soils studied, 1.6 ppm, was signi® cantly lower than that in the 8 upland soils we analyzed, 23 ppm. Yuita et al (1982a;1982b) also found that the iodine levels in paddy soils were much lower than those in forest and upland soils in Niigata and other places in Japan.…”

Section: Concentrations Of Iodine In Soilsmentioning

confidence: 91%

“…Bowen (1979) reported mean iodine concentrations in soils collected worldwide as 5 ppm, although the concentration range is expected to be very wide. Some studies on the iodine concentrations in Japanese soils (Yuita et al 1982a(Yuita et al , 1982bMuramatsu and Yoshida 1993) have indicated that the iodine level in Japanese upland ® elds and forest soils is very high (up to » 60 ppm) but in paddy ® elds is considerably lower. Since the iodine concentrations in soils are generally much higher than their possible parent materials (e.g., rocks, terrestrial plants), it should be interesting to determine the mechanisms for accumulation of this element in the soil environment.…”

mentioning

confidence: 99%

Effects of Microorganisms on the Fate of Iodine in the Soil Environment

Muramatsu¹,

Yoshida²

1999

Geomicrobiology Journal

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“…In soil, mass transport is expressed by means of the mass conservation equation. For a condition of vertical one-dimensional ( 2 ) where the symbols are as given in the nomenclature.…”

Section: Iodate Migration Modelmentioning

confidence: 99%

Sorption and Migration of Radioiodine in Saturated Sandy Soil

Nishimaki

¹

,

Satta

²

,

Maeda

³

1994

Journal of Nuclear Science and Technology

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Using lZ51 as tracer, the migration of iodide and iodate in a solvent flowing steadily through saturated sandy soil was examined in column experiment and analyzed theoretically, with particular reference to the effect of differences in pH value. Runs a t pH 3, medial pH and pH 10 were performed to determine breakthrough data from radioactivity measurements on the effluent solution.'The results obtained from column experiments indicated that, for the same pH, sandy soil sorbed iodate ('25103-) more strongly than iodide (lZSI-), and that, for the same chemical form, more effective sorption is shown a t lower than a t high pH. This indicated that the sorption behavior of iodine in sandy soil depended significantly on their chemical form and on pH-i.e. the hydrogen ion concentration in the influent solution.The strong sorption of iodate under medial pH and pH 3-evidenced by the breakthrough data-was simulated numerically, based on mathematical expressions representing a combination of instantaneous (equilibrium) and limited-rate (non-equilibrium) sorption processes. Unknown parameters incorporated in the model were determined by a procedure of fitting the mathematically derived curves to the observed plots for different experimental conditions, as a result of which good agreement was obtained of the calculated curves with the observed breakthrough plots.

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“…In soil, mass transport is expressed by means of the mass conservation equation. For a condition of vertical one-dimensional ( 2 ) As a rule, breakthrough curves of radioactive solution displacement through soil can be described as a single sorption process, i.e. depicting a Henry type isotherm.…”

Section: Iodate Migration Modelmentioning

confidence: 99%

“…Equations ( 1 ) and ( 6 ) are simplified inform to by defining the following dimensionless parameters and factors :…”

Section: Simulationmentioning

confidence: 99%

Sorption and Migration of Radioiodine in Saturated Sandy Soil.

Nishimaki

¹

,

Satta

²

,

Maeda

³

1994

J. Nucl. Sci. Technol.

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Using lZ51 as tracer, the migration of iodide and iodate in a solvent flowing steadily through saturated sandy soil was examined in column experiment and analyzed theoretically, with particular reference to the effect of differences in pH value. Runs a t pH 3, medial pH and pH 10 were performed to determine breakthrough data from radioactivity measurements on the effluent solution.'The results obtained from column experiments indicated that, for the same pH, sandy soil sorbed iodate ('25103-) more strongly than iodide (lZSI-), and that, for the same chemical form, more effective sorption is shown a t lower than a t high pH. This indicated that the sorption behavior of iodine in sandy soil depended significantly on their chemical form and on pH-i.e. the hydrogen ion concentration in the influent solution.The strong sorption of iodate under medial pH and pH 3-evidenced by the breakthrough data-was simulated numerically, based on mathematical expressions representing a combination of instantaneous (equilibrium) and limited-rate (non-equilibrium) sorption processes. Unknown parameters incorporated in the model were determined by a procedure of fitting the mathematically derived curves to the observed plots for different experimental conditions, as a result of which good agreement was obtained of the calculated curves with the observed breakthrough plots.

show abstract

Iodine, bromine and chlorine contents in solls and plants of Japan

Cited by 14 publications

References 3 publications

Effects of Microorganisms on the Fate of Iodine in the Soil Environment

Effects of Microorganisms on the Fate of Iodine in the Soil Environment

Sorption and Migration of Radioiodine in Saturated Sandy Soil

Sorption and Migration of Radioiodine in Saturated Sandy Soil.

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