title: Variation in available cesium concentration with parameters during temperature induced extraction of cesium from soil.
abstract: Cesium extraction behavior of brown forest type soil collected from paddy fields in Fukushima nuclear accident affected areas was studied. In nitric acid or sulfuric acid solutions at elevated temperature, the concentration of Cs in soil available for extraction, m0, has been estimated on the basis of modified canonical equation and the equations derived from assumed equilibria. With the variation in temperature, mixing time, and soil to solvent ratio, the observed m0 values in 0.5 M acid solution ranged between 1.5 and 2.9 mg cesium per kilogram of soil. By increasing the acid concentration to 3 M, the value of m0 could be sharply increased to 5.1 mg/kg even at 95 °C. This variation in the extractable concentration of cesium with the parameters signifies the existence of different binding sites in the soil matrix. The results observed for uncontaminated sample could be reproduced with the radioactive cesium contaminated sample belonging to the same soil group.
authors.affiliation: Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, 305-8565, Japan. Electronic address: parajuli.durga@aist.go.jp.
authors.forename: Durga
authors.initials: D
authors.lastname: Parajuli
authors.affiliation: Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, 305-8565, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Takahashi
authors.affiliation: Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, 305-8565, Japan.
authors.forename: Hisashi
authors.initials: H
authors.lastname: Tanaka
authors.affiliation: Fukushima Agricultural Technology Center, 116 Shimonakamichi, Takakura, Hiwada-machi, Koriyama, 963-0531, Japan.
authors.forename: Mutsuto
authors.initials: M
authors.lastname: Sato
authors.affiliation: Tokyo Power Technology Ltd., 5-5-13, Toyosu, Koto-ku, Tokyo, 135-0061, Japan.
authors.forename: Shigeharu
authors.initials: S
authors.lastname: Fukuda
authors.affiliation: Tokyo Power Technology Ltd., 5-5-13, Toyosu, Koto-ku, Tokyo, 135-0061, Japan.
authors.forename: Ryuichi
authors.initials: R
authors.lastname: Kamimura
authors.affiliation: Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, 305-8565, Japan. Electronic address: tohru.kawamoto@aist.go.jp.
authors.forename: Tohru
authors.initials: T
authors.lastname: Kawamoto
mesh_terms: D002586:Cesium / Q000032:analysis*; D012990:Soil Pollutants, Radioactive / Q000032:analysis*; D013696:Temperature
chemical_list: D012990:Soil Pollutants, Radioactive; D002586:Cesium
keywords: Canonical equation; Cs in soil; Decontamination; Extraction