title: Sorption and desorption of radiocesium on red earth and its solid components: relative contribution and hysteresis.
abstract: The relative contributions of organic matter and iron oxides to the Cs+ sorption on red earth were investigated by using the batch technique and selective extraction methods. The sorption and desorption isotherms and the distribution coefficients of Cs+ on the untreated red earth and the three treated soils to remove organic matter, iron oxides and organic matter plus iron oxides were determined at 20 degrees C, pH 6.3+/-0.2, in the presence of 0.01 mol/l CaCl2. It was found that all the isotherms are linear in the Cs+ concentration range used here, that the sorption desorption hysteresis on the red earth actually occurs, and besides the clay minerals, the organic matter present in the red earth is a significant trap of Cs+ and is responsible for the hysteresis instead of the iron oxides.
authors.affiliation: Radiochemistry Laboratory, College of Chemistry and Chemical Engineering, Lanzhou University, People's Republic of China.
authors.forename: W
authors.initials: W
authors.lastname: Xiangke
authors.forename: D
authors.initials: D
authors.lastname: Wenming
authors.forename: L
authors.initials: L
authors.lastname: Zhi
authors.lastname: Du Jinzhou
authors.forename: T
authors.initials: T
authors.lastname: Zuyi
mesh_terms: D000327:Adsorption; D002588:Cesium Radioisotopes / Q000032:analysis* / Q000737:chemistry; D012987:Soil / Q000032:analysis*; D012990:Soil Pollutants, Radioactive / Q000032:analysis*
chemical_list: D002588:Cesium Radioisotopes; D012987:Soil; D012990:Soil Pollutants, Radioactive