title: Evaluation of the readsorption of plutonium and americium in dynamic fractionations of environmental solid samples.
abstract: A dynamic extraction system exploiting sequential injection (SI) for sequential extractions incorporating a specially designed extraction column is developed to fractionate radionuclides in environmental solid samples such as soils and sediments. The extraction column can contain up to 5 g of a soil sample, and under optimal operational conditions it does not give rise to creation of back pressure. Attention has been placed on studies of the readsorption problems during sequential extraction using a modified Standards, Measurements and Testing (SM&T) scheme with four-step sequential extractions. The degree of readsorption in dynamic and conventional batch extraction systems is compared and evaluated by using a double-spiking technique. A high degree of readsorption of plutonium and americium (>75%) was observed in both systems, and they also exhibited similar distribution patterns of the two radionuclides. However, the dynamic system is fully automated, eliminates manual separations, significantly reduces the operational time required, and offers detailed kinetic information.
authors: Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 207, 2800 Kgs Lyngby, Denmark. toey@kemi.dtu.dk
authors: Roongrat
authors: R
authors: Petersen
authors: Xiaolin
authors: X
authors: Hou
authors: Elo Harald
authors: EH
authors: Hansen
mesh_terms: D000327:Adsorption; D000576:Americium / Q000737:chemistry*; D005591:Chemical Fractionation / Q000295:instrumentation* / Q000379:methods; D011005:Plutonium / Q000737:chemistry*; D012990:Soil Pollutants, Radioactive / Q000737:chemistry
chemical_list: D012990:Soil Pollutants, Radioactive; D011005:Plutonium; D000576:Americium