干旱区生态环境知识资源中心(Arid): Upscaling Radionuclide Retardation?Linking the Surface Complexation and Ion Exchange Mechanistic Approach to a Linear Kd Approach

Arid

DOI	10.2172/15014299
报告编号	UCRL-TR-204713
来源ID	OSTI_ID: 15014299
	Upscaling Radionuclide Retardation?Linking the Surface Complexation and Ion Exchange Mechanistic Approach to a Linear Kd Approach
	Zavarin, M; Carle, S; Maxwell, R
英文摘要	The LLNL near-field hydrologic source term (HST) model is based on a mechanistic approach to radionuclide retardation-that is, a thermodynamic description of chemical processes governing retardation in the near field, such as aqueous speciation, surface complexation, ion exchange, and precipitation The mechanistic approach allows for radionuclide retardation to vary both in space and time as a function of the complex reaction chemistry of the medium. This level of complexity is necessary for near-field HST transport modeling because of the non-linear reaction chemistry expected close to the radiologic source. Large-scale Corrective Action Unit (CAU) models-into which the near-field HST model results feed-require that the complexity of the mechanistic approach be reduced to a more manageable form (e.g. Linear, Langmuir, or Freundlich sorption isotherms, etc). The linear sorption isotherm (or K{sub d}) approach is likely the most simple approach for large-scale CAU models. It may also be the most appropriate since the reaction chemistry away from the near field is expected to be less complex and relatively steady state. However, if the radionuclide retardation approaches in near-field HST and large-scale CAU models are different, they must be proved consistent. In this report, we develop a method to link the near-field HST and large-scale CAU model radionuclide retardation approaches.
出版年	2004
报告类型	Technical Report
语种	英语
国家	美国
来源学科分类	73 NUCLEAR PHYSICS AND RADIATION PHYSICS ; 58 GEOSCIENCES ; 38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY ; 54 ENVIRONMENTAL SCIENCES ; CHEMISTRY ; ION EXCHANGE ; ISOTHERMS ; LAWRENCE LIVERMORE NATIONAL LABORATORY ; PRECIPITATION ; RADIOISOTOPES ; SORPTION ; SOURCE TERMS ; THERMODYNAMICS ; TRANSPORT
URL	http://www.osti.gov/scitech/servlets/purl/15014299
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/268739
推荐引用方式 GB/T 7714	Zavarin, M,Carle, S,Maxwell, R. Upscaling Radionuclide Retardation?Linking the Surface Complexation and Ion Exchange Mechanistic Approach to a Linear Kd Approach,2004.