The BRAG and GM2003 models for glass dissolution

TY - GEN

T1 - The BRAG and GM2003 models for glass dissolution

AU - Aertsens, Marc

A2 - Lemmens, Karel

A2 - Van Iseghem, Pierre

N1 - Score = 1

PY - 2007/12

Y1 - 2007/12

N2 - The GM2003 model extends the r(t) glass dissolution model with water diffusion through the diffusion layer. Boron and alkali diffusion through the diffusion layer is described by introducing a retention factor Kd,i between boron/alkali and water in the diffusion layer. Introducing a boron/alkali diffusion coefficient, the BRAG model describes boron/alkali diffusion in the diffusion layer as well. It is shown that both models are consistent with each other and an expression is derived for the boron/alkali diffusion coefficient (BRAG) as a function of both parameters of GM2003: the retention factor Kd,i and the water diffusion coefficient DH2O in the diffusion layer. From dissolution data only, it is possible to fit the value for the boron/alkali diffusion coefficient in the diffusion layer but due to correlations the individual values of both parameters Kd,i and DH2O of GM2003 cannot be determined. From theoretical considerations follows that the Kd,i value for boron/alkali should be slightly larger than 0.1 kg/liter. A user friendly code for the BRAG model allows automatic fits of glass dissolution data in water.

AB - The GM2003 model extends the r(t) glass dissolution model with water diffusion through the diffusion layer. Boron and alkali diffusion through the diffusion layer is described by introducing a retention factor Kd,i between boron/alkali and water in the diffusion layer. Introducing a boron/alkali diffusion coefficient, the BRAG model describes boron/alkali diffusion in the diffusion layer as well. It is shown that both models are consistent with each other and an expression is derived for the boron/alkali diffusion coefficient (BRAG) as a function of both parameters of GM2003: the retention factor Kd,i and the water diffusion coefficient DH2O in the diffusion layer. From dissolution data only, it is possible to fit the value for the boron/alkali diffusion coefficient in the diffusion layer but due to correlations the individual values of both parameters Kd,i and DH2O of GM2003 cannot be determined. From theoretical considerations follows that the Kd,i value for boron/alkali should be slightly larger than 0.1 kg/liter. A user friendly code for the BRAG model allows automatic fits of glass dissolution data in water.

KW - glass dissolution

KW - model

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_94985

UR - http://knowledgecentre.sckcen.be/so2/bibref/5616

M3 - In-proceedings paper

SN - 978-1-55899-942-8

BT - Scientific Basis for Nuclear Waste Management XXX, MRS Proceedings Volume 985

CY - Warrendale, Pennsylvania, United States

T2 - Materials Research Society Scientific Basis for Nuclear Waste Management XXX

Y2 - 27 November 2006 through 1 December 2006

ER -