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Title: Evaluation of Solution Composition Aluminoborosilicate Waste Glass Dissolution at 40°C

Abstract

Single-pass flow-through experiments were conducted with aluminoborosilicate waste glasses to evaluate how changes in solution composition affect the dissolution rate (r) at 40°C and pH(23°C) = 9.0. The three prototypic low-activity waste (LAW) glasses; LAWE-1A, -95A, and -290A, used in these experiments span a wide range covering the expected processing composition of candidate immobilized low-activity waste (ILAW) glasses. Results suggest incongruent release of Al, B, Na, and Si at low flow-rate (q) to sample surface area (S) [log10 (q/S) < -8.9 (m/s)] whereas congruent release was observed at high q/S [log10 (q/S) > -7.9 (m/s)]. Forward dissolution rates, based on boron release, are the same irrespective of glass composition, evident by the dissolution rates being within the experimental error of one another [r1A = 0.0301 ±0.0153 g/(m2 d), r95A = 0.0248 ±0.0125 g/(m2 d), and r290A = 0.0389 ±0.0197 g/(m2 d)]. Finally these results support the use of a chemical affinity based rate law to describe glass dissolution as a function of solution composition.

Authors:
; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
910004
Report Number(s):
PNNL-SA-52923
14592; 830403000; TRN: US0704032
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: Preprints of extended abstracts presented at the ACS National Meeting, American Chemical Society, Division of Environmental Chemistry, 2007, 47(1):125-134
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 36 MATERIALS SCIENCE; BOROSILICATE GLASS; ALUMINIUM OXIDES; WASTE FORMS; DISSOLUTION; FLOW RATE; SURFACE AREA; CHEMICAL COMPOSITION; LOW-LEVEL RADIOACTIVE WASTES; CHEMICAL REACTION KINETICS; dissolution kinetics; low-activity waste glass; LAW; Environmental Molecular Sciences Laboratory

Citation Formats

Richards, Emily L., Davis, Aaron M., and Pierce, Eric M. Evaluation of Solution Composition Aluminoborosilicate Waste Glass Dissolution at 40°C. United States: N. p., 2007. Web.
Richards, Emily L., Davis, Aaron M., & Pierce, Eric M. Evaluation of Solution Composition Aluminoborosilicate Waste Glass Dissolution at 40°C. United States.
Richards, Emily L., Davis, Aaron M., and Pierce, Eric M. Thu . "Evaluation of Solution Composition Aluminoborosilicate Waste Glass Dissolution at 40°C". United States. doi:.
@article{osti_910004,
title = {Evaluation of Solution Composition Aluminoborosilicate Waste Glass Dissolution at 40°C},
author = {Richards, Emily L. and Davis, Aaron M. and Pierce, Eric M.},
abstractNote = {Single-pass flow-through experiments were conducted with aluminoborosilicate waste glasses to evaluate how changes in solution composition affect the dissolution rate (r) at 40°C and pH(23°C) = 9.0. The three prototypic low-activity waste (LAW) glasses; LAWE-1A, -95A, and -290A, used in these experiments span a wide range covering the expected processing composition of candidate immobilized low-activity waste (ILAW) glasses. Results suggest incongruent release of Al, B, Na, and Si at low flow-rate (q) to sample surface area (S) [log10 (q/S) < -8.9 (m/s)] whereas congruent release was observed at high q/S [log10 (q/S) > -7.9 (m/s)]. Forward dissolution rates, based on boron release, are the same irrespective of glass composition, evident by the dissolution rates being within the experimental error of one another [r1A = 0.0301 ±0.0153 g/(m2 d), r95A = 0.0248 ±0.0125 g/(m2 d), and r290A = 0.0389 ±0.0197 g/(m2 d)]. Finally these results support the use of a chemical affinity based rate law to describe glass dissolution as a function of solution composition.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Mar 01 00:00:00 EST 2007},
month = {Thu Mar 01 00:00:00 EST 2007}
}

Conference:
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