Controls on silicate dissolution rates in neutral and basic pH solutions at 25°C

Brady, Patrick V.; Walther, John V.

doi:10.1016/0016-7037(89)90160-9

Cited by 400 publications

(161 citation statements)

References 22 publications

Supporting

Mentioning

146

Contrasting

Unclassified

Order By: Relevance

“…A similar pH-dependence has been observed for the dissolution rate of silicate minerals, for which the slope of the log rate versus pH plot is 0.3 at 70C and about 0.5 at 90*C [174,175]. The pH-dependence was attributed to the formation of negatively charged silica groups at the surface, and the temperature effect was attributed to the temperature dependence of the dissociation constant of silanol.…”

Section: Figures 19a and 19bsupporting

confidence: 70%

The effects of the glass surface area/solution volume ratio on glass corrosion: A critical review

Ebert

1995

View full text Add to dashboard Cite

Argonne National Lahoratory. wi1th facilitie, in the states of liiinois and Idaho. is owned by the united States govern lent, and operated by The Un diversity of Chicago under the provisions of a contract with thie department of Enery. DISCLAIM ER THE FFFECTS OF THE GLASS SURFACE AREA/SOLUTION VOLUME RATIO ON GLASS CORROSION: A CRITICAL REVIEW William L. Ebert ABSTRACTThis report reviews and summarizes the present state of knowledge regarding the effects of the glass surface area/solution volume (SA/V) ratio on the corrosion behavior of borosilicate waste glasses. The SA/V ratio affects the rate of glass corrosion through the extent of dilution ok corrosion products released from the glass into the leachate solution: glass corrosion products are diluted more in tests conducted at low SA/V ratios than they are in tests conducted at high SAN ratios. Differences in the solution chemistries generated in tests conducted at different SA/V ratios then affect the observed glass corrosion behavior. Corrosion of borosilicate waste glasses results in the dissolution of soluble components and the accumulation of sparingly soluble components in a layer on the surface of the corroding glass. Laboratory tests performed to distinguish the effects of the solution chemistry and the surface layer on the glass corrosion rate have shown the rate to be controlled primarily by the solution chemistry. Therefore, any testing parameter that affects the solution chemistry will also affect the glass corrosion rate. The results of static leach tests conducted to assess the effects of the SAN are discussed with regard to the effects of SAN on the solution chemistry. The effects of the SA/V ratio observed in static tests can be understood based on the effects of the solution chemistry on glass corrosion behavior. Test results show several remaining issues with regard to the long-term glass corrosion behavior: Can the SAN ratio be used as an accelerating parameter to characterize the advanced stages of glass corrosion relevant to long disposal times? Is the alteration of the glass surface the same in tests conducted at different SAN, and in tests conducted with monolithic and crushed glass samples? What are the effects of the SAN and the extent of glass corrosion on the disposition of released radionuclides? These issues will bear on the prediction of the long-term performance of waste glasses during storage. The results of an experimental program conducted at ANL to address these and other remaining issues regarding the effects of SA/V on glass corrosion are described. I 2 SUMMARYThis report reviews and summarizes the present state of knowledge regarding the effects of the glass surface area/solution volume ratio (SA/V) on the corrosion behavior of borosilicate waste glasses. The effects of the SA/ occur through dilution of corrosion products and through the effects of the corrosion products on the glass corrosion mechanism and rate. Therefore, the effects of the SA/V on glass corrosion are discussed in terms of the various effects of t...

show abstract

Section: Figures 19a and 19bsupporting

confidence: 70%

The effects of the glass surface area/solution volume ratio on glass corrosion: A critical review

Ebert

1995

View full text Add to dashboard Cite

show abstract

“…Because silicate solubility increases with pH (Brady and Walther 1989), the observed increase in pH with depth in lake sediment likely causes the dissolution of silicates and accounts for the increase in Si.…”

Section: Lake and Pore Watermentioning

confidence: 99%

“…Furthermore, Shar Burdiin and Guvany-2 lakes which had the highest 87 Sr/ 86 Sr ratio, are also the most alkaline lakes. This correlation between strontium isotopes and K, Na, Cl -, and U may be the result of the high solubility of silicates at high pH (Brady and Walther 1989). Intense weathering of silicates at high pH may increase the rate at which lake waters are imparted with the higher 87 Sr/ 86 Sr ratio of the silicates in lake sediment while simultaneously leaching U from the local rocks.…”

Section: Strontium Isotopes In Lakesmentioning

confidence: 99%

Geochemical evolution of uraniferous soda lakes in Eastern Mongolia

Linhoff

Bennett

Puntsag³

et al. 2010

Environ Earth Sci

View full text Add to dashboard Cite

“…Directly applicable to this study is the work of Eberl (1978) and Matsuda and Henmi (1983) where the transformation of smectites and kaolinite to rectorite was observed. The effects of high solution pH on silicate dissolution rates have been studied by Brady and Walther (1989), who showed that minerals in contact with high pH solutions have increased dissolution rates due to mineral surface speciation.…”

Section: Introductionmentioning

confidence: 99%

Low Temperature Experimental Investigation of the Effect of High pH Naoh Solutions on the Opalinus Shale, Switzerland

Chermak

1992

Clays and clay miner.

View full text Add to dashboard Cite

Abstract--Batch reactor experiments were performed at 150~ 175~ and 200~ to determine the effect of high pH NaOH solutions on the mineralogy of the Opalinus shale. In these experiments, the change in solution quench pH at 25~ solution composition, and mineralogy were monitored as a function of time for up to ~40 days. Runs were performed in 50 ml titanium hydrothermal reactor vessels. Each reactor was charged with 0.5-5.0 g of the 80-200 mesh size fraction of Opalinus shale, and 25 ml of solution (0. l and 0.01 M NaOH). The general sequence of reaction products observed under these high pH conditions include first the formation of analcime, followed by vermiculite, and finally Na-rectorite formation.

show abstract

Controls on silicate dissolution rates in neutral and basic pH solutions at 25°C

Cited by 400 publications

References 22 publications

The effects of the glass surface area/solution volume ratio on glass corrosion: A critical review

The effects of the glass surface area/solution volume ratio on glass corrosion: A critical review

Geochemical evolution of uraniferous soda lakes in Eastern Mongolia

Low Temperature Experimental Investigation of the Effect of High pH Naoh Solutions on the Opalinus Shale, Switzerland

Contact Info

Product

Resources

About