DISSOLUTION OF " FER DE LANCE" GYPSUM VARIETY KINETIC APPROACH | ||||
| Journal of Soil Sciences and Agricultural Engineering | ||||
| Article 7, Volume 27, Issue 10, October 2002, Page 7181-7191 PDF (3.23 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jssae.2002.255237 | ||||
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| Author | ||||
| A. Agib | ||||
| Deprtment of Soil -. Science and Soil Reclamation, Fac. of Agric., Teshreen Uni., P.O Lattakia, Syria. | ||||
| Abstract | ||||
| 9 grams of 90-240 Jim grain-size particles of gypsum in "fer de lance" were suspended in 500 ml of reagent solution ( water, NaHC03 10-3 N), stirred in a flask at 25 cC. The suspension was sampled through the time to insure the progress of dissolution. The dissolution curves of sol- and Ca2+, determined by chromatography ionic, showed a difference in the magnitude of the release of these two components of gypsum, and indicated that bicarbonate most likely enhances the dissolution. The analyses of experimental data using Davies and Transition State Theories indicated that the kinetic dissolution of gypsum especially in water seems to be a second order dependent process of surface reaction. The Bovengton-Jones plot is correctly verified for the experimental points succeeding the initial step of dissolution. The kinetic parameters determined by the application of Transition Theory may be extended to interpret the non adjustment of Bovengton-Jones plot in the initial stage of dissolution as an apparent fact due to the non linearity between the net rate of reaction Vne and the reaction free energy ~G. | ||||
| Keywords | ||||
| Gypsum; dissolution; kinetic; activation energy; transition state theory; diffusion; chemical reactlon.veaction rate | ||||
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