KINETIC APPROACH OF CALCIUM CARBONATE SOLUBILITY AFFECTED BY IONIC STRENGTH OF WATER IN SOME CALCAREOUS SOILS OF NORTHERN IRAQ
Mesopotamia Journal of Agriculture,
2011, Volume 39, Issue 3, Pages 37-44
AbstractThis study reveal four locations from north Iraq having different soils orders classified to series level namely: Zawaita - 653CEE - Mollisols. Batail – 452CCW – Vertisols. Nineveh forest – 432 CCF – Inceptisols. Tel-Afer – 453CCW – Aridisols. We used in this study four types of water having different ionic strength 1×10-4, 127×10-4,520×10-4, 1040×10-4 mol.L-1 had been used. According to Kinetics approach the results showed that the first order and diffusion equations were successfully used to describe carbonate dissolution in comparison with zero order, Eluvich and power function equations by using least value of (S.E) and higher value of (R2). Rate coefficient of calcium carbonate dissolution was increased with increasing ionic strength of water from 1×10-3 to 30×10-3 day-1 in the first order equation and from 28×10-3 to 698×10-3 mg.kg-1.day-1/2 in diffusion equation for all locations.
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