KINETIC APPROACH OF CALCIUM CARBONATE SOLUBILITY AFFECTED BY IONIC STRENGTH OF WATER IN SOME CALCAREOUS SOILS OF NORTHERN IRAQ

This 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 110-4, 12710-4,52010-4, 104010-4 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 110-3 to 3010-3 day-1 in the first order equation and from 2810-3 to 69810-3 mg.kg-1.day-1/2 in diffusion equation for all locations.