Kinetics of Calcite Over Growth Precipitation By

Kinetics of Calcite Over Growth Precipitation
By
Ahmed L Rushdi
Department of Oceanography, Faculty of Science. Sana’a University, Sana’a, Republic of Yemen
Abstract
‘I1ie t/fects of iifferent TTIlJ1I61tLfWm·to·CIlfci.uconcenmuum. .m ratios ani tfu 4Jru of satuTatUm ill artificial seawater {J1l5’WJ upon tfie kinetics of calcium. car60nate solU ovewO’UJtIi.nave wen inflestiaautl. Tt is
shoum. tli.at tfu mechanlsm of CIlfciu OfIewO’UJtnprecipitation is a surface·control£u{ (interface) reaction in
tIi.tpresettCt as wt1£as in tfu aDsettCtof Ma in Jt5W, ‘Ifu reactum is a secoru£ortkT in Mgfru MW ani a
tli.iri ortkT in tfu presence of TtIIJfJ1Wi.u.m ion in Jt5W. ‘Ifu OfIeWO’UJtnreaction rases iecnase witn tfu incre.asi1tlJ~ concentrasio« in Jt5W. ‘Ifu iurease of reactum rou ani sfUjt from seconi order to tli.iri ortkT
TUlCtionconfirm tfie invo{vement of TtIIJfJ1Wi.u.ions m in OfIeTlJTO’UJtIi. reactio« 6y magnesian calcite OfItTlJTO’UJtIi.
precipitation. Surprisi1tlJ{y, tfu 4Jru of saturation as wt1£as tfie surface area an founa to affect tfie oraer
of tfu rauion. ‘Ifu reaction. order, in presettCt of MD'” uw to appToacn a second ortkT at liign attp’tt of suo
perstuurasio« ani fatal. surface area of caiau.