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Browsing by Subject "gluconic acid"

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    Item type:Thesis, Access status: Restricted ,
    Wpływ kwasu glukonowego na rozpuszczalność piromorfitu
    (Data obrony: 2013-09-13) Borowicz, Paweł
    Wydział Geologii, Geofizyki i Ochrony Środowiska
    Phosphate-induced lead immobilization method is based on the fact that newly formed mineral, pyromorphite, is a highly insoluble phase. However, there is a number of factors capable of decreasing stability of pyromorphite. Among them are low-molecular-weight organic acids (LMWOA) secreted to the soil by numerous species of microorganisms and plants. Presented studies investigate the relation between pyromorphite and gluconic acid (GA), one of the most common LMWOA in the soil. The conducted experiments includes dissolution of pyromorphite in the presence of GA, having regard to the pH of the solution or concentration of GA, and formation of pyromorphite in the presence of GA (homogeneous and heterogeneous transformations). The studies indicate that GA increase the dissolution of pyromorphite through decreasing pH of the solution, Pb-organic complexation and increasing the ionic strength of the solution. GA inhibits growth of pyromorphite crystals through formation of complexes with crystal seeds and reducing activity coefficient of lead cations.