Repository logo

Browsing by Subject "LMWOA"

Filter results by typing the first few letters
Now showing 1 - 1 of 1
  • thumbnail.journal.alt
    Item type:Thesis, Access status: Restricted ,
    Wpływ kwasów organicznych na efektywność unieruchamiania ołowiu w postaci piromorfitu
    (Data obrony: 2014-09-29) Buczek, Renata
    Wydział Geologii, Geofizyki i Ochrony Środowiska
    Pyromorphite is formed in the soil by the application of the lead in situ immobilization using phosphate compounds is exposed in the rhizosphere of naturally occurring organic acids. Experiments were conducted to assess the effect of acids (citric, acetic, oxalic) previously complexed with $Pb$ (experiment 1) and without prior complexation (experiment 2), on the course and products of synthesis pyromorphite. Concentrations of $Pb^{2+}$, $PO{3\atop4}^{-}$, $Cl^{-}$ in samples and the pH of the solutions allowed to determine the effectiveness of $Pb$ immobilization and changes in the reaction system. It has been found that the factor determining the efficiency of immobilization $Pb$ in the presence of organic acids is pH (the protonation reaction of $Pb$), and the formation of $Pb$-acids complexes is secondary factor. XRD and SEM were used to identify the phase composition and morphology characteristics of the sediments. Acids affect morphology and growth of pyromorphite (dissolution and recrystallization reactions). Organic acids used in this study constitute a destabilizing factor crystallization of pyromorphite. Macroscopic observations of changes in concentrations in the solutions are not sufficient to identify the elementary reaction mechanisms.