Correlation of Heavy Metal Ions Binding Capacity with Geochemical components in River Sediment
| Autor: | Yu,Jun-Hao, 游竣皓 |
|---|---|
| Rok vydání: | 2019 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 107 The existence of heavy metals in river sediment could be divided into 6 forms: exchangeable, bound to carbonates, bound to manganese oxides, bound to iron oxides, bound to organic matters, and residuals. To realize the binding behavior between heavy metals (Cu, Ni, Co, Cr, Zn, and Pb) and geochemical components (Carbonates, Manganese oxides, Iron oxides, organic matters), different methematic models were used to express the relationship. Langmuir equation, Freundlich equation and Dubinin-Radushkevich equation (D-R equation) isothermal adsorption equations also used to fit the adsorption behavior. Sediments collected from higher heavy metals contaminated rivers (the Yenshui, Ell-ren) and from lower heavy metals contaminated rivers (Tsengwen, Chishui, Potzu, and Peikang Rivers), located in southern Taiwan, existed different relationship between geochemical componenets and aqua-regia extractable heavy metals which were contaminated from industry, domestic, and agricultural wastewater. The aqua-regia extractable heavy metals in the Yenshui and Ell-ren river sediment correlated linearly with heavy metal bound to per unit weight carbonates, and be expressed with linear empirical mathematic model. However, the linear correlations were not significant for the sediment collected from the Tsengwen, Chishui, Potzu, and Peikang Rivers which have lower heavy metals pollution, except Zn. The correlations between aqua-regia extractable heavy metal and heavy metals bound to per unit weight manganese oxides in heavily polluted Yenshui and Ell-ren river sediment were significant and could be expressed as empirical linear model. However, the correlations in the Tsengwen, Chishui, Potzu, and Peikang Rivers were not significant, except Zn. The aqua-regia extractable heavy metals (Ni, Co, Cr, Zn, and Pb) correlated well in exponential model and had positive significant correlation with metals bound to per unit weight iron oxides in the Yenshui river sediment. Similarly, the exponential correlations for Cu, Ni, Cr, Zn, and Pb in Ell-ren river sediment were high. The correlations between total heavy metal contents and heavy metals bound to per unit weight iron oxides in scarcely polluted river sediment could be expressed as empirical linear model. The exponential correlation coefficient between aqua-regia extractable heavy metals (Co, Cr, Pb, Cu, and Ni) and metals bound to OM in per unit weight of OM were high in the Yenshui river sediment. The correlations at serious metal contamination river sediment can be defined in empirical mathematic model. In description of the adsoption behavior of heavy metals into geochemical components of river sediments, the multilayer adsorption of isothermal Freundlich equation fitted well with higher coefficients of determination (R2) than those of Langmuir equation and Dubinin-Radushkevich equation (D-R equation). |
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