Availability to plants of zinc sorbed by soil and hydrous iron oxides

Comparison of EDTA and sequential extraction tests for phytoavailability prediction of manganese and zinc in agricultural alkaline soils

“…Other researches have also found Zn to be associated with Fe-Mn oxides (Ma and Rao, 1997;Obrador et al, 2002;Alvarez and Rico, 2003). According to Stanton and Burger (1967), the Fe oxides in soils play a predominant role in limiting Zn availability to plants growing directly in the soil. This may be partially due to the high stability constants of Zn oxides.…”

Removal of Cd(II) and Cu(II) from Aqueous Solution by Na+-Modified Pisha Sandstone

“…Pisha sandstone (PS) is a type of loose rock composed of thick layers of sandstone, sandy shale, and shale [19]. On the one hand, it has a high cation exchange capacity (45.8 cmol•kg − 1 ) and variable charge due to its high iron oxides (18.6%) and aluminum oxides (14.5%) [20,21]. PS also contains carbonate minerals and aluminosilicate minerals, both of which are considered beneficial for heavy metals removal [22].…”

Sorption of copper and lead by hydrous ferric oxide

“…The sorption of Hg2+ by several substrates is depressed by complexation of Hg2+ by Cl- (1,12), and the sorption of Cu2+ by hydrous ferric oxide is depressed by the formation of Cu-NHa complexes (5). On the contrary, an enhancement of Zn2+ sorption on amorphous iron and aluminum oxides in the presence of phosphate has been observed (13). This effect has been explained as a bridging between metal ions and surface sites.…”