Adsorptive removal of naturally occurring trace toxins from water : case studies in arsenic(V) and estrogens
Naturally occurring toxins such as arsenic(V) and estrogens harm human health at trace level for long-term exposure. Though distinct in chemical characteristics, both toxins can be efficiently treated by adsorption. The study demonstrates the wide application of adsorption techniques in the removal of naturally occurring toxins from water at trace level. Both toxins were quantified at[Mu]gL⁻¹ level using mass spectrometry. [Beta]-FeOOH granulated ferric hydroxide were employed to remove arsenic under different conditions. Two Iowa soils, Hanlon and Zook, with different organic content and clay percentage, were used for estrogen sorption experiment. Maximum sorption capacities as modeled by Freundlich model were 500 ([Mu]g/g)(L/[Mu]g)[superscript n] for arsenic(V) by granulated ferric hydroxide, 0.795([Mu]g/g)(L/[Mu]g)[superscript n] for 17[Beta]-estradiol by Zook soil and 0.632 ([Mu]g/g)(L/[Mu]g)[superscript n] for estrone by Hanlon soil.