haramaya university

Initial concentration of each Cd(II), Pb(II), and Cr(VI) ions was varied from 20 to 100 mg/L. In separate flask, 25 mL of solutions containing different amounts of initial Cd(II), Pb(II), and Cr(VI) ions concentration with pH of 7, 6 and 2, respectively were added followed by 0.1 g of metal oxide powder. ................
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