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. 2016 Oct 3;6:34378. doi: 10.1038/srep34378

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Pareto chart representing the effect of each factor on the adsorption of (a) Cu(II) and (b) Cr(VI) in the descending order from greatest to lowest contribution for FFD: (A) pH, (B) temperature, (C) initial concentration of metal ions, (D) CaCl₂, (E) HA.