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Elemental composition (mg/L) of the leachate solution (left) and the recovered stripping solution after the second stripping step (right). Conditions retention (left): polySILP 20%, 0.50 ± 0.01 g; catalyst leachate 1:7 w/w, 2.50 ± 0.010 g; flow rate, 3 mL/min. Conditions stripping cycle 2 (right): polySILP 20%, 0.50 ± 0.01 g after stripping cycle 1; 1.0 M thiourea/1.0 M HCl, 60.0 ± 0.10 g; flow rate, 3 mL/min.
