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. 2013 Oct 7;8(10):e74877. doi: 10.1371/journal.pone.0074877

Figure 5. Change of pH of K2S2O8 solution during reaction process in activated oxidation systems.

Figure 5

(A) UV/K2S2O8; (B) HT/K2S2O8; (C) Fe2+/K2S2O8; (D) US/K2S2O8.