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. 2015 Sep 23;10(9):e0138891. doi: 10.1371/journal.pone.0138891

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© 2015 Liu et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 3 — 150 mL of FeSO₄·7H₂O solution with addition of ■: 1.80 mL of H₂O₂ at 2 h (treatment 1); ●: 0.90 mL of H₂O₂ at 2 and 14 h (treatment 2); ▲: 0.60 mL of H₂O₂ at 2, 14, and 26 h (treatment 3); ○: 0.45 mL of H₂O₂ at 2, 14, 26, and 38 h (treatment 4); □: 0.36 mL of H₂O₂ at 2, 14, 26, 38, and 50 h (treatment 5).