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Residual concentration and/or removal of (a) CYN, (c) H2O2, (e) Fe(II), Fe(III), and total iron in methanol–free ultrapure water, and (b) CYN, (d) H2O2, (f) Fe(II), Fe(III), and total iron in ultrapure water containing 513.3 µM of methanol. Initial pH about 5.0, H2O2/Fe(II) molar ratio of 0.4, and 30 min reaction. Error bars represent the standard deviation of the mean based on three replicates.
