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Residual concentration and removal of CYN by the Fenton process for various H2O2/Fe(II) molar ratios in (a) methanol–free ultrapure water and (b) ultrapure water containing 513.3 µM of methanol. Initial pH about 5.0, 25 µM of H2O2, 7.4 to 125 µM Fe(II), and 30 min reaction. Error bars represent the standard deviation of the mean based on two replicates.
