Fig. 2 OH formation and speciation in the PAA – Fe(II) system.

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Fig. 2 OH formation and speciation in the PAA – Fe(II) system. OH formation and speciation in the PAA – Fe(II) system. (A) OH concentration versus time by mixtures of PAA and Fe(II) in dark or light (320 nm). Data are corrected for the sum of Fe(II)- and PAA-only controls. The reaction kinetics observed in the laboratory system closely mimics the OH formation kinetics observed for the field samples shown in Fig. 1A. (B) Absorbance of 5 μM each of PAA (5 μM, green), Fe(III) from FeCl3 at 3 and 4 μM, Fe(II) from FeSO4 (5 μM, yellow), and mixtures of 1:1 Fe(II) (FeSO4) + PAA (5 μM each) (red line) in aqueous solution adjusted to pH 3.5. After reacting for a few minutes, the 5 μM 1:1 mixture of Fe(II) and PAA results in an absorption spectrum identical to Fe(III), indicating the fast conversion of Fe(II) to Fe(III) and consistent with OH formation burst observed in Fig. 1A and panel (A). Suzanne E. Paulson et al. Sci Adv 2019;5:eaav7689 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY).