Fig. 4 Change in total dissolved As (both soils) and H₃AsO₃ (Santa soil) in the (a) flooded Santa soil, (b) flooded Palouse soil, (c) re-aerated Santa soil, and (d) re-aerated Palouse soil. Error bars denote one standard deviation. Total As, no P—; Total As, with P—; H₃AsO₃, no P—; H₃AsO₃, with P—

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