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The partitioning of arsenic and iron between solid and aqueous phases: a) the As/Fe ratio in the iron oxides of the sediments at the four sampling sites (Fig. 1), b) the As/Fe ratio in the groundwater at the same sites. The red line indicates the same As/Fe ratio in both panels. The green line in the right panel reflects 90% reprecipitation of the Fe released from the Fe-oxide phase.
