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Fig. 1. Change of initial arsenate (As^V) and phosphate (P^V) concentration and their molar ratio in soil solution with increasing amounts of goethite application to the artificial quartz substrate (G-0 = 0 g kg^–1; G-1 = 1 g kg^–1; G-4 = 4 g kg^–1). Soil solution was sampled after allowing 6 d for equilibration. Values given represent the mean of all suction cup positions within each treatment.

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