3.3. Effects of Inorganic Phosphorus Fertilizers on Arsenic Mobilization under Anaerobic Incubation. In anaerobic conditions, all of the microcosm incubations from both sampling sites ASYL718 and ASYC160 did not exhibit arsenic mobilization, including As(V), MMA, and DMA (data not shown). We therefore presented only As(III) concentrations in Figures 3 and 4.