3.2. Effects of Inorganic Nitrogenous and Phosphorus Fertilizers on Arsenic Mobilization under Aerobic Incubation. In aerobic conditions, all of the microcosm incubations from both sampling sites ASYL718 and ASYC160 showed negligible monomethylarsonic acid (MMA) and dimethylarsinic acid (DMA) release from arsenic-containing sediments (data not shown). In addition, aqueous As(III) was insignificant (Figure 2).