Fig. 2. Kinetic experiment monitoring the dissolved arsenic (As) concentrations in poultry litter aqueous suspensions for several known As species and for total dissolved As concentrations (y axis) in contact with an Al-based water treatment residual. Solid/solution ratio was 0.1 g mL–1 deionized H2O. C0 denotes the initial As concentration in the PL aqueous suspension before contact with the water treatment residual. Data are the average of two replicates ±1 SD. Monomethylarsonic acid was always <5 ppb and is not shown. DMA, dimethylarsinic acid; ROX, roxarsone.