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Controlling the Fate of Roxarsone and Inorganic Arsenic in Poultry Litter

^a Environmental Geochemistry Lab., Univ. of Texas at San Antonio, TX 78249
^b Dep. of Chemistry, Univ. of Texas at San Antonio, TX, 78249

View larger version (16K): [in this window] [in a new window]   Fig. 1. Several dissolved known arsenic (As) species and total dissolved As concentrations (y axis) monitored in poultry litter aqueous suspensions with a 0.1 g mL–1 deionized H2O solid/solution ratio. Dissolved monomethylarsonic acid concentrations were always <7 ppb (not shown). Total dissolved As (triangles) data correspond to the right y axis. Total dissolved As data were obtained with graphite furnace atomic absorption spectroscopy, and dissolved As species concentrations were obtained with liquid chromatography–inductively coupled plasma mass spectrometry. Data are the average of two replicates ±1 SD. DMA, dimethylarsinic acid; ROX, roxarsone.

View larger version (16K): [in this window] [in a new window]   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.

View larger version (16K): [in this window] [in a new window]   Fig. 3. Interactive effect of water treatment residuals amendment rate and incubation time on reducing As availability in water treatment residual–amended poultry litter samples at 70% moisture incubated at 23°C (top) and 35°C (bottom). Data are expressed as the mean of two replicates ±1 SD.

View larger version (19K): [in this window] [in a new window]   Fig. 4. Interactive effect of water treatment residual amendment rate and incubation time at 10% rate by weight on reducing known As species concentrations in water treatment residuals–amended poultry litter samples incubated at 23°C (top) and 35°C (bottom). Data are expressed as the mean of two replicates ±1 SD. DMA, dimethylarsinic acid; MMA, monomethylarsonic acid; ROX, roxarsone.

View larger version (15K): [in this window] [in a new window]   Fig. 5. Full electrospray ionization mass spectrometry graphs for the unamended (no water treatment residual) poultry litter water extract after 2 h. The OrgCu legend for the peak = 352.0 m/z refers to the speculated roxarsone metabolite containing one Cu and three N2O molecules. Rox, roxarsone.