“…Based on the estimations that roughly 1.3 Â 10 8 tonnes of chicken manure and 2.1 Â 10 8 tonnes of swine manure were produced from factory farming in China in 2009 (Ministry of Agriculture, 2010), the total amounts of arsenic contained in the chicken and swine wastes were up to 0.8 Â 10 5 e5.7 Â 10 6 and 0.9 Â 10 5 e2.5 Â 10 7 kg per year, respectively. Animal wastes, which are rich in nutrients and organic matter, are often disposed of by spreading to farm lands after storage in surface ponds and/or composting, as fertilizers (D'Angelo et al, 2012). As organoarsenic feed additives are highly water soluble, they can easily leach out of the manure and cause pollution of surface water and surface soils (Jackson et al, 2003;Rutherford et al, 2003).…”