Animal wastes from concentrated animal feeding operations (CAFOs) can cause soil arsenic pollution due
to the widespread use of organoarsenic feed additives. This study investigated the arsenic pollution of
surface soils in a typical CAFO zone, in comparison with that of agricultural soils in the Pearl River Delta,
China. The mean soil arsenic contents in the CAFO zone were elevated compared to those in the local
background and agricultural soils of the Pearl River Delta region. Chemical speciation analysis showed
that the soils in the CAFO zone were clearly contaminated by the organoarsenic feed additive, p-arsanilic
acid (ASA). Transformation of ASA to inorganic arsenic (arsenite and arsenate) in the surface soils was
also observed. Although the potential ecological risk posed by the arsenic in the surface soils was
relatively low in the CAFO zone, continuous discharge of organoarsenic feed additives could cause
accumulation of arsenic and thus deserves significant attention.