shows the correlations between the contents of total
arsenic and TOC in the agricultural soils from the CAFO zone and
the Pearl River Delta. Animal manure is composed primarily of
organic matter, and contributes to soil fertility by increasing the
contents of organic matter and nutrients (e.g., nitrogen). Animal
wastes are disposed off on local farm lands as an organic fertilizer
in the CAFO zone, thus the surface soils receiving more animal
wastes should have higher levels of TOC and arsenic contributed
by the animal wastes