2000s (Zhang et al., 2012b). Metals are mobile in the soil environment,
and the background levels might have been altered over the
past two decades by natural weathering processes, anthropogenic
inputs, and movement of metals among surface water, groundwater,
and the atmosphere. A few soils samples in the Pearl River
Delta contain arsenic at levels exceeding the range of arsenic content
in the CAFO zone, which might be attributed to land pollution
by mining and metal smelting activities in the west and north parts
of the region (Hu et al., 2013).
2000s (Zhang et al., 2012b). Metals are mobile in the soil environment,and the background levels might have been altered over thepast two decades by natural weathering processes, anthropogenicinputs, and movement of metals among surface water, groundwater,and the atmosphere. A few soils samples in the Pearl RiverDelta contain arsenic at levels exceeding the range of arsenic contentin the CAFO zone, which might be attributed to land pollutionby mining and metal smelting activities in the west and north partsof the region (Hu et al., 2013).
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