The soil from Mount
Taishan had the largest potential Hg(II) adsorption capacity, though with less adsorptive intensity.
The percentages of Hg(II) desorbed
from all soil samples were less than 0.6%, which suggested that all the soils studied had a high binding strength for Hg(II). The soil
from Mount Taishan had a higher Hg(II) desorption capacity than the other soils, which indicated that the Hg(II) deposited on the
topsoil of Mount Taishan from atmosphere may easily discharge to surface water through runoff. Results of the FTIR spectroscopy
showed that the three soils contained the same functional groups.
The relative absorbencies of soil-Hg complexes changed significantly
compared with those of the soil samples and the adsorption of Hg(II) mainly acted on the O–H, C–O, and C=O groups of the soils.