The desorption percentage for Pb(II)
is lower for the 85-Year paddy soil, ranging from 50.4%
to 57.9% (Table 3). This is similar to that observed with
the Cu(II) systems discussed above. The higher content
of organic matter and lower CEC are considered to be
responsible for the lower desorption percentage for Pb(II)
and Cu(II) observed for the 85-Year paddy soil.