The
stability constants (log) for the complexes of Cu(II) with
citric acid (H4L), for example, are 6.1 (CuHL) and 18
(CuL), and those for Pb(II) are 5.2 (PbHL) and 12.3 (PbL).
Although both the Cu(II) and Pb(II) complexes have high
stability, the stability constants for the complexes of Cu(II)
are greater than those for Pb(II). Similar results were
reported for the complexes of Cu(II) and Pb(II) with soil
humic acid, and the stability constants for the Cu-humic
acid complexes are also greater than those for the Pbhumic
acid complexes (Pandey et al., 2000). Therefore,
soil organic matter has a greater anity for Cu(II) than
that for Pb(II).
Thestability constants (log ) for the complexes of Cu(II) withcitric acid (H4L), for example, are 6.1 (CuHL) and 18(CuL), and those for Pb(II) are 5.2 (PbHL) and 12.3 (PbL).Although both the Cu(II) and Pb(II) complexes have highstability, the stability constants for the complexes of Cu(II)are greater than those for Pb(II). Similar results werereported for the complexes of Cu(II) and Pb(II) with soilhumic acid, and the stability constants for the Cu-humicacid complexes are also greater than those for the Pbhumicacid complexes (Pandey et al., 2000). Therefore,soil organic matter has a greater anity for Cu(II) thanthat for Pb(II).
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