Investigation of Lead Hydrolytic Polymerization and Interactions with Organic Ligands in the Soil/Sediment-Water Environment Page: 17
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the previous section, Pb(II)- a type B metal has large stability constants. Complexation
in these cases involves covalent bonding and bidentate chelates are likely important.32
Other examples of humic material functional groups are shown in Figure 1.5.
OH COOH COOH
OH OH COOH
1, 2-Dihydroxybenzene (DHB) Salicylic Acid (SA) Phthalic Acid (PA)
pKl= 9.36, pK2 = 12.98 pKl= 2.98, pK2 = 12.38 pKl= 2.95, pK2 = 5.41
H H COOH
CC
HOOC COOH
OCH3
OH
Maleic Acid (MA) Vanillic Acid (VA)
pKl= 1.91, pK2 = 6.33 pKl= 4.36
Figure 1.5 Examples of humic material functional groups available from
* * 32,35,60
complexation reaction.32356
Nevertheless, toxic organic compounds can be broken down into nontoxic
constituents; barring transmutation, the potential toxicity of metals can never be
completely eliminated.33 The partitioning of metals between dissolved and sorbed on
solid phases critically influences metal transport, reactivity, and bioavailability. It is
widely recognized, however, that metal bioavailability and toxicity are not determined
merely by the total, dissolved metal concentrations. The distribution of the metal among
various inorganic and organic metal species governs bioavailability, which is related to
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Sanmanee, Natdhera. Investigation of Lead Hydrolytic Polymerization and Interactions with Organic Ligands in the Soil/Sediment-Water Environment, dissertation, December 2002; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc3314/m1/30/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .