Thesis-2008-Titley.pdf (20.18 MB)
Download fileFundamental studies on metal–humic acid interactions
thesis
posted on 21.09.2018, 08:38 by Katie L. TitleyThere are three aims of this work. The first is to further knowledge on metal
binding to humic acids (HA's), particularly to further understand which functional
groups on the HA molecule metals complex to. The second is to find a method
which can provide direct evidence of the formation of ternary complexes of humic
acid, metal and carbonate. The third is to compare the stability constants of
metals to HA(aqueous) and to HA(solid).
Investigations are carried out at pH 6 using CPMAS SSNMR spectroscopy. Metal
binding to HA is explored using the following metals: Eu, Cd, Ce, Ca, Ba, Sr and
Zn. It is shown that a 2 ppm significant chemical shift difference is appropriate for
this work, and that only metals binding to the functional groups of interest or
close by can cause chemical shift differences above this. [Continues.]
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