The dialysis method of metal ion speciation is investigated as a technique to determine complexing capacities of soil fulvic acid (SFA) towards Cu2+, Cd2+, Mn2+, Ni2+, and Zn2+, between pH 5 and 7. The complexing capacity values for each metal ion usually increase as pH increases. At the same pH the values for Cd2+, Mn2+, Ni2+, and Zn2+, are similar, but Cu2+ values are significantly higher. The results are interpreted on the basis of a model involving the aggregation of SFA by metal ions, especially Cu2+.
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Rainville et al. (1982) studied this question.
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