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- W1993730227 abstract "The capacity of humic acids to bind metal ions is, at most, equal to the number of titratable H+-ions divided by the valency of the concerning metal ion. It is concluded that metal humates belong to the polynuclear chelates with cations binding predominantly to negatively charged ligand groupings of the humic acids. Judging from the magnitude of the pH-drop on addition of inorganic salts, there is at pH 5 no large difference in bond strength for the divalent ions Ba, Ca, Mg, Mn, Co, Ni, Fe and Zn (in this order only slightly increas ing). Pb (II), Cu (II) and Fe (III) ions, however, are (in this order) more firmly bound. At pH 5, Al ions seem to be quantitatively subject to the forming of hydroxide. On several grounds it is supposed that the humates of metals of the transition series are forming hydroxocomplexes at high pH, H - ions dissociating from water molecules covalently bound by the metal ion. In the mentioned order, these metal ions are more difficultly displaced by alkali or alkaline earth ions. As to the mechanism and the strength of the cation binding: there were only insignificant mutual differences between soil humic acids, notwithstanding differences in nitrogen content and in the ratio stronger and weaker acidic groups. The same holds for synthetic humic acids derived from polyhydroxibenzenes. Between these two groups, however, there are differences, presumably connected with a difference in the dissociation constants of the stronger acidic groups. The bond between humic acids and ions of the transition elements undoubtedly has a partly covalent character. There are indications that this is also the case with alkaline earth ions. “Competition” experiments between humic acids and some known chelators, and copper, gave some indications of the conditional stability constants of copper humates." @default.
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- W1993730227 date "1971-01-01" @default.
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- W1993730227 title "Cation binding of humic acids" @default.
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- W1993730227 doi "https://doi.org/10.1016/0016-7061(71)90024-3" @default.
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