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Disappearance of Aluminum Tridecamer from Hydroxyaluminum Solution in the Presence of Humic Acid

^a National Institute for Agro-Environmental Sciences, 3-1-3 Kan-nondai, Tsukuba, Ibaraki 305-8604, Japan
^b Graduate School of Agriculture and Life Science, The Univ. of Tokyo, Yayoi, Bunkyo, Tokyo 113-8657, Japan

View larger version (18K): [in a new window]   Fig. 1. Changes in the concentrations of (a) aluminum tridecamer (Al13), (b) undefined species other than Al13 or AlSYM including aggregated or precipitated Al that cannot be detected by NMR (AlNON), and (c) Al monomer and dimer (AlSYM) and (d) in pH with aging time (10 mmol L–1 hydroxyaluminum [HyA] solution). Humic acid carboxy group versus Al ratios (COOH/Al) are 0 (open square), 0.07 (open triangle), 0.15 (open inverted triangle), and 0.38 (open circle).

View larger version (13K): [in a new window]   Fig. 2. Concentrations of undefined species other than Al13 or Alsym including aggregated or precipitated Al that cannot be detected by NMR (AlNON) (open triangle) and precipitated Al (open circle) as a function of the humic acid carboxyl group versus Al ratios (COOH/Al) after 0.007 and 570 d of aging [10 mmol L–1 hydroxyaluminum (HyA) solution].

View larger version (26K): [in a new window]   Fig. 3. Concentrations of (a, d) aluminum tridecamer (Al13), (b, e) undefined species other than Al13 or AlSYM, including aggregated or precipitated Al that cannot be detected by NMR; (AlNON), and (c, f) Al monomer and dimer (AlSYM) as a function of humic acid carboxyl group versus Al ratios (COOH/Al) after 0.007 (a, b, c) and 570 d (d, e, f) of aging. Total Al concentrations are 5 (closed triangle) and 10 mmol L–1 (closed circle).

View larger version (20K): [in a new window]   Fig. 4. The relationship between the amounts of humic acid added and moles of aluminum tridecamer (Al13) lost from solution within 0.007 d of aging. Total Al concentrations are 5 (open circle) and 10 mmol L–1 (closed circle).

View larger version (27K): [in a new window]   Fig. 5. The concentration of precipitated Al as a function of time [10 mmol L–1 hydroxyaluminum (HyA) solution]. The humic acid carboxyl group versus Al ratios (COOH/Al) are 0 (open square), 0.07 (open triangle), 0.22 (open inverted triangle), and 0.39 (open circle).