Table 161

Possible Reactions of Al3+ in the Soil Solution log K (at 25°C)

1. Hydrolysis reactions

Al3+ + H2O = Al(OH)2+ + H+ Al3+ + 2H2O = Al(OH)2+ + 2H+ Al3+ + 3H2O = Al(OH)30 + 3H+ Al3+ + 4H2O = Al(OH)4" + 4H+

2. Polymerization

3. Complexation with inorganic anions

4. Complexation with organic anions

Al3+ + oxalate2" = (Al-oxalate)+ Al3+ + citrate3" = (Al-citrate)0 Al3+ + fulvate"" = (Al-fulvate)(""3)"

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