Fraction | Ca | K | Mg | Na | |
---|---|---|---|---|---|
(mol kg−1) | (mol kg−1) | (mol kg−1) | (mol kg−1) | ||
pH 1 | Insoluble | 0.07ad | 0.13ad | 0.17ad | 0.31a |
Soluble | nd | nd | nd | nd | |
pH 3 | Insoluble | 0.11abcd | 0.18a | 0.22a | 0.50a |
Soluble | 0.14abcd | 0.06b | 0.03b | 1.69b | |
pH 5 | Insoluble | 0.12abcd | 0.28c | 0.55c | 0.97c |
Soluble | 0.16bcd | 0.07b | 0.11d | 2.32d | |
pH 7 | Insoluble | 0.09cd | 0.33c | 0.67e | 1.00c |
Soluble | 0.14d | 0.10bd | 0.17ad | 2.21d |