Effect of ferric chloride additions on the solubility of ferric ion in a near‐neutral soil

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Abstract
The concentration of ferric ion and the ion product of ferric hydroxide in the Weld loam (Aridic Paleustoll) were estimated from equilibria of EDTA (ethylenediaminetetraacetic acid) chelates. Additions of ferric chloride to the Weld loam raised the solubility of soil iron at least seven‐fold. The (Fe3+)(OH‐)3 ion product increased from approximately 10‐39.2 to at least 10‐38.4 after ferric chloride was added. The solubility of soil iron decreased slowly with time after fertilization. After one month the (Fe3+)(OH‐)3 ion product had fallen to 10‐39.1, virtually the same level as in the unamended soil. The results are consistent with the hypothesis that iron oxides of high specific surface or poor crystalinity control the solubility of ferric ion in soil solution.

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