Stability constants of iron(III) borate complexes
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The ultraviolet absorbance data from experiments conducted at constant pH and total iron concentration but variable B(OH)3 concentration were used to determined the stability constants of FeB(OH) 4 2+ and Fe[B(OH)4 2 + at 25°C and an ionic strength of 0.68. The estimates obtained were *β1 = 1.0 ± 0.2 × 10−2 and *β2 = 2 ± 1 × 10−5, respectively (uncertainties are two times the standard error of the estimates). A calculation of the extent of iron(III) borate formation in ocean water at pH 8.2 shows that iron(III) borates are not a significantly large component of iron(III) speciation in seawater.
Key wordsFerric iron ferric borate stability constant ultraviolet spectroscopy complexes
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