Date of Award


Degree Type


Degree Name

Master of Science in Oceanography



First Advisor

Dana Kester


The ultraviolet absorbance data from experiments conducted at constant pH, T(Fe), and variable [B(OH)3] were used to determine Fe*BB1 and Fe*BB2, the stability constants of FeB(OH)42+ and Fe(B(OH4)2+, respectively, in a 0.7 NaClO4 solution at 25*C. The data were analyzed taking into account the absorbances due to Fe3+ and FeOH2+. In addition, one or more ferric borate species were assumed to be present and the appropriate model was fitted to the data. The one species model (FeB(OH)42+) and the two species model (FeB(OH)42+ and Fe(b(OH4)2+) gave the best fits. However, the two species model was found to describe the ferric borate equilibrium better over a wider range of pH. The estimates obtained for the two ferric borate species model were FeB*B1 = 1.0 ± 0.2 x 10-2 and FeB*B2 = 2 ± 1 x 10-5. The model which included only FeB(OH)42+ estimated FeB*B1 = 5.7 ± 0.6 x 10-3. The contribution of FeB(OH)42+ and Fe(B(OH)4)2+ to iron speciation in seawater at pH 8.2 is not significant, based on the stability constants determined by the two species model.



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