Abstract
The solubility and diffusivity of oxygen in borate buffer solutions were studied on a Pt μ electrode under diffusion-controlled conditions. The solubility of oxygen in diluted borate solution is unusually high (4.2 × 10 −3 M l −1), whereas its diffusion coefficient is lower (5 × 10 −6 cm 2 s −1) than in other aqueous solutions The decrease in oxygen solubility at higher ionic strengths is due to the salting-out effect. The results are consistent with the formation of “oxygen-borate” complex whereby the stability of BO 3 containing polymeric anions is enhanced.
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