| Autor: |
Joseph Georges, Alain Berthold |
| Rok vydání: |
1983 |
| Předmět: |
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| Zdroj: |
Analytica Chimica Acta. 147:41-51 |
| ISSN: |
0003-2670 |
| DOI: |
10.1016/0003-2670(83)80071-3 |
| Popis: |
Oxygen can be determined in a perfluorotributylamine emulsion used as a blood substitute by coulometry and polarography. The oxygen uptake of the emulsion (4.3 × 10−3 mol l−1 or 11 ml-% at 25°C and PO2 = 760 mm Hg) is about three times greater than that of water. The adsorption of surfactant on a dropping mercury electrode changes the electrochemical parameters E 1 2 , α and k3. The marked difference between the diffusion coefficients of oxygen and hydrogen peroxide (ratio 2.6) seems to be proceed from the ejection of oxygen molecules from the perfluorotributylamine droplets and from the insolubility of hydrogen peroxide molecules in the droplets. The constant rate of oxygen release by these droplets was estimated to be 104 s−1 by a stopped-flow spectrophotometric method. This constant rate seems to be linked with the particle diameter (0.2 μm) and the diffusion coefficient in the perfluorotributylamine droplets (1.6 × 10−6 cm2 s−1). |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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