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- W2094243126 abstract "By employing a membrane-covered polarographic oxygen electrode, the oxygen diffusion coefficients and solubilities in aqueous solutions of ammonium chloride, potassium iodide, sodium alginate, sodium carboxymethylcellulose (CMC), and xanthan gum have been measured with a newly developed methodology. Experimental results showed that in all systems studied, oxygen solubilities decrease on addition of solutes. Oxygen diffusion coefficients in aqueous solutions of KI and NH4C1 are found to be higher than that in pure water. In sodium alginate solutions, dilute xanthan solutions, and solutions containing more than 0.3 wt% of CMC, oxygen diffusion coefficients decrease with an increase in polymer concentrations. Interestingly, in dilute CMC solutions and concentrated xanthan solutions containing more than 0.5 wt% of xanthan gum, oxygen diffusion coefficients increase with increasing polymer concentrations, and values exceeding that in pure water are generally observed.On a mesure grǎce a une methode nouvellement mise au point, qui utilise une electrode a oxygene polarographique recouverte d'une membrane, les coefficients de diffusion de l'oxygene et les solubilites dans des solutions aqueuses de chlorure d'ammonium, de iodure de potassium, d'alginate de sodium, de carboxymehyl cellulose de sodium (CMC) et de gomme de xanthane. Les resultats experimentaux montrent que dans tous les systemes etudies, les solubilites de l'oxygene diminuent avec l'addition de solutes. On a trouve que les coefficients de diffusion de l'oxygene dans des solutions aqueuses de KI et de NH4Cl sont plus grands que dans l'eau pure. Dans les solutions d'alginate de sodium, les solutions de xanthane diluee et les solutions contenant plus de 0,3% en poids de CMC, les coefficients de diffusion de l'oxygene diminuent avec une augmentation de la concentration en polymeres. Curieusement, dans des solutions de CMC dilue et des solutions de xanthane concentree contenant plus de 0,5% en poids de gomme de xanthane, les coefficients de diffusion de l'oxygene augmentent avec la concentration de polymeres, et on observe generalement des valeurs excedant celles obtenues avec l'eau pure." @default.
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- W2094243126 date "1989-06-01" @default.
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- W2094243126 title "The structure-breaking effect on oxygen diffusion coefficients in electrolyte and polyelectrolyte solutions" @default.
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- W2094243126 doi "https://doi.org/10.1002/cjce.5450670319" @default.
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