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Mutual Diffusion Coefficients of Water + Ethylene Glycol and Water + Glycerol Mixtures

1996; American Chemical Society; Volume: 41; Issue: 4 Linguagem: Inglês

10.1021/je9501705

1520-5134

G. Ternström, A. Sjöstrand, G. Aly, Å. Jernqvist,

Chemical and Physical Properties in Aqueous Solutions

The experimental technique and mathematical treatment for holographic interferometry, applied for the measurement for mass diffusivity, are described in detail. Experimental results at 25 °C are presented for three mixtures, water + NaCl, water + ethylene glycol, and water + glycerol. The water + NaCl mixture was used as a reference system to check the accuracy of this method. Measurements were conducted at three concentrations within the range 0.00874−0.0699 mass fraction NaCl. The results were compared to literature data and found to be within the variance of this measuring method. Measurements were conducted for the water + ethylene glycol system within the concentration range 0.0250−0.950 mass fraction ethylene glycol and within 0.0200−0.800 mass fraction glycerol for the water + glycerol system. Experimental results are compared to literature data where these data are available. The agreement for both systems are not as good as for the reference system. The mass diffusivity of the water + ethylene glycol system was found to vary from 11.70 to 3.75 × 10-10 m2 s-1 at a concentration of 0.0250 and 0.950 mass fraction ethylene glycol, respectively. The corresponding values for the water + glycerol system varied from 9.28 to 1.63 × 10-10 m2 s-1 at a concentration of 0.0200 and 0.800 mass fraction glycerol, respectively.