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Abstract:

In view of the uncertainty aboui the exact water activity.(a w ) of some solutions (saturated and unsaturated) used as references sources, the use of unsaturated NaCl solutions as isopiestic standards for calibration of hygrometers is proposed. It is shown that there is an excellent agreement on the exact value of NaCl solutions between various literature compilations and theoretical models. Further, it is also shown that in the important range (for food related applications) of 15–50°C the a w of NaCl solutions is almost invariant. Copyright © 1984, Wiley Blackwell. All rights reserved

Registro:

Documento: Artículo
Título:Unsaturated Solutions of Sodium Chloride as Reference Sources of Water Activity at Various Temperatures
Autor:CHIRIFE, J.; RESNIK, S.L.
Filiación:Depto. de Industrias, Facultad de Ciencias Exactas y Naturales, Univ. de Buenos Aires, Buenos Aires, 1428, Argentina
Buenos Aires, Argentina
Año:1984
Volumen:49
Número:6
Página de inicio:1486
Página de fin:1488
DOI: http://dx.doi.org/10.1111/j.1365-2621.1984.tb12827.x
Título revista:Journal of Food Science
Título revista abreviado:J. Food. Sci.
ISSN:00221147
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00221147_v49_n6_p1486_CHIRIFE

Referencias:

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  • Gál, S., Recent development in techniques for obtaining complete sorption isotherms. (1981) Water Activity: Influences on Food Quality, p. 89. , L.B. Rockland, G.F. Stewart, Academic Press,. London, New York
  • Gibbard, H.F., Jr., Scatchard, G., Rousseau, R.A., Creek, J.L., Liquid‐vapor equilibrium of aqueous sodium chloride from 298 to 373 K and from 1 to 6 mol kg ‐1 , and related properties (1974) J. Chem. and Engng. Data, 19 (281)
  • Greenspan, L., Humidity fixed points of binary saturated aqueous solutions (1977) J. Res., Nat. Bur. Std. -A, Phys. Chem, 81 A, p. 89
  • Hamer, W.J., Wu, Y.C., Osmotic coefficients and mgan activity coefficients of unl‐univalent electrolytes in water at 25°C (1972) Journal of Physical and Chemical Reference Data, 1 (1047)
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  • Scatchard, G., Hamer, W.J., Wood, S.E., Isotonic solutions (1938) 1. The chemical potential of water in aqueous solutions of sodium chloride. potassium chloride. sulfuric acid. sucrose. urea and glycerol at 25°C. J. Amer. Chem. Soc., 60 (3061)
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Citas:

---------- APA ----------
CHIRIFE, J. & RESNIK, S.L. (1984) . Unsaturated Solutions of Sodium Chloride as Reference Sources of Water Activity at Various Temperatures. Journal of Food Science, 49(6), 1486-1488.
http://dx.doi.org/10.1111/j.1365-2621.1984.tb12827.x
---------- CHICAGO ----------
CHIRIFE, J., RESNIK, S.L. "Unsaturated Solutions of Sodium Chloride as Reference Sources of Water Activity at Various Temperatures" . Journal of Food Science 49, no. 6 (1984) : 1486-1488.
http://dx.doi.org/10.1111/j.1365-2621.1984.tb12827.x
---------- MLA ----------
CHIRIFE, J., RESNIK, S.L. "Unsaturated Solutions of Sodium Chloride as Reference Sources of Water Activity at Various Temperatures" . Journal of Food Science, vol. 49, no. 6, 1984, pp. 1486-1488.
http://dx.doi.org/10.1111/j.1365-2621.1984.tb12827.x
---------- VANCOUVER ----------
CHIRIFE, J., RESNIK, S.L. Unsaturated Solutions of Sodium Chloride as Reference Sources of Water Activity at Various Temperatures. J. Food. Sci. 1984;49(6):1486-1488.
http://dx.doi.org/10.1111/j.1365-2621.1984.tb12827.x