The Partial Molal Volumes and Compressibilities of Nonelectrolytes and Amino Acids in 0.725 m NaCl
Tóm tắt
The partial molal volumes and compressibilities of a number of nonelectrolytes and amino acids in 0.725 m NaCl have been determined from density and compressibility measurements. The results have been used to examine the behavior of these compounds in ocean waters. The partial molal volumes of the solutes in 0.725 m NaCl were a linear function of the values in water. The partial molal compressibilities of urea, sugars and amino acids were all negative due to the hydration of water molecules. The values of partial molal compressibilities in 0.725 m NaCl were not as negative due to the decrease in the hydration in the salt solution. A simple hydration model is used to estimate the number of water molecules hydrated to the solutes in 0.725 m NaCl. The partial molal volumes and compressibilities for the nonelectrolytes determined in this study should be useful in estimating the effect of pressure on equilibrium reactions of these compounds in seawater.
Tài liệu tham khảo
Lo Surdo A, Shin C, Millero FJ (1978) The apparent molal volume and adiabatic compressibility of some organic solutes in water at 25 °C. J Chem Eng Data 23(3):197–201
Millero FJ (1980) Review of the experimental and analytical methods for the determination of the pressure–volume–temperature properties of electrolytes, chapter 31. In: Newman SA (ed) Thermodynamics of aqueous systems with industrial applications. ACS symposium series 133, American Chemical Society, Washington, DC, pp 581–622
Millero FJ (1982) The effect of pressure on the solubility of minerals in water and seawater. Geochim Cosmochim Acta 46:11–22
Millero FJ (1983) Influence of pressure on chemical processes in the sea. In: Riley JP, Chester R (eds) Chemical oceanography, 2nd edn. Academic Press, New York, pp 1–88
Millero FJ, Huang F (2013) The partial molal volume and compressibility of salts in seawater. Geochim Cosmochim Acta 104:19–28
Millero FJ, Kubinski T (1975) Speed of sound in seawater as a function of temperature and salinity at one atmosphere. J Acoust Soc Am 57:312–319
Millero FJ, LoSurdo A, Shin C (1978) The apparent molal volumes and adiabatic compressibilities of aqueous amino acids at 25 °C. J Phys Chem 82(7):784–792