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Ultrasonic Studies of Aqueous Solutions of L-Alanine and L-Serine

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Densities and ultrasonic velocities of aqueous solutions of L-Alanine and L-Serine over a wide range of concentrations (0.12 to 1.5 m) and temperatures (15 to 50 °C) have been measured. These data have been used for the calculation of various parameters like adiabatic compressibility (β), intermolecular free length (L f), apparent molal volume (Øν), apparent molal compressibility (Øk(s)), molar sound velocity (R), molar adiabatic compressibility (W) and hydration number (n H). All these parameters are found to be temperature and concentration dependent. Our experimental results of Øo ν and Øo k(s) are in agreement with those reported by Millero and others.


Die Dichten und Ultraschallgeschwindigkeiten wäßriger Lösungen von L-Alanin und L-Serin wurden über einen weiten Bereich der Konzentration (0,12 bis 1,5 m) und Temperatur (15° bis 50 °C) gemessen. Diese Daten wurden für die Berechnung verschiedener Parameter, wie der adiabatischen Kompressibilität β, der intermolekularen freien Lénge L f, dem scheinbaren Molvolumen Øν, der scheinbaren molaren Kompressibilität Øk(s), der molaren Schallgeschwindigkeit R, der molaren adiabatischen Kompressibilität W und der Hydratationszahl n H benutzt. All diese Parameter erwiesen sich als temperaturund konzentrationsabhängig. Die vorliegenden experimentellen Ergebnisse von Ø0 ν und Øk(s) 0 stimmen mit den von Millero und anderen angegebenen überein.


On a procédé à des mesures de densité et de vitesse de propagation des ultrasons dans des solutions aqueuses de L-Alanine et de L-Sérine, sur un intervalle important de concentrations (0,12 à 0,15 m) et de températures (15 à50 °C). Les résultats ont permis le calcul de divers paramèters tels que la compressibilité adiabatique (β), la distance intermoléculaire (L f), le volume molal apparent (Øν), la compressibilité molale apparente (Øk(s)), la compressibilit;amp;#x00E9; adiabatique molaire (W) et le degré d'hydratation (n H). Tous ces paramètres se révèlent être dépendants de la température et de la concentration. Nos résultats expérimentaux de Ø0 ν et Ø0 k(s) sont en accord avec ceux qu'ont publiés Millero et d'autres.
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Document Type: Research Article

Publication date: April 1, 1993

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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