Ultrasonic studies on inorganic fertilizers

In the present study, the ultrasonic velocity of aqueous solutions of ammonium sulphate and diammonium phosphate
fertilizers has been measured in the concentration range of 0.1m to 0.6m at 303◦K. The variation of ultrasonic velocity is not
linear and the non-linearity of this is confirmed by adiabatic compressibility study also. The study was also extended to
aqueous solution of diammonium phosphate in 0.3m ammonium sulphate to study the influence of ammonium sulphate on the
nature of molecular interactions. Using the measured values of ultrasonic velocity, density, viscosity, acoustic parameters like
adiabatic compressibility, intermolecular free length, acoustic impedance, relaxation time, free volume, internal pressure and
solvation number have been evaluated. These parameters are used to discuss the molecular interactions of these compounds
with water molecules