A COMPUTER-PROGRAM RELATING SOLUTE POTENTIAL TO SOLUTION COMPOSITION FOR 5 SOLUTES

Data required to prepare solutions with desired solute potentials at any temperature from 0 to 40 degrees C are scattered, often have inappropriate units, and usually require involved calculation or are not available. We wished to prepare a program so that anyone could obtain pertinent information simply. Adequate published data could be found only for mannitol, PEG 8000, NaCl, KCl, and sucrose, with water displacement by mannitol and PEG 8000 having to be measured. The program sends tabular output to the screen and it may be written in a disk file, making observation of relationships and preparation of graphical representation simple. A sequence of data may be generated over temperature, concentration, or potential ranges by specifying an initial value, interval size, and number of intervals. Values are given for temperature, water density, molal and molar concentrations, g solute g(-1) water osmotic coefficient, g and mL water displaced g(-1) solute, solute potential (MPa), and g solute and g water needed for a requested volume of solution.