An improved isopiestic method for measurement of water activities in aqueous polymer and salt solutions

作者：Lin DQ; Mei LH; Zhu ZQ; Han ZX

来源：Fluid Phase Equilibria, 1996, 118(2): 241-248.

DOI：10.1016/0378-3812(95)02853-6

• experiments
• method
• activity
• polymers
• electrolytes
• water

The isopiestic method was described, and its advantages and disadvantages were discussed. A nine-legged glass apparatus was developed and the experimental procedure was improved. The time for equilibration was greatly reduced to 3 or 4 d, even for the high viscous solutions. The average relative error in the observed water activities for standard electrolyte solution was +/-0.01%. The water activities of PEG1000 + H2O, PEG4000 + H2O, PEG + MgSO4 + H2O and PEG + (NH4)(2)SO4 systems were measured at 25 degrees C.

• 出版日期1996-4-30
• 单位浙江大学