Comparison of vapour pressure osmometry, freezing point osmometry and direct membrane osmometry for determining the osmotic pressure of concentrated solutions

Madden, McKenzie J.; Ellis, Sarah N.; Riabtseva, Anna; Wilson, Aaron D.; Cunningham, Michael F.; Jessop, Philip G.

doi:10.1016/j.desal.2022.115946

Comparison of vapour pressure osmometry, freezing point osmometry and direct membrane osmometry for determining the osmotic pressure of concentrated solutions

Journal Article · Thu Jul 21 00:00:00 EDT 2022 · Desalination

DOI:https://doi.org/10.1016/j.desal.2022.115946· OSTI ID:2006587

Madden, McKenzie J. ^[1]; Ellis, Sarah N. ^[1]; Riabtseva, Anna ^[1]; Wilson, Aaron D. ^[2]; Cunningham, Michael F. ^[1]; Jessop, Philip G. ^[1]

Queen's University, Kingston (Canada)
Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Osmometry is the analytical method of measuring osmotic pressure ($$π$$) and related colligative properties. Accurately measuring $$π$$ is essential for applications that use osmosis, including drug delivery systems and water filtration methods such as forward osmosis. The three most common forms of directly or indirectly measuring $$π$$ are vapour pressure osmometry (VPO), freezing point osmometry (FPO), and direct membrane osmometry (DMO). In this report, the performance of VPO, FPO, and DMO are compared for various aqueous solutions, including small molecule and polymer solutes, and potentially more difficult samples such as concentrated, carbonated, or viscous solutions. Furthermore, potential problems with each of the three methods are examined. Good practices can avoid inaccuracies in DMO due to external concentration polarization and solute diffusion through the membrane. Similarly, it is important to be aware of and avoid weaknesses in VPO and FPO in order to obtain reliable results. Even with care, however, the three methods still give different values of $$π$$ for concentrated aqueous solutions.

View Accepted Manuscript (DOE)

Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: Natural Sciences and Engineering Research Council of Canada (NSERC); USDOE

Grant/Contract Number:: AC07-05ID14517

OSTI ID:: 2006587

Report Number(s):: INL/JOU--22-68767-Rev000

Journal Information:: Desalination, Journal Name: Desalination Vol. 539; ISSN 0011-9164

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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