title: Possible time-dependent effect of ions and hydrophilic surfaces on the electrical conductivity of aqueous solutions.
abstract: The purpose of this work was to determine the influence of mechanical and electrical treatment on the electrical conductivity of aqueous solutions. Solutions were treated mechanically by iteration of two steps: 1:100 dilution and vigorous shaking. These two processes were repeated until extremely dilute solutions were obtained. For electrical treatment the solutions were exposed to strong electrical impulses. Effects of mechanical (as well as electrical) treatment could not be demonstrated using electrical conductivity measurements. However, significantly higher conductivity than those of the freshly prepared chemically analogous solutions was found in all aged solutions except for those samples stored frozen. The results surprisingly resemble a previously observed weak gel-like behavior in water stored in closed flasks. We suggest that ions and contact with hydrophilic glass surfaces could be the determinative conditions for the occurrence of this phenomenon.
authors.affiliation: Institute Bion d. o. o., Stegne 21, 1000 Ljubljana, Slovenia.
authors.forename: Nada
authors.initials: N
authors.lastname: Verdel
authors.affiliation: Institute Bion d. o. o., Stegne 21, 1000 Ljubljana, Slovenia.
authors.forename: Igor
authors.initials: I
authors.lastname: Jerman
authors.affiliation: Institute Bion d. o. o., Stegne 21, 1000 Ljubljana, Slovenia.
authors.forename: Rok
authors.initials: R
authors.lastname: Krasovec
authors.affiliation: Department of Chemistry, University of Ljubljana, Aškerčeva 5, 1000 Ljubljana, Slovenia.
authors.forename: Peter
authors.initials: P
authors.lastname: Bukovec
authors.affiliation: Department of Chemistry, University of Ljubljana, Aškerčeva 5, 1000 Ljubljana, Slovenia.
authors.forename: Marija
authors.initials: M
authors.lastname: Zupancic
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry; D004553:Electric Conductivity; D057927:Hydrophobic and Hydrophilic Interactions; D007477:Ions / Q000737:chemistry; D055595:Mechanical Phenomena; D012996:Solutions / Q000737:chemistry*; D014867:Water / Q000737:chemistry* / Q000502:physiology
chemical_list: D007477:Ions; D012996:Solutions; D014867:Water; D002245:Carbon Dioxide