title: [Evaluation of the vant'Hoff's osmotic coefficient in concentration polarization conditions of membrane system].
abstract: In this paper the method of evaluation the value of osmotic vant't Hoff's coefficient (f) in membrane system, which is based on the original equation of third degree for the coefficient f was elaborated. This equation, obtained on the basis of Kedem-Katchalsky equation, contains the transport parameters of membrane (Lp, sigma, omega), solution concentration (C), volume flux (Jvm), thickness of concentration boundary layer (delta), etc. These parameters can be determined in a series of independent experiments. The calculation performed for the solution of ammonia in aqueous solution of KCl and polymer membranes show that, the value of coefficient f fulfill the condition 1 < or = f < or = 2 and that there is a range of concentrations of ammonia, in which the changes f occur nonmonitically
authors.affiliation: Katedra Zdrowia Publicznego Politechnika Czestochowska
authors.forename: Jolanta
authors.initials: J
authors.lastname: Jasik-Slezak
authors.forename: Kornelia
authors.initials: K
authors.lastname: Olszówka
authors.forename: Andrzej
authors.initials: A
authors.lastname: Slezak
mesh_terms: D000641:Ammonia / Q000737:chemistry; D008567:Membranes, Artificial; D008956:Models, Chemical; D009995:Osmosis; D011108:Polymers / Q000737:chemistry; D012996:Solutions / Q000737:chemistry
chemical_list: D008567:Membranes, Artificial; D011108:Polymers; D012996:Solutions; D000641:Ammonia