New procedure for determining the solubility of lypophilic nonionlic surfactants in waterстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The procedure that allows to study the kinetics of a dissolution of oleophilic nonionic surfactants in water and to determine the equilibrium values of solubility (Sw)was proposed, based on the spectrophotometry of extremely dilute, finely dispersed o/w emulsions of these substances prepared by sonication. The equilibrium values of solubility of tetraethoxylated p-nonylphenol (Neonol AF4) and sorbitan monolaurate (Span 20) at 293 K in water are 3.67x10(-5) and 1.03x10(-5) M, respectively. For the tetraethoxylated p-nonylphenol, the equilibrium value of solubility in water determined by the proposed procedure agrees well with that determined by precision tensiometric measurements