A method for the determination of diffusivities in liquids is described; the method is based on measurements of the response to injection in a laminar flow of liquid in a capillary. By injection of s-type, the component whose diffusivity is to be measured is introduced into the inlet part of a capillary of internal diameter 1.6 mm. The response to the injection is measured at the end of the capillary by a flow-through refractometer, the output signal of which is recorded on tape at 16-s intervals. The output signal is compared with a theroetical model of the time dependence of the response, based on Taylor's analysis of the dispersion of an injected component in laminar flow. The diffusivity is calculated from one of the model parameters, which were evaluated by the method of maximum likelihood. The calibration of the instrument was performed by measuring the diffusivity of KCl in aqueous solution.The following diffusivities at 25°C were determined: n-butanoI971 jJ.m'/s, dioxane 1093"m'/s, caprolactarne 948 jJ.m'/s, Na,SO. 1126 jJ.m'/s, salicylaldoxime 895 "m'/s, cyelohexanone 960 jJ.m'/s, acetone 1316 jJ.m'/s, oxine 820.5 "m'/s, all in water; caprolactarne in trichlorethylene 1958 jJ.m'/s, caprolactarne in 10% aqueous (NH.),SO. solution 1148 jJ.m'/s, salicylaldoxime in chloroform 1878jJ.m'/s.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.