FIELD: measuring equipment.
SUBSTANCE: invention relates to measurement equipment and can be used in investigation of mass transfer processes and for determination of diffusion coefficients of solvents in products from capillary-porous materials in construction materials and structures, as well as in food, chemical and other industries. Method for determining diffusion coefficient of solvents in solid articles from capillary-porous materials consists in creating in the article of interest a uniform initial content of a solvent distributed in a solid phase, bringing the flat surface of the article into contact with a pulse point source of the solvent, waterproofing said surface, placing electrodes of the galvanic converter on said surface along a concentric circle relative to the point of pulse action, recording two moments of time τ1 and τ2, at which equal values of galvanic converter signal are achieved before and after moment of maximum signal of converter, and calculation of diffusion coefficient, wherein pulse action is carried out with a dose of solvent calculated by formula: Q≈3.9ρ0Upr03, and time moments τ1 and τ2 fixed when equal galvanic converter signal values are achieved in vicinity of 0.9 Ep value, where r0 is the distance between the electrodes of the galvanic converter and the point of exposure of the solvent to the surface of the inspected article; ρ0 is density of analyzed sample in dry state; Up is the equilibrium concentration of the solvent in the analyzed sample upon contact with saturated solvent vapor at a given temperature; Ep is galvanic converter signal value at concentration Up.
EFFECT: higher accuracy of control and reduced time and costs for research.
1 cl, 1 dwg, 1 tbl
