METHOD TO MEASURE WEIGHT CONCENTRATION OF CLAY IN SAMPLE OF POROUS MATERIAL Russian patent published in 2014 - IPC G01N23/223 G01N9/24 

FIELD: measurement equipment.

SUBSTANCE: to determine weight concentration of clay in a sample of a porous material they select a water-soluble salt of metal that undergoes a selective ion-exchange reaction with clay, with the general formula R⁺M^-, where the metal R⁺ is selected from the group {Ba²⁺; Sr²⁺; Tl⁺; Rb⁺…}, M^- is selected from the group {Cl_n; NO_n; OH_n; CH₃COO, SO₄;…} in accordance with the table of solubility of inorganic substances in water. Clay is marked by mixing of clay with an aqueous solution of selected metal salt, remains of the metal salt that have not reacted with clay are removed. Roentgen-fluorescent spectrometry of marked clay and sample are carried out, and content of the metal is determined in the marked clay, as well as natural content of the metal in the sample. The aqueous solution of the marked clay is pumped through the sample, the sample is dried, and roentgen-fluorescent spectrometry of the entire sample or its separate segments is carried out. They determine the content of the metal in the sample or in each segment and calculate weight concentration of clay retained in the sample or in each of its segments.

EFFECT: provision of the possibility to measure low weight concentration of clay that penetrated pore space of a sample in process of injection of a clay-containing solution.

4 cl, 1 dwg