FIELD: study of chemical and physical properties of substances, specifically, X-ray spectrometric analysis of ore after its acidic decomposition and extraction of determined elements. SUBSTANCE: process consists in pouring of solution from cellulose filter on backing and in its drying. Substrate is placed on bottom of fluoroplastic barrel which internal space has form of turned over truncated cone with angle of 40 to 50 deg included between generating line and height. Backing has diameter equal to diameter of lower base of cone. Solution is dried at temperature that does not exceed boiling point of solution and melting point of fluoroplastic. EFFECT: expanded application field, increased precision and reduced time of process. 1 dwg, 1 tbl
