FIELD: analytic chemistry. SUBSTANCE: potentiometer determination of substance concentration in solution of extraction systems is performed by measuring the sudden change of potential in organic phase. Current is removed through water phases contacting organic phase. One of water phases is standard solution, and the other is solution under test. Concentration is determined by means of calibration graph in x coordinates. Sudden change impotential indicates concentration of solution under test. EFFECT: high efficiency. 6 dwg
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