[en] A visual methods of U(6) and Th(4) determination with arsenazo(3) immobilized on the fiber material filled with anion exchanger is proposed. The method makes it possible to determine the total U and Th content and Th content from the single sample using two color scales within the concentration range of 0.02-0.24 mg/liter (total) and 0.01-0.12 mg/liter of Th at their ratio from 1:3 to 3:1. The error of analysis is no more than ±50%