摘要：For the rapid determination of SeH2, several granular gels which change colors when exposed to air containing small amount of SeH2 were investigated. Purified silica gel impregnated with gold chloride was found to be a most sensitive and stable reagent for SeH2. The gel was placed in a glass tubing and the sample air was drawn through the tube with constant flow rate, and the quantitative estimation was possible by measuring the length of colored zone. The mean relative error was within 5%. The measurable range were as follows : (1) SeH2 : 10-600 ppm when sample volume was 100 ml, and feeding time 3 min. (2) SeH2 : 1-100 ppm when sample volume was 500 ml, and feeding time 15 min.
