“…A system for complete qualitative analysis on a single drop, based on the combination of ring oven, cation exchange paper, and emission spectrog-raphy, was suggested (115) and a semiquantitative autoradiographic determination of radio isotopes was proposed (165). The ring oven was suggested also for the study of dilute radioactive solutions (103) and, with appropriate spot tests, was applied in the detection of aluminum (104), uranium (106), various elements released from organic compounds (109), and in the detection and estimation of antimony (169) and beryllium (173) isolated from airborne particulate samples.…”