Abstract
In the previous work hollow cathode lamps cooled with water have been designed for arsenic and selenium, which yielded brighter and more stable intensities. A new hollow cathode lamp of arsenic was developed. In this lamp were confined neon and hydrogen gases in a cooled hollow cathode tube, and the hydrogen was allowed to be reacted with arsenic vapor produced by sputtering. The arsenuretted hydrogen became dissociated at high current in hollow cathode, giving a more intense atomic spectrum of arsenic. Another improvement in performance is an increased sensitivity with the new lamp. Carbon tube atomizer employed was a Jarrell-Ash FLA-100. Atomizing temperature was 2560°C. Sensitivity (concentration μg/ml for 1% absorption) of arsenic was as low as 1.1ng/ml (22μg) in carbon tube atomizer.The detection limit was down to 0.2ng/ml (4pg).
