A comparison of gas-liquid separators for the determination of mercury by cold-vapour sequential injection atomic absorption spectrometry

摘要

Four different designs of gas-liquid separators were compared for the determination of mercury by cold-vapour generation atomic absorption spectrometry using the sequential injection technique for mixing the reacting solutions. Two atom cells were also compared, one with windows and one without. The results indicate that the use of a "detuned" nebulizer gave the poorest results. Similar results were obtained with a home-made separator based on a frit and a Perkin-Elmer FIAS Chemifold system with a small dead volume. The use of an atom cell with windows provided the best signals for the determination of mercury.