The Enrichment of Trace Cadmium by Liquid Membrane and It''s Determination by Flame Atomic Absorption Spectrometry
液膜富集火焰原子吸收法测定水中痕量镉

In this paper, the selective preconcentration of trace of cadmium by liquid membrane is studied and the best conditions for enriching trace cadmium reported. The liquid membrane composed of span80-P204-kerosene-HCl is found to be more effective. The demulsification of the emulsion phase after extraction is carried. out by a heat demulsification technique. The emulsion swelling is examined. Cd2+ at×10-9 level can be enriched and determined by FAAS. A recovery of more than 97% and a enrichment of over 80-fold are obtained for Cd2+. The results was satisfied.