Synthesis And Efficiency Of A Spherical Macroporous Epoxy-Polyamide Chelating Resin For Preconcentrating And Separating Trace Noble Metal Ions

摘要

The determination of noble metals in various materials usually requires their preconcentration and separation from other elements.In spite of the improvements in analytical instrumentation and the development of new analytical techniques such as ICP-MS,which are capable of detecting metal ions at ppt levels,the interference caused by the sample matrix still exists and is perhaps the most serious problem ,making a pre-determination enrichment step necessary .Thus,the search for efficient preconcentration and separation methods is essential.A series of chelating resins that can selectively adsorb noble metal ions from aqueous solutions have been described.Functional groups,such as salicylaldoxime and thiosemicarbazide have been incorporated in cross-linked polymers or porous silica gel.These resins have very high selectivity for one or several types of noble metal ion.However,desorption of noble metals from these resins is usually difficult.Hence,the development of an adsorbent from which noble metals can be easily desorbed is needed.