Study on Preconcentration Methods for the Determination of Trace Elements

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(1) Synergistic extraction system, dithizone-TOPO, was applied to preconcentration of Cu(II). Synergistic extraction of RE elements using TTA and 1,10-phenanthroline was found to improve not only separation factor but extraction efficiency. The online extraction system was developed for ICP analysis of trace metals. Extraction with chelating-agents mixture was used for simultaneous multi-elements extraction.(2) Bio-Rad AG 1 resin was used for preconcentration of U and Mo from seawater. The series of chelating resins was developed and applied to enrich the rare metals. MBT/SG and thionalide/SG were used for concentration of Ag and Sb, resevtively. Poly(chlorotrifluoroethylene) was found te adsorb many metal complexes and applied to speciation and preconcentration of trace metals in natural waters. "EXPAPIERF-2" was used for enrichment of Th, Zr, Fe, Sc, Y,Ga and RE elements.(3) Metal preconcentration by molecular bilayer assemblies was studied.(4) Amberlite XAD-2 resin treated with In(III) was used for preconcentration of humic complexes and coprecipitation-flotation technique was developed to measure the molecular weight distribution and adsorption ability of humic acid.(5) Metal concentration with non-aqueous isotachophoresis was studied for separation of heavy metal ions after extraction of the DDTC chelates into nitrobenzene.