Molecular imprinting science and technology: a survey of the literature for the years up to and including 2003

Preconcentration techniques for uranium(VI) and thorium(IV) prior to analytical determination-an overview.

Metal ion-imprinted polymers : Novel materials for selective recognition of inorganics

The development of new enrichment techniques and selective separation of closely related metals are two important frontier areas of research in analytical chemistry. Solid-phase extraction (SPE) or solid-liquid extraction (SLE) offers several advantages over other preconcentration or separation techniques. The introduction of ion-imprinted polymers (IIPs) in trace and ultratrace analysis provide vital breakthroughs in preconcentration or separation chemistry. The combination of the above two approaches results in IIPs for SPE (IIP-SPE) and has potential in trace and ultratrace analysis. With the preparation of tailor-made materials, IIP-SPE offers an approach to the recovery of valuable and rare metals from lean ores, minerals and dilute solutions and to the removal of toxic uranium and heavy metal pollutants from industrial wastes. This article takes stock of studies so far and outlines a future scenario in the rapidly developing and exciting area of IIP-SPE.

Tailored materials for preconcentration or separation of metals by ion-imprinted polymers for solid-phase extraction (IIP-SPE)

The combination of molecularly imprinted polymers (MIPs) and solid phase extraction (SPE) is reviewed. MIPs, which have high selectivity and affinity for a predetermined molecule (template), have been used as sorbents for SPE to selectively isolate analytes from biological, pharmaceutical, and environmental samples. Solid phase extraction with molecularly imprinted polymers (MIP–SPE) is a promising technique which allows specific analytes to be selectively extracted from complex matrices. This survey summarizes the characteristics, development and application of MIP–SPE in recent years. Existed problems and the future direction of MIP–SPE are also discussed.

Molecularly Imprinted Polymers for Solid Phase Extraction

Uranyl ion imprinted polymer particles were prepared by the copolymerization of styrene monomer and a crosslinking agent divinyl benzene in the presence of -5,7-dichloroquinoline-8-ol-4-vinyl pyridine ternary complex as template where in is the imprint ion in presence of 2,2′-azo-bis-isobutyronitrile as initiator. The Uranyl ion was removed from the polymer particles by leaching with 1:1 HCl, which leaves cavities in the polymer particles. The leached polymer particles preconcentrate ion from dilute aqueous and synthetic seawater solutions. Further, these particles find use in the separation of ion from various bivalent, trivalent, and tetravalent, inorganic ions. The accuracy of the developed enrichment procedure was tested by analyzing marine sediment certified reference material supplied by National Research Council (NRC), Canada. Further, the developed procedure has been successfully employed to analyze real soil and sediment samples.

Talasila Prasada Rao

Papers

Synthesis and Analytical Applications of Uranyl Ion Imprinted Polymer Particles