Granular entrapped adsorbents of crown etherphosphotungstic acid (PW) and crown etherphosphomolybdic acid (PMo) in polyacrylamide were prepared by the solgel method and used for the adsorption of various heavy metals ions such as Ag+, Pb2+, Hg2+, Cd2+, Fe3+ and Zn2+. Dibenzo-18-crown-6 -PW (or -PMo)/polyacrylamide adsorbent gave high adsorption and a high selectivity for large metal ions such as Ag+, Pb2+ and Hg2+, but not for smaller ions. In contrast, small heavy metal ions such as Cu2+, Fe3+ and Zn2+, but not larger ions, were strongly adsorbed by 12-crown-4 -PW (or -PMo)/polyacrylamide adsorbent. The effects of pH and solvents on the adsorption were investigated. A dibenzo-18-crown-6 -PMo adsorbent film was also prepared and successfully applied to the selective adsorption of Ag+ ions from an aqueous solution containing various metal ions, and the Ag+ ions on the film could be determined quantitatively by X-ray fluorescence analysis.
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