Selective Retention Properties to Silver(I) and Mercury(II) Ions of Poly(4-vinylpyridine) Methyl Iodide Studied by the Liquid-Phase Polymer-Based Retention Technique

摘要

The retention of various metal ions by water-soluble poly(4-vinylpyridine) methyl iodide in conjunction with ultrafiltration membrane was investigated. The method is based on the retention of inorgaic ions by this polymer in a membrane filtration cell and subsequent separation of low-molecular weight species from the polymer cell and subsequent separation of low-molecular weight species from the polymer metal ion comlex formed. It is shown that the polychelatogen can bind silver(I) and mercury(II) ions in aqueous solution at pH 1. At higher pH, the water-soluble polymer can be applied to the separation and preconcentration of silver metal ions. Therefore, this polychelatogen is highly selective to Hg(II) at pH 1 with respect to metal ions such as Cd(II) and Zn(II).