The Extraction of Noble Metals by Macrocyclic Compounds: II. The Extraction by Crown Compounds

摘要

Our review on the extraction of noble metals by macrocyclic compounds, i.e., by crown ethers containing donor atoms O, S, and N, continues. The literary data for the period from 1984 to 2008 are summarized. It is noted that no systematic investigations have been carried out until now. On the whole, the information is incomplete. The solution compositions are far from technological ones, and the chemical state of extracted ions in aqueous solutions is not taken into account. It is emphasized that there is only desultory information on the reextraction in the literature. The problem of selectivity for noble metal extraction by crown compounds is discussed.