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本文讨论了聚合物—盐—有机试剂双水相体系的特点和研究现状，概述了该体系用于萃取分离金属离子的进展状况，提出了这种体系需进一步解决的问题。
In this paper, the characteristics and research status of the polymer-salt-organic reagent aqueous two-phase system are discussed. The progress of the system for the extraction and separation of metal ions is summarized. Some problems to be solved by the system are also proposed.