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聚乙烯吡咯烷酮（ＰＶＰ）水溶液在不同盐存在下可分成聚合物固相和盐水相。研究了分相条件和水溶性螫合剂及金属离子螫合物在该体系两相间的分配行为。用偶氮胂Ｍ作萃取剂，实现了错（Ⅳ）－钪（Ⅲ），铀（Ⅵ）－铁（Ⅲ），铁（Ⅲ）－钪（Ⅲ）的定量萃取分离，探讨了ＰＶＰ相的萃取机理。
An aqueous solution of polyvinylpyrrolidone (PVP) can be separated into a polymer solid phase and a brine phase in the presence of different salts. The partitioning conditions and the distribution behavior of water-soluble chelating agent and metal ion chelate in the system were studied. Arsenazo M was used as the extractant to achieve the quantitative extraction and separation of the scandium (Ⅲ), uranium (Ⅵ) -iron (Ⅲ) and iron (Ⅲ) Extraction mechanism.