聚乙烯吡咯啉酮-(NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub>-H<sub>2</sub>O液-液、液-固萃取体系

The Liquid-Liquid and Liquid-Solid Extraction System of Polyvinyl Pyrrodidone- (NH₄)₂SO₄-H₂O

Li Buhai, Wang Kefu

Chem. J. Chinese Universities . 1990, (4): 336 -339 .