In the presence of (NH4)2SO4, the aqueous solution of Polyvinyl Pyrrolidone can form a pol- ymeric solid phase and a salt aqueous phase. The distribution of Cu(II), Pb(II), Cd(II) and Cr(II) be- tween the two phases is examined with pyrocatechol violet as extractant. The effect of the solution acid- ity, the amount of the extractant and the (NH4) 2SO4 concentration on the degree of extraction rate of metal ions is investigated. The quantitative extraction separation and determination of Cu(II)--Cr(II) is accomplished by properly adjusting the acidity of the solution.%在一定浓度硫酸铵存在的条件下,聚乙烯吡咯烷酮(PVP)水溶液能形成盐水相与聚合物固相。实验研究了Cu(Ⅱ)、Pb(Ⅱ)、Cd(Ⅱ)、Cr(Ⅱ)与邻苯二酚紫(PV)形成的配合物在聚乙烯吡咯烷酮盐水萃取体系液固两相中的分配行为。探讨萃取酸度、硫酸铵浓度和萃取剂用量等条件对金属离子萃取率的影响,通过控制一定的条件实现Cr(Ⅱ)与Cu(Ⅱ)的定量萃取分离。
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机译:<![CDATA [PB <下标> 1- <重点类型=“斜体”> x forphasis> subscript> ag <重点类型=“斜体”> x / 重点> 下标> s和pb <下标> 1- <重点类型=“斜体”> x fephasis> subscript> cu x subscript> s(0≤ x 强调>≤0.011)固溶液]]]>