硝酸铵-丁二酮肟-百里酚酞体系分离富集镍(Ⅱ)  

Separation and enrichment of nickel(Ⅱ) with ammonium nitratediacetydioxime-thymolphthalein system

作　　者：涂常青[1] 李雯霞[1] 温欣荣[1] 丘苑红 李敏穗 陈毅平[1] 

机构地区：[1]嘉应学院化学与环境学院,广东梅州514015

出　　处：《冶金分析》2014年第3期77-80,共4页Metallurgical Analysis

基　　金：广东省自然科学基金项目(S2012010010978);嘉应学院第十批教育教学改革研究项目(JYJG2013102)

摘　　要：建立了一种以微晶百里酚酞作吸附剂分离富集镍㈣的新方法。探讨了分离富集镍（Ⅱ）的行为及其与常见离子定量分离的条件，详细讨论了Ni抖的富集机理。结果表明，控制PH8．0，在硝酸铵一丁二酮肟一百里酚酞体系中，镍（Ⅱ）与丁二酮肟（DMG）形成的螯合物沉淀[Ni（DMG）2]可被定量吸附至微晶百里酚酞表面上，形成界面清晰的液一固两相，而锰（Ⅱ）、铜（Ⅱ）、镉（Ⅱ）、铝㈣、锌（Ⅱ）等不被吸附，实现了镍㈣与这些金属离子的定量分离，据此建立了分离富集镍（Ⅱ）的新方法。方法成功用于合成水样中微量镍（Ⅱ）的定量分离，富集率为95．9％～106．5％。A novel method for separation and enrichment of nickel （Ⅱ） was established with microcrys- talline thymolphthalein as adsorbent. The separation and enrichment behaviors of nickel （Ⅱ） and the conditions for its quantitative separation from common ions were explored. The enrichment mecha- nism of Ni2＋ was discussed in detail. The results showed that at pH 8.0, in ammonium nitrate-di- acetydioxime（DMG）-thymolphthalein（TP） system, the chelate precipitate [Ni（DMG）2] formed with nickel （Ⅱ） and DMG could be quantitatively adsorbed on the the surface of microcrystalline thymol- phthalein to form liquid and solid phases with a clear interface, while manganese （Ⅱ）, copper （Ⅱ）, cad- mium （Ⅱ）, aluminum （Ⅲ） and zinc （Ⅱ） could not be adsorbed, achieving the quantitative separation of nickel （Ⅱ） from these metal ions. Thus, a novel method for the separation and enrichment of nickel （Ⅱ） was established. The method was successfully applied to the quantitative separation of micro nickel （Ⅱ） in synthetic water samples with enrichment yield of 95.9 %-106.5 %.

关 键 词：镍(Ⅱ) 分离富集 丁二酮肟 微晶百里酚酞 

分 类 号：O652.6[理学—分析化学]